NIIT Lab: January 2016

Saturday 30 January 2016

Java _Network Files

Programmers Files :-

1. SimpleClient

Ans

public class TestThread {
public static void main(String args[]) {
Xyz r = new Xyz();
Thread t = new Thread(r);
t.start();
}
}

class Xyz implements Runnable {
int i;

public void run() {
i = 0;

while (true) {
System.out.println("Hello " + i++);
if ( i == 50 ) {
break;
}
}
}
}

2. SimpleServer

Ans

import java.net.*;
import java.io.*;

public class SimpleServer {
public static void main(String args[]) {
ServerSocket s = null;

// Register your service on port 5432
try {
s = new ServerSocket(5432);
} catch (IOException e) {
e.printStackTrace();
}

// Run the listen/accept loop forever
while (true) {
try {
// Wait here and listen for a connection
Socket s1 = s.accept();
System.out.println("Connection accepted: port=" + s1.getPort());

// Get output stream associated with the socket
OutputStream s1out = s1.getOutputStream();
BufferedWriter bw = new BufferedWriter(
new OutputStreamWriter(s1out));

// Send your string!
bw.write("Hello Net World!\n");

// Close the connection, but not the server socket
bw.close();
s1.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}

Code Files :- https://drive.google.com/open?id=0B08RKBSts8D8eFh6aVdkS0o4NzQ

Java _ threads Files

Programmers Files :-

1. Sync File :-https://drive.google.com/open?id=0B08RKBSts8D8aFB2cVVlVFIzTlk

*1 .ControlledThread

Ans

public class ControlledThread extends Thread {
static final int SUSP = 1;
static final int STOP = 2;
static final int RUN = 0;
private int state = RUN;

public synchronized void setState(int s) {
state = s;
if ( s == RUN ) {
notify();
}
}

public synchronized boolean checkState() {
while ( state == SUSP ) {
try {
wait();
} catch (InterruptedException e) {
// ignore
}
}
if ( state == STOP ) {
return false;
}
return true;
}

public void run() {
while ( true ) {
//doSomething();

// Be sure shared data is in consistent state in
// case the thread is waited or marked for exiting
// from run()
if ( !checkState() ) {
break;
}
}
}
}

*2. MyStack

Ans

public class MyStack {
int idx = 0;
char [] data = new char[6];

public void push(char c) {
data[idx] = c;
idx++;
}

public char pop() {
idx--;
return data[idx];
}
}

*3. TestMyStack

Ans

public class TestMyStack {

public static void main(String args[]) {

MyStack stack = new MyStack();

stack.push('H');

stack.push('i');

System.out.println("Stack is: " + String.copyValueOf(stack.data));

stack.pop();

stack.push('o');

System.out.println("After one pop and another push, Stack is: " +

String.copyValueOf(stack.data));

}

*4. TestThread

Ans

public class TestThread {

public static void main(String args[]) {

Xyz r = new Xyz();

Thread t = new Thread(r);

t.start();

}

class Xyz implements Runnable {

int i;

public void run() {

i = 0;

while (true) {

System.out.println("Hello " + i++);

if ( i == 50 ) {

break;

}

Code Files :- https://drive.google.com/open?id=0B08RKBSts8D8LVZyY3hsU25XZUE

Java _guiapps Files

Programmers Files :-

1. SampleMenu

Ans

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class SampleMenu
implements ActionListener, ItemListener {
private JFrame f;
private JMenuBar mb;
private JMenu m1;
private JMenu m2;
private JMenu m3;
private JMenuItem mi1;
private JMenuItem mi2;
private JMenuItem mi3;
private JMenuItem mi4;
private JCheckBoxMenuItem mi5;

public void go() {
f = new JFrame("Menu");
mb = new JMenuBar();
m1 = new JMenu("File");
m2 = new JMenu("Edit");
m3 = new JMenu("Help");
mb.add(m1);
mb.add(m2);
mb.add(m3);
f.setJMenuBar(mb);

mi1 = new JMenuItem("New");
mi2 = new JMenuItem("Save");
mi3 = new JMenuItem("Load");
mi4 = new JMenuItem("Quit");
mi1.addActionListener(this);
mi2.addActionListener(this);
mi3.addActionListener(this);
mi4.addActionListener(this);
m1.add(mi1);
m1.add(mi2);
m1.add(mi3);
m1.addSeparator();
m1.add(mi4);

mi5 = new JCheckBoxMenuItem("Persistent");
mi5.addItemListener(this);
m1.add(mi5);

f.setSize(200,200);
f.setVisible(true);
}

public void actionPerformed( ActionEvent ae) {
System.out.println("Button \"" +
ae.getActionCommand() + "\" pressed.");

if (ae.getActionCommand().equals("Quit")) {
System.exit(0);
}
}

public void itemStateChanged(ItemEvent ie) {
String state = "deselected";

if (ie.getStateChange() == ItemEvent.SELECTED) {
state = "selected";
}
System.out.println(ie.getItem() + " " + state);
}

public static void main (String args[]) {
SampleMenu sampleMenu = new SampleMenu();
sampleMenu.go();
}
}

2. SampleMenu1

Ans

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class SampleMenu1 {

private JFrame f;

private JMenuBar mb;

public void go() {

f = new JFrame("MenuBar");

mb = new JMenuBar();

f.setJMenuBar(mb);

f.setSize(200,200);

f.setVisible(true);

}

public static void main (String args[]) {

SampleMenu1 sampleMenu = new SampleMenu1();

sampleMenu.go();

}

3. SampleMenu2

Ans

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class SampleMenu2 {

private JFrame f;

private JMenuBar mb;

private JMenu m1;

private JMenu m2;

private JMenu m3;

public void go() {

f = new JFrame("Menu");

mb = new JMenuBar();

m1 = new JMenu("File");

m2 = new JMenu("Edit");

m3 = new JMenu("Help");

mb.add(m1);

mb.add(m2);

mb.add(m3);

f.setJMenuBar(mb);

f.setSize(200,200);

f.setVisible(true);

}

public static void main (String args[]) {

SampleMenu2 sampleMenu = new SampleMenu2();

sampleMenu.go();

}

4. SampleMenu3

Ans

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class SampleMenu3

implements ActionListener, ItemListener {

private JFrame f;

private JMenuBar mb;

private JMenu m1;

private JMenu m2;

private JMenu m3;

private JMenuItem mi1;

private JMenuItem mi2;

private JMenuItem mi3;

private JMenuItem mi4;

public void go() {

f = new JFrame("MenuItem");

mb = new JMenuBar();

m1 = new JMenu("File");

m2 = new JMenu("Edit");

m3 = new JMenu("Help");

mb.add(m1);

mb.add(m2);

mb.add(m3);

f.setJMenuBar(mb);

mi1 = new JMenuItem("New");

mi2 = new JMenuItem("Save");

mi3 = new JMenuItem("Load");

mi4 = new JMenuItem("Quit");

mi1.addActionListener(this);

mi2.addActionListener(this);

mi3.addActionListener(this);

mi4.addActionListener(this);

m1.add(mi1);

m1.add(mi2);

m1.add(mi3);

m1.addSeparator();

m1.add(mi4);

f.setSize(200,200);

f.setVisible(true);

}

public void actionPerformed( ActionEvent ae) {

System.out.println("Button \"" +

ae.getActionCommand() + "\" pressed.");

if (ae.getActionCommand().equals("Quit")) {

System.exit(0);

}

public void itemStateChanged(ItemEvent ie) {

String state = "deselected";

if (ie.getStateChange() == ItemEvent.SELECTED) {

state = "selected";

}

System.out.println(ie.getItem() + " " + state);

}

public static void main (String args[]) {

SampleMenu3 sampleMenu = new SampleMenu3();

sampleMenu.go();

}

5. SampleMenu4

Ans

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class SampleMenu4

implements ActionListener, ItemListener {

private JFrame f;

private JMenuBar mb;

private JMenu m1;

private JMenu m2;

private JMenu m3;

private JMenuItem mi1;

private JMenuItem mi2;

private JMenuItem mi3;

private JMenuItem mi4;

private JCheckBoxMenuItem mi5;

public void go() {

f = new JFrame("CheckboxMenuItem");

mb = new JMenuBar();

m1 = new JMenu("File");

m2 = new JMenu("Edit");

m3 = new JMenu("Help");

mb.add(m1);

mb.add(m2);

mb.add(m3);

f.setJMenuBar(mb);

mi1 = new JMenuItem("New");

mi2 = new JMenuItem("Save");

mi3 = new JMenuItem("Load");

mi4 = new JMenuItem("Quit");

mi1.addActionListener(this);

mi2.addActionListener(this);

mi3.addActionListener(this);

mi4.addActionListener(this);

m1.add(mi1);

m1.add(mi2);

m1.add(mi3);

m1.addSeparator();

m1.add(mi4);

mi5 = new JCheckBoxMenuItem("Persistent");

mi5.addItemListener(this);

m1.add(mi5);

f.setSize(200,200);

f.setVisible(true);

}

public void actionPerformed( ActionEvent ae) {

System.out.println("Button \"" +

ae.getActionCommand() + "\" pressed.");

if (ae.getActionCommand().equals("Quit")) {

System.exit(0);

}

public void itemStateChanged(ItemEvent ie) {

String state = "deselected";

if (ie.getStateChange() == ItemEvent.SELECTED) {

state = "selected";

}

System.out.println(ie.getItem() + " " + state);

}

public static void main (String args[]) {

SampleMenu4 sampleMenu = new SampleMenu4();

sampleMenu.go();

}

6. TestColor

Ans

import java.awt.*;

public class TestColor {

public static void main(String[] args) {

TestColor tester = new TestColor();

tester.launchFrame();

}

TestColor() {}

private void launchFrame() {

Frame f = new Frame();

Button b = new Button("Purple");

Color purple = new Color(255, 0, 255);

b.setBackground(purple);

f.add(b);

f.pack();

f.setVisible(true);

}

7. TestPrinting

Ans

import java.awt.*;

import java.awt.event.*;

public class TestPrinting {

private Frame frame;

private TextArea output;

private TextField input;

public TestPrinting() {

frame = new Frame("Chat Room");

output = new TextArea(10,50);

input = new TextField(50);

}

public void launchFrame() {

Button button;

frame.setLayout(new BorderLayout());

frame.add(output,BorderLayout.WEST);

frame.add(input,BorderLayout.SOUTH);

Panel p1 = new Panel();

// Add Send button

button = new Button("Send");

button.addActionListener(new SendHandler());

p1.add(button);

// Add Print button

button = new Button("Print");

button.addActionListener(new PrintHandler());

p1.add(button);

// Add Quit button

button = new Button("Quit");

// Use an anonymous inner class for variety.

button.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

System.exit(0);

}

});

p1.add(button);

frame.add(p1,BorderLayout.CENTER);

// Attach listener to the appropriate components

frame.addWindowListener(new CloseHandler());

input.addActionListener(new InputHandler());

frame.setSize(440,210);

frame.setVisible(true);

}

private void copyText() {

String text = input.getText();

output.setText(output.getText()+text+"\n");

input.setText("");

}

private class SendHandler implements ActionListener {

public void actionPerformed(ActionEvent e) {

copyText();

}

private class PrintHandler implements ActionListener {

public void actionPerformed(ActionEvent e) {

Toolkit toolkit = frame.getToolkit();

PrintJob job = toolkit.getPrintJob(frame, "Print the Chat Room", null);

Graphics g = job.getGraphics();

frame.print(g);

g.dispose();

job.end();

}

private class CloseHandler extends WindowAdapter {

public void windowClosing(WindowEvent e) {

System.exit(0);

}

private class InputHandler implements ActionListener {

public void actionPerformed(ActionEvent e) {

copyText();

}

public static void main(String[] args) {

TestPrinting c = new TestPrinting();

c.launchFrame();

}

Code File :-https://drive.google.com/open?id=0B08RKBSts8D8WTY2aEJ4ZlEyY1k

Java _events Files

Programmers file

1. ButtonHandler

Ans

import java.awt.event.*;

public class ButtonHandler implements ActionListener {
public void actionPerformed(ActionEvent e) {
System.out.println("Action occurred");
System.out.println("Button's command is: "
+ e.getActionCommand());
}

}

2. MouseClickHandler

Ans

import java.awt.*;
import java.awt.event.*;

public class MouseClickHandler extends MouseAdapter {

// We just need the mouseClick handler, so we use
// the Adapter to avoid having to write all the
// event handler methods

public void mouseClicked (MouseEvent e) {
// Do stuff with the mouse click...
}

}

3. TestAnonymous

Ans

import java.awt.*;

import java.awt.event.*;

public class TestAnonymous {

private Frame f;

private TextField tf;

public TestAnonymous() {

f = new Frame("Anonymous classes example");

tf = new TextField(30);

}

public void launchFrame() {

Label label = new Label("Click and drag the mouse");

// Add components to the frame

f.add(label, BorderLayout.NORTH);

f.add(tf, BorderLayout.SOUTH);

// Add a listener that uses an anonymous class

f.addMouseMotionListener( new MouseMotionAdapter() {

public void mouseDragged(MouseEvent e) {

String s = "Mouse dragging: X = "+ e.getX()

+ " Y = " + e.getY();

tf.setText(s);

}

}); // <- note the closing parenthesis

f.addMouseListener(new MouseClickHandler());

// Size the frame and make it visible

f.setSize(300, 200);

f.setVisible(true);

}

public static void main(String args[]) {

TestAnonymous obj = new TestAnonymous();

obj.launchFrame();

}

4. TestButton

Ans

import java.awt.*;

public class TestButton {

private Frame f;

private Button b;

public TestButton() {

f = new Frame("Test");

b = new Button("Press Me!");

b.setActionCommand("ButtonPressed");

}

public void launchFrame() {

b.addActionListener(new ButtonHandler());

f.add(b,BorderLayout.CENTER);

f.pack();

f.setVisible(true);

}

public static void main(String args[]) {

TestButton guiApp = new TestButton();

guiApp.launchFrame();

}

5. TestInner

Ans

import java.awt.*;

import java.awt.event.*;

public class TestInner {

private Frame f;

private TextField tf;

public TestInner() {

f = new Frame("Inner classes example");

tf = new TextField(30);

}

public void launchFrame() {

Label label = new Label("Click and drag the mouse");

// Add components to the frame

f.add(label, BorderLayout.NORTH);

f.add(tf, BorderLayout.SOUTH);

// Add a listener that uses an Inner class

f.addMouseMotionListener(this.new MyMouseMotionListener());

f.addMouseListener(new MouseClickHandler());

// Size the frame and make it visible

f.setSize(300, 200);

f.setVisible(true);

}

class MyMouseMotionListener extends MouseMotionAdapter {

public void mouseDragged(MouseEvent e) {

String s = "Mouse dragging: X = "+ e.getX()

+ " Y = " + e.getY();

tf.setText(s);

}

public static void main(String args[]) {

TestInner obj = new TestInner();

obj.launchFrame();

}

6. TwoListener

Ans

import java.awt.*;

import java.awt.event.*;

public class TwoListener

implements MouseMotionListener,

MouseListener {

private Frame f;

private TextField tf;

public TwoListener() {

f = new Frame("Two listeners example");

tf = new TextField(30);

}

public void launchFrame() {

Label label = new Label("Click and drag the mouse");

// Add components to the frame

f.add(label, BorderLayout.NORTH);

f.add(tf, BorderLayout.SOUTH);

// Add this object as a listener

f.addMouseMotionListener(this);

f.addMouseListener(this);

// Size the frame and make it visible

f.setSize(300, 200);

f.setVisible(true);

}

// These are MouseMotionListener events

public void mouseDragged(MouseEvent e) {

String s = "Mouse dragging: X = " + e.getX()

+ " Y = " + e.getY();

tf.setText(s);

}

public void mouseEntered(MouseEvent e) {

String s = "The mouse entered";

tf.setText(s);

}

public void mouseExited(MouseEvent e) {

String s = "The mouse has left the building";

tf.setText(s);

}

// Unused MouseMotionListener method.

// All methods of a listener must be present in the

// class even if they are not used.

public void mouseMoved(MouseEvent e) { }

// Unused MouseListener methods.

public void mousePressed(MouseEvent e) { }

public void mouseClicked(MouseEvent e) { }

public void mouseReleased(MouseEvent e) { }

public static void main(String args[]) {

TwoListener two = new TwoListener();

two.launchFrame();

}

Code File :- https://drive.google.com/open?id=0B08RKBSts8D8a3ZMY0h1SkNuNVU

Java _gui File

1. BorderExample

Ans.

import java.awt.*;
import javax.swing.*;

public class BorderExample {
private JFrame f;
private JButton bn, bs, bw, be, bc;

public BorderExample() {
f = new JFrame("Border Layout");
bn = new JButton("Button 1");
bc = new JButton("Button 2");
bw = new JButton("Button 3");
bs = new JButton("Button 4");
be = new JButton("Button 5");
}

public void launchFrame() {
f.add(bn, BorderLayout.NORTH);
f.add(bs, BorderLayout.SOUTH);
f.add(bw, BorderLayout.WEST);
f.add(be, BorderLayout.EAST);
f.add(bc, BorderLayout.CENTER);
f.setSize(400,200);
f.setVisible(true);
}

public static void main(String args[]) {
BorderExample guiWindow2 = new BorderExample();
guiWindow2.launchFrame();
}
}

2. FlowExample

Ans

import java.awt.*;

import javax.swing.*;

public class FlowExample {

private JFrame f;

private JButton b1;

private JButton b2;

private JButton b3;

private JButton b4;

private JButton b5;

public FlowExample() {

f = new JFrame("GUI example");

b1 = new JButton("Button 1");

b2 = new JButton("Button 2");

b3 = new JButton("Button 3");

b4 = new JButton("Button 4");

b5 = new JButton("Button 5");

}

public void launchFrame() {

f.setLayout(new FlowLayout());

f.add(b1);

f.add(b2);

f.add(b3);

f.add(b4);

f.add(b5);

f.pack();

f.setVisible(true);

}

public static void main(String args[]) {

FlowExample guiWindow = new FlowExample();

guiWindow.launchFrame();

}

3. FrameExample

Ans

import java.awt.*;

public class FrameExample {

private Frame f;

public FrameExample() {

f = new Frame("Hello Out There!");

}

public void launchFrame() {

f.setSize(170,170);

f.setBackground(Color.blue);

f.setVisible(true);

}

public static void main(String args[]) {

FrameExample guiWindow = new FrameExample();

guiWindow.launchFrame();

}

4. GridExample

Ans

import java.awt.*;

import javax.swing.*;

public class GridExample {

private JFrame f;

private JButton b1, b2, b3, b4, b5;

public GridExample() {

f = new JFrame("Grid Example");

b1 = new JButton("Button 1");

b2 = new JButton("Button 2");

b3 = new JButton("Button 3");

b4 = new JButton("Button 4");

b5 = new JButton("Button 5");

}

public void launchFrame() {

f.setLayout (new GridLayout(3,2));

f.add(b1);

f.add(b2);

f.add(b3);

f.add(b4);

f.add(b5);

f.pack();

f.setVisible(true);

}

public static void main(String args[]) {

GridExample grid = new GridExample();

grid.launchFrame();

}

5. HelloWorldSwing

Ans

import javax.swing.*;

public class HelloWorldSwing {

private static void createAndShowGUI() {

JFrame frame = new JFrame("HelloWorldSwing");

//Set up the window.

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

JLabel label = new JLabel("Hello World");

// Add Label

frame.add(label);

frame.setSize(300,200);

// Display Window

frame.setVisible(true);}

public static void main(String[] args) {

javax.swing.SwingUtilities.invokeLater(new Runnable() {

//Schedule for the event-dispatching thread:

//creating,showing this app's GUI.

public void run() {createAndShowGUI();}

});

}

Code Files :- https://drive.google.com/open?id=0B08RKBSts8D8M1hQSTZ4RmNNbVk

Friday 29 January 2016

Java Io Function & File Io

Programmers Files :- https://drive.google.com/open?id=0B08RKBSts8D8eGE1bTRfdnl5YmM

Code File :- https://drive.google.com/open?id=0B08RKBSts8D8RVQ1RS0wQ2g4cXM

Sunday 24 January 2016

Java collections

Codes:- https://drive.google.com/open?id=0B08RKBSts8D8a0x0RE84SmY3UEE

Programmes :- https://drive.google.com/open?id=0B08RKBSts8D8aUhoUnVFRlJUNVU

Java code_except

* AddArguments :-

public class AddArguments {
public static void main (String args[]) {
int sum = 0;
for ( String arg : args ) {
sum += Integer.parseInt(arg);
}
System.out.println("Sum = " + sum);
}

}

* AddArguments 2 :-

public class AddArguments2 {

public static void main (String args[]) {

try {

int sum = 0;

for ( String arg : args ) {

sum += Integer.parseInt(arg);

}

System.out.println("Sum = " + sum);

} catch (NumberFormatException nfe) {

System.err.println("One of the command-line "

+ "arguments is not an integer.");

}

* AddArguments 3 :-

public class AddArguments3 {

public static void main (String args[]) {

int sum = 0;

for ( String arg : args ) {

try {

sum += Integer.parseInt(arg);

} catch (NumberFormatException nfe) {

System.err.println("[" + arg + "] is not an integer"

+ " and will not be included in the sum.");

}

System.out.println("Sum = " + sum);

}

* HelloWorld Code :-

public class HelloWorld {

public static void main (String args[]) {

int i = 0;

String greetings [] = {

"Hello world!",

"No, I mean it!",

"HELLO WORLD!!"

};

while (i < 4) {

try {

System.out.println (greetings[i]);

i++;

} catch (ArrayIndexOutOfBoundsException e){

System.out.println("Re-setting Index Value");

i = 0;

} finally {

System.out.println("This is always printed");

}

More Codes :- https://drive.google.com/open?id=0B08RKBSts8D8TE8tMkVxang2eWc

Java Class2

Code :- https://drive.google.com/open?id=0B08RKBSts8D8TktZZ1RoRDBOOFE

Friday 22 January 2016

Java class1

1. Overriding

* Child

public class Child extends Parent {
private void doSomething() {}

}

* Parent

public class Parent {
public void doSomething() {}

}

* UseBoth

public class UseBoth {
public void doOtherThing() {
Parent p1 = new Parent();
Parent p2 = new Child(); // illegal
p1.doSomething();
p2.doSomething();
}

}

2. Codes ID :-

* Employee

public class Employee {

private String name;

private MyDate birthDate;

private float salary;

// Constructor

public Employee(String name, MyDate DoB, float salary) {

this.name = name;

this.birthDate = DoB;

this.salary = salary;

}

public String getDetails() {

return "Name: " + name + "\nSalary: " + salary

+ "\nBirth Date: " + birthDate;

}

* Manager

public class Manager extends Employee {

private String department;

public Manager(String name, MyDate DoB,

float salary, String dept) {

super(name, DoB, salary);

this.department = dept;

}

public String getDetail() {

return super.getDetails() + "\nDepartment: " + department;

}

* MyDate

public class MyDate {

private int day;

private int month;

private int year;

public MyDate(int day, int month, int year) {

this.day = day;

this.month = month;

this.year = year;

}

public boolean equals(Object o) {

boolean result = false;

if ( (o != null) && (o instanceof MyDate) ) {

MyDate d = (MyDate) o;

if ( (day == d.day) && (month == d.month)

&& (year == d.year) ) {

result = true;

}

return result;

}

public int hashCode() {

return (day ^ month ^ year);

}

* TestEquals

public class TestEquals {

public static void main(String[] args) {

MyDate date1 = new MyDate(14, 3, 1976);

MyDate date2 = new MyDate(14, 3, 1976);

if ( date1 == date2 ) {

System.out.println("date1 is identical to date2");

} else {

System.out.println("date1 is not identical to date2");

}

if ( date1.equals(date2) ) {

System.out.println("date1 is equal to date2");

} else {

System.out.println("date1 is not equal to date2");

}

System.out.println("set date2 = date1;");

date2 = date1;

if ( date1 == date2 ) {

System.out.println("date1 is identical to date2");

} else {

System.out.println("date1 is not identical to date2");

}

Code :- https://drive.google.com/open?id=0B08RKBSts8D8T3BWTGpyQmNJeG8

Java Arrays

1. SimpleCharArray

public class SimpleCharArray {
public static void main(String[] args) {
char[] characters = createArray();

printArray(characters);
System.out.println();
}

public static char[] createArray() {
char[] s;

s = new char[26];
for ( int i=0; i<26; i++ ) {
s[i] = (char) ('A' + i);
}

return s;
}

public static void printArray(char[] array) {
System.out.print('<');
for ( int i = 0; i < array.length; i++ ) {
// print an element
System.out.print(array[i]);
// print a comma delimiter if not the last element
if ( (i + 1) < array.length ) {
System.out.print(", ");
}
}
System.out.print('>');
}
}

code :- https://drive.google.com/open?id=0B08RKBSts8D8MXRsRVZ6MXNYSkE

Java Code stmts

1. Loops

public class Loops {
public static void main(String [] args) throws Throwable {

loop:
while (true) {
for (int i = 0; i < 100; i++) {
int c = System.in.read();
if (c == 'x') {
continue loop;
} else if (c == 'y') {
break loop;
} else {
System.out.print((char)c);
//System.out.flush();
}
}
System.out.println(">");
}
System.out.println();
}
}

2. ScopeExample

public class ScopeExample {

private int i=1;

public void firstMethod() {

int i=4, j=5;

this.i = i + j;

secondMethod(7);

}

public void secondMethod(int i) {

this.i = i;

}

3. StmtLabels

* This file tests a few variations on labelled break/continue statements.

public class StmtLabels {

public static void main(String[] args) {

int count = 0;

// test break label on compound statement

lab1:

{

System.out.println("before lab1");

if ( count == 0 )

{ break lab1; }

System.out.println("after lab1");

}

// test break label on an if statement

System.out.println("before lab1a");

lab1a:

if ( count == 0 ) {

break lab1a;

} else {

System.out.println("else clause; not break to lab1a");

}

System.out.println("after lab1a");

// test continue label on compound statement

lab2:

{

System.out.println("before lab2");

//if ( count == 0 )

//{ continue lab2; } CAN NOT continue A COMPOUND STMT

System.out.println("after lab2");

}

4. TestForLoop

public class TestForLoop {

public static void main(String[] args) {

for ( int i = 0; i < 10; i++ )

System.out.println(i + " squared is " + (i*i));

}

5. TestInitBeforeUse

public class TestInitBeforeUse {

public void doComputation() {

int x = (int)(Math.random() * 100);

int y;

int z;

if (x > 50) {

y = 9;

}

z = y + x; // Possible use before initialization

}

6. TestScoping

public class TestScoping {

public static void main(String[] args) {

ScopeExample scope = new ScopeExample();

scope.firstMethod();

}

7. TestShift

public class TestShift {

public static String bitPattern(int value) {

int BIT1_MASK = 1;

final char[] bits = new char[32];

for ( int i = 31; i >= 0; i-- ) {

if ( (value & BIT1_MASK) == 1 ) {

bits[i] = '1';

} else {

bits[i] = '0';

}

value >>>= 1;

}

return new String(bits);

}

public static void main(String[] args) {

int num1 = 1357;

int num2 = -1357;

System.out.println("num1 (" + num1 + ") as a bit pattern: " + bitPattern(num1));

System.out.println("num2 (" + num2 + ") as a bit pattern: " + bitPattern(num2));

System.out.println("" + num1 + " >> 5 = (" + (num1 >> 5) + ") " + bitPattern(num1 >> 5));

System.out.println("" + num2 + " >> 5 = (" + (num2 >> 5) + ") " + bitPattern(num2 >> 5));

System.out.println("" + num1 + " >>> 5 = (" + (num1 >>> 5) + ") " + bitPattern(num1 >>> 5));

System.out.println("" + num2 + " >>> 5 = (" + (num2 >>> 5) + ") " + bitPattern(num2 >>> 5));

System.out.println("" + num1 + " << 5 = (" + (num1 << 5) + ") " + bitPattern(num1 << 5));

System.out.println("" + num2 + " << 5 = (" + (num2 << 5) + ") " + bitPattern(num2 << 5));

}

num1 (1357) as a bit pattern: 00000000000000000000010101001101

num2 (-1357) as a bit pattern: 11111111111111111111101010110011

1357 >> 1 = 00000000000000000000001010100110

-1357 >> 1 = 11111111111111111111110101011001

1357 >> 5 = 00000000000000000000000000101010

-1357 >> 5 = 11111111111111111111111111010101

1357 >>> 5 = 00000000000000000000000000101010

-1357 >>> 5 = 00000111111111111111111111010101

1357 << 1 = 00000000000000000000101010011010

-1357 << 1 = 11111111111111111111010101100110

1357 << 5 = 00000000000000001010100110100000

-1357 << 5 = 11111111111111110101011001100000

8. TestWhileLoops

public class TestWhileLoops {

public static void main(String[] args) {

test1();

test2();

test3();

test4();

}

private static void test1() {

System.out.println("Test #1 - while loop with block");

int i = 0;

while ( i < 10 ) {

System.out.println(i + " squared is " + (i*i));

i++;

}

private static void test2() {

System.out.println("Test #2 - while loop with single statement");

int i = 0;

while ( i < 10 )

System.out.println(++i + " squared is " + (i*i));

}

private static void test3() {

System.out.println("Test #3 - do-while loop with block");

int i = 0;

do {

System.out.println(i + " squared is " + (i*i));

i++;

} while ( i < 10 );

}

private static void test4() {

System.out.println("Test #4 - do-while loop with single statement");

int i = 0;

System.out.println(++i + " squared is " + (i*i));

while ( i < 10 );

}

code:- https://drive.google.com/open?id=0B08RKBSts8D8Y2FWREVSSmpmeEk

Java Code types

1.Assign

public class Assign {
public static void main (String args []) {
// declare integer variables
int x, y;
// declare and assign floating point
float z = 3.414f;
// declare and assign double
double w = 3.1415;
// declare and assign boolean
boolean truth = true;
// declare character variable
char c;
// declare String variable
String str;
// declare and assign String variable
String str1 = "bye";
// assign value to char variable
c = 'A';
// assign value to String variable
str = "Hi out there!";
// assign values to int variables
x = 6;
y = 1000;
}
}

2. MyDate

public class MyDate {

private int day;

private int month;

private int year;

public MyDate(int day, int month, int year) {

this.day = day;

this.month = month;

this.year = year;

}

public MyDate(MyDate date) {

this.day = date.day;

this.month = date.month;

this.year = date.year;

}

public int getDay() {

return day;

}

public void setDay(int day) {

this.day = day;

}

public MyDate addDays(int more_days) {

MyDate new_date = new MyDate(this);

new_date.day = new_date.day + more_days;

// Not Yet Implemented: wrap around code...

return new_date;

}

public String toString() {

return "" + day + "-" + month + "-" + year;

}

3. PassTest

public class PassTest {

// Methods to change the current values

public static void changeInt(int value) {

value = 55;

}

public static void changeObjectRef(MyDate ref) {

ref = new MyDate(1, 1, 2000);

}

public static void changeObjectAttr(MyDate ref) {

ref.setDay(4);

}

public static void main(String args[]) {

MyDate date;

int val;

// Assign the int

val = 11;

// Try to change it

changeInt(val);

// What is the current value?

System.out.println("Int value is: " + val);

// Assign the date

date = new MyDate(22, 7, 1964);

// Try to change it

changeObjectRef(date);

// What is the current value?

System.out.println("MyDate: " + date);

// Now change the day attribute

// through the object reference

changeObjectAttr(date);

// What is the current value?

System.out.println("MyDate: " + date);

}

4. TestMyDate

public class TestMyDate {

public static void main(String[] args) {

MyDate my_birth = new MyDate(22, 7, 1964);

MyDate the_next_week = my_birth.addDays(7);

System.out.println(the_next_week);

}

Code :- https://drive.google.com/open?id=0B08RKBSts8D8RTJ0d3hiS1UzdWc

Java OOP Programmes

1. Exercise

public class Cat {
private int weight;

public Cat() {
weight = 42;
}

public int getWeight() {
return weight;
}
public void setWeight(int newWeight) {
weight = newWeight;
}
}

code :- https://drive.google.com/open?id=0B08RKBSts8D8ZHB3S0FsdVNlS1k

Java Programmes Introduction

Introduction:-

1. Greeting Code :-

// The Greeting class declaration.

public class Greeting {

public void greet() {

System.out.println("hi");

}

2. TestGreeting :-

//
// Sample "Hello World" application
//
public class TestGreeting {
public static void main (String[] args) {
Greeting hello = new Greeting();
hello.greet();
}

}

Code :- https://drive.google.com/open?id=0B08RKBSts8D8U0s5TjdNSVBCdk0