write a java program to handle Text Field and Button using Action Listener

import java.awt.*;

import java.awt.event.*;

class EventHandle extends Frame implements ActionListener{

TextField textField;

EventHandle()

{

textField = new TextField();

textField.setBounds(60,50,170,20);

Button button = new Button("Quote");

button.setBounds(90,140,75,40);

button.addActionListener(this);

add(button);

add(textField);

setSize(250,250);

setLayout(null);

setVisible(true);

 addWindowListener(new WindowAdapter() {

            public void windowClosing(WindowEvent we) {

                System.exit(0);

            } });

}

public void actionPerformed(ActionEvent e){

textField.setText("Keep Learning");

}

public static void main(String args[]){

new EventHandle();

}  }

write a java program to create multiple threads

class NewThread implements Runnable {
  String name; // name of thread

  Thread t;

  NewThread(String threadname) {
    name = threadname;
    t = new Thread(this, name);
    System.out.println("New thread: " + t);
    t.start(); // Start the thread
  }

  public void run() {
    try {
      for (int i = 5; i > 0; i--) {
        System.out.println(name + ": " + i);
        Thread.sleep(1000);
      }
    } catch (InterruptedException e) {
      System.out.println(name + "Interrupted");
    }
    System.out.println(name + " exiting.");
  }
}

class MultiThreadDemo {
  public static void main(String args[]) {
    new NewThread("One"); // start threads
    new NewThread("Two");
    new NewThread("Three");

    try {
      Thread.sleep(10000);
    } catch (InterruptedException e) {
      System.out.println("Main thread Interrupted");
    }

    System.out.println("Main thread exiting.");
  }
}

Write java program that creates three threads. The first thread displays "Good Morning" for every one second, the second thread displays "Hello" for every two seconds and third thread displays "Welcome" for every three seconds.

class A extends Thread
{
     public void run()
     {
    try
    {
        while(true)
        {
           sleep(1000);
           System.out.println("good morning");
        }
    }
    catch(Exception e)
    { }
      }
}
class B extends Thread
{
      public void run()
      {
    try
    {
        while(true)
        {
        sleep(2000);
        System.out.println("hello");
        }
        }
      catch(Exception e)
    { }
      }
}
class C extends Thread
{
    public void run()
     {
    try
    {
        while(true)
        {
            sleep(3000);
            System.out.println("welcome");
        }
    }
    catch(Exception e)
    { }
     }
}
class ThreadDemo13
{
    public static void main(String args[])
    {
        A t1=new A();
        B t2=new B();
        C t3=new C();
        t1.start();
        t2.start();
        t3.start();
    }
}

Synchronization Method - Multi Threading

class First
{
 synchronized void display(String msg)
 {
  System.out.print ("["+msg);
  try
  {
   Thread.sleep(1000);
  }
  catch(InterruptedException e)
  {
   e.printStackTrace();
  }
  System.out.println ("]");
 }
}

class Second extends Thread
{
 String msg;
 First fobj;
 Second (First fp,String str)
 {
  fobj = fp;
  msg = str;
  start();
 }
 public void run()
 {
  fobj.display(msg);
 }
}

public class Syncro1
{
 public static void main (String[] args)
 {
  First fnew = new First();
  Second ss = new Second(fnew, "welcome");
  Second ss1= new Second (fnew,"new");
  Second ss2 = new Second(fnew, "programmer");
 }
}

Synchronization Block - Multi Threading Program in java

class First
{
 public void display(String msg)
 {
  System.out.print ("["+msg);
  try
  {
   Thread.sleep(1000);
  }
  catch(InterruptedException e)
  {
   e.printStackTrace();
  }
  System.out.println ("]");
 }
}

class Second extends Thread
{
 String msg; 
 First fobj;
 Second (First fp,String str)
 {
  fobj = fp;
  msg = str;
  start();
 }
 public void run()
 {
  synchronized(fobj)       //Synchronized block
  {
   fobj.display(msg);
  }
 }
}

public class Syncro2
{
 public static void main (String[] args)
 {
  First fnew = new First();
  Second ss = new Second(fnew, "welcome");
  Second ss1= new Second (fnew,"new");
  Second ss2 = new Second(fnew, "programmer");
 }
}

Grid Bag Layout - Rowspan- Colspan- Layout Manager

import java.awt.*;
/* <applet code=GridBag3.class width=300 height=300></applet>*/
public class GridBag3 extends java.applet.Applet {
    GridBagConstraints constraints = new GridBagConstraints();
    void addGB( Component component, int x, int y  ) {
        constraints.gridx = x; 
        constraints.gridy = y;
        add ( component, constraints );
    }
public void init() {
        setLayout( new GridBagLayout() );
        constraints.weightx = 1.0;
        constraints.weighty = 1.0;
        constraints.fill = GridBagConstraints.BOTH;
        int x, y;  // for clarity
        constraints.gridheight = 2; // Span two rows
        addGB( new Button("one"),   x=0, y=0 );
        constraints.gridheight = 1; // set it back
        addGB( new Button("two"),   x=1, y=0 );
        addGB( new Button("three"), x=2, y=0 );
        constraints.gridwidth = 2; // Span two columns
        addGB( new Button("four"),  x=1, y=1 );
        constraints.gridwidth = 1; // set it back
    }
}

Grid Bag Layout- Increasing Cell Size - Layout Manager

import java.awt.*;
/* <applet code=GridBag2.class width=300 height=300></applet>*/
public class GridBag2 extends java.applet.Applet {
    GridBagConstraints constraints = new GridBagConstraints();
    void addGB( Component component, int x, int y  ) {
        constraints.gridx = x; 
        constraints.gridy = y;
        add ( component, constraints );
    }
 public void init() {
        setLayout( new GridBagLayout() );
        constraints.weightx = 1.0;
        constraints.weighty = 1.0;
        constraints.fill = GridBagConstraints.BOTH;
        int x, y;  // for clarity
        addGB( new Button("North"),  x=1,y=0 );
        addGB( new Button("West"),   x=0,y=1 );
        addGB( new Button("Center"), x=1,y=1 );
        addGB( new Button("East"),   x=2,y=1 );
        addGB( new Button("North"),  x=1,y=2 );
    }
}