Java Programs: Threads, Sync, Frame Windows, Drawing Shapes with Interfaces and Libraries, Exercises of Java Programming

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Q.1 Write a Java program to create a thread using Runnable interface

package mythread; class MyThread implements Runnable { String name; Thread t; MyThread (String thread){ name = "threadname"; t = new Thread( this , name); System. out .println("New thread: " + t); t.start(); } 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 MultiThread { public static void main(String args[]) { new MyThread("One"); new MyThread("Two"); new MyThread("Three"); try { Thread. sleep (10000); } catch (InterruptedException e) { System. out .println("Main thread Interrupted"); } System. out .println("Main thread exiting."); } }

Q.2 Write a Java program to illustrate synchronization concept in Threads

class PrintDemo { public void printCount() { try { for ( int i = 5; i > 0; i--) { System. out .println("Counter --- " + i ); } } catch (Exception e) { System. out .println("Thread interrupted."); } } }

class ThreadDemo extends Thread { private Thread t; private String threadName; PrintDemo PD;

ThreadDemo( String name, PrintDemo pd) { threadName = name; PD = pd; }

public void run() { synchronized (PD) { PD.printCount(); } System. out .println("Thread " + threadName + " exiting."); }

public void start () { System. out .println("Starting " + threadName ); if (t == null ) { t = new Thread ( this , threadName); t.start (); } } }

public class SyncRunner {

public static void main(String args[]) { PrintDemo PD = new PrintDemo();

ThreadDemo T1 = new ThreadDemo( "Thread - 1 ", PD ); ThreadDemo T2 = new ThreadDemo( "Thread - 2 ", PD );

T1.start(); T2.start();

// wait for threads to end try { T1.join(); T2.join();

} catch ( Exception e) { System. out .println("Interrupted"); } } }

Q.3 Write an applet program to illustrate the Frame window

package AppletWind;

//Create a child frame window from within an applet. import java.awt.; import java.awt.event.; import java.applet.; /

*/

class SampleFrame extends Frame { SampleFrame(String title) { super (title); MyWindowAdapter adapter = new MyWindowAdapter( this );

addWindowListener(adapter); } public void paint(Graphics g) { g.drawString("This is in frame window", 10, 40); } } class MyWindowAdapter extends WindowAdapter { SampleFrame sampleFrame; public MyWindowAdapter(SampleFrame sampleFrame) { this .sampleFrame = sampleFrame; } public void windowClosing(WindowEvent we) { sampleFrame.setVisible( false ); }} public class AppletFrame extends Applet { Frame f; public void init() { f = new SampleFrame("A Frame Window"); f.setSize(250, 250); f.setVisible( true ); } public void start() { f.setVisible( true ); } public void stop() { f.setVisible( false ); } public void paint(Graphics g) { g.drawString("This is in applet window", 10, 20); } }

Q.4 Write an applet program to illustrate the Menu and Submenu controls

package appMenu;

import java.awt.*; class AWTMenu extends Frame { MenuBar mbar; Menu menu,submenu, chips; MenuItem m1,m2,m3,m4,m5,m9,m10, m11;

public AWTMenu() {

// Set frame properties setTitle("JOSEE AWT "); // Set the title setSize(400,400); // Set size to the frame setLayout( new FlowLayout()); // Set the layout setBackground(Color. magenta ); setVisible( true ); // Make the frame visible setLocationRelativeTo( null ); // Center the frame

// Create the menu bar mbar= new MenuBar();

// Create the menu menu = new Menu("Programmes"); chips= new Menu("Lecturer");

// Create the submenu submenu= new Menu("MSIt");

// Create MenuItems m1= new MenuItem("mobile programming"); m2= new MenuItem("Java programming"); m3= new MenuItem("LAN MAN"); m4= new MenuItem("computer architecture"); m5= new MenuItem(" Wed Development ");

m9= new MenuItem(" Mr. Lameck Nsama"); m10= new MenuItem("Mr. Thinakaran Anansingh"); m11 = new MenuItem("Mr. Chuunga "); // Attach menu items to menu menu.add(m1); menu.add(m2); menu.add(m3); chips.add(m9); chips.add(m10); chips.add(m11); // Attach menu items to submenu submenu.add(m4); submenu.add(m5);

// Attach submenu to menu menu.add(submenu);

// Attach menu to menu bar mbar.add(menu);

mbar.add(chips); // Set menu bar to the frame setMenuBar(mbar); } public static void main(String args[]) { new AWTMenu(); } }

Q.5 Write an applet program to draw various graphical shapes

package praphix;

import java.applet.; import java.awt.;

public class fillColor extends Applet{

public void paint(Graphics g){

g.drawLine(30,300,200,10); g.drawOval(250,50,100,100); g.drawRect(400,50,200,100);

}

}