SQL with Manoj

Q56: Java Program to write an applet, which has a menu bar containing Shape, Color item. The Shape menu contains sub-menu containing Line, rectangle, Circle, Ellipse & the Color menu contains sub-menu Red, Green, Blue, Pink. On sellecting the appropriate menu item by the user it should be reflected to the Applet on the screen.

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

class MenuFrame extends Frame implements ActionListener {
	String col;
    	int shape;

	public MenuFrame(String title) {
		super(title);
      		MenuBar mbar=new MenuBar();
		setMenuBar(mbar);
		
      	Menu shape=new Menu("shape");
		MenuItem item1,item2,item3,item4;
		shape.add(item1 =new MenuItem("Line"));
		shape.add(item2 =new MenuItem("Rectangle"));
	 	shape.add(item3 =new MenuItem("Circle"));
		shape.add(item4 =new MenuItem("Ellipse"));
		mbar.add(shape);
		
		Menu color=new Menu("color");
		MenuItem item5,item6,item7,item8;
		color.add(item5= new MenuItem("red"));
		color.add(item6= new MenuItem("green"));
		color.add(item7= new MenuItem("blue"));
		color.add(item8= new MenuItem("pink"));
		mbar.add(color);

		item1.addActionListener(this);
        	item2.addActionListener(this);
        	item3.addActionListener(this);
        	item4.addActionListener(this);
        	item5.addActionListener(this);
        	item6.addActionListener(this);
        	item7.addActionListener(this);
        	item8.addActionListener(this);
	}
	
	public void paint(Graphics g){
		if (col.equals("red")){
			g.setColor(Color.red);
		}
		else if(col.equals("green")){
			g.setColor(Color.green);
		}
		else if(col.equals("blue")){
			g.setColor(Color.blue);
		}
		else if(col.equals("pink")){
        		g.setColor(Color.pink);
		}
			
		switch(shape){
			case 1:
				g.drawLine(100,100,200,200);	    
				break;
			case 2 :
				g.drawRect(10,10,60,50);
				break;
			case 3:
				g.drawOval(10,10,100,100);
				break;		
			case 4:
				g.drawOval(10,10,100,50);
				break;		
		}
	}
	
	public void actionPerformed(ActionEvent ae){
		String msg="You selected";
		String arg=(String)ae.getActionCommand();
		
		if(arg.equals("red")){
	 			col="red";
	     	}
    	    	else if(arg.equals("blue")){
	 		col="blue";
	     	}
        	else if(arg.equals("green")){
			col="green";
        	}
        	else if (arg.equals("pink")){
	 		col="pink";
        	}         
		
		repaint();

        	if(arg.equals("Line"))
        		shape=1;
        	else if(arg.equals("Rectangle"))
        		shape=2;
        	else if(arg.equals("Circle"))
        		shape=3;
        	else if(arg.equals("Ellipse"))
        		shape=4; 
		
		repaint();
		}
	}
	
public class menushape extends Applet  {
	MenuFrame mf;
	
	public void init() {
    		MenuFrame mf=new MenuFrame("my frame");
     		mf.setVisible(true);
     		mf.setSize(200,200);
	}
}

… from College notes (BCA/MCA assignments):

Q55: Java Program to write an applet, which shows a two set of check boxes. The first set is independent and second set belongs to a checkbox group (like radio buttons). Whichever check box is selected by the user, it should be displayed on the screen.

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

abstract class Ap_CheckboxGroupDemo extends Applet implements ItemListener{
 	String msg = "";
 	Checkbox Win98, WinNT;
 	CheckboxGroup cbg;
 	Button Win;
 	MyCheckbox myCheckbox1,myCheckbox2,myCheckbox3;

 	public void init(){
 		Win98 = new Checkbox("Windows 98/Xp");
 		WinNT = new Checkbox("Windows NT/2000");
 		
 		add(Win98);
 		add(WinNT);
 		
 		Win98.addItemListener(this);
 		WinNT.addItemListener(this);
 		
 		cbg = new CheckboxGroup();
 		myCheckbox1 = new MyCheckbox("Item 1",cbg,true);
 		add(myCheckbox1);
 		
 		myCheckbox2 = new MyCheckbox("Item 2",cbg,false);
 		add(myCheckbox2);
 		
 		myCheckbox3 = new MyCheckbox("Item 3",cbg,false);
 		add(myCheckbox3);
	}
	
	public void paint(Graphics g){
		msg = "current state: ";
 		g.drawString(msg,6,80);
 		msg = "Windows 98/Xp:" + Win98.getState();
 		g.drawString(msg,6,100);
 		msg = "Windows NT/2000:" + WinNT.getState();
 	}
 }
 		
 


class MyCheckbox extends Checkbox{
 	
 	public MyCheckbox(String label,CheckboxGroup cbg,boolean flag){
 		super(label,cbg,flag);
 		enableEvents(AWTEvent.ITEM_EVENT_MASK);
	}
	
	protected void processItemEvent(ItemEvent ie){
		showStatus("checkbox name/state: " + getLabel() + 
 					"/" + getState());
 		super.processItemEvent(ie);
	}
}

… from College notes (BCA/MCA assignments):

Q54: Java Program to write an applet, which shows one choice item and one list item. Add some items in both. Whenever user selects an item that message should be displayed on the screen.

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

public class Ap_ListDemo extends Applet implements ActionListener {
	
	List os, browser;
	String msg = "";
	
	public void init(){
		os = new List(4,true);
		
		browser = new List(4,false);
		
		os.add("Windows 98/Xp");
		os.add("Solaris");
		os.add("Macos");
		
		browser.add("netscape 3.x");
		browser.add("netscape 4.x");
		browser.add("netscape 5.x");
		browser.add("netscape 6.x");
		browser.add("internet explorer 4.0");
		browser.add("internet explorer 5.0");
		browser.add("internet explorer 6.0");
		browser.add("Lynx 2.4");
		
		browser.select(1);
		
		add(os);
		add(browser);
		
		os.addActionListener(this);
		browser.addActionListener(this);
	}
	
	public void actionPerformed(ActionEvent ae){
		repaint();
	}
	
	public void paint(Graphics g){
		int idx[];
		
		msg = "current OS";
		idx = os.getSelectedIndexes();
		for(int i = 0; i < idx.length; i++)
			msg += os.getItem(idx[i]) + " ";
		
		g.drawString(msg,6,120);
		msg = "current Browser: ";
		msg += browser.getSelectedItem();
		g.drawString(msg,6,140);
	}
}

… from College notes (BCA/MCA assignments):

Q53: Java Program to write an applet which have three text fields, first two accepts input from user and third one shows the result. It should have four buttons indicating operation add, subtract, multiply and divide, pressing the button should put the result in the third text field.

import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import java.awt.TextField.*;

public class Ap_Calc extends Applet implements ActionListener{
	TextField one, two, res;
	Button add, sub, mul, div;

	public void init(){
		Label l1 = new Label("First Number:   ",Label.RIGHT);
		Label l2 = new Label("Second Number:  ",Label.RIGHT);
		Label l3 = new Label("Result:         ",Label.RIGHT);
 
		one = new TextField(5);
		two = new TextField(5);
		res = new TextField(7);

		add = new Button("Add");
		sub = new Button("Substract");
		mul = new Button("Multiply");
		div = new Button("Divide");

		add(l1);
		add(one);
		add(l2);
		add(two);
		add(l3);
		add(res);
	
		add(add);
		add(sub);
		add(div);
		add(mul);

		one.addActionListener(this);
		two.addActionListener(this);
		res.addActionListener(this);
		add.addActionListener(this);
		sub.addActionListener(this);
		div.addActionListener(this);
		mul.addActionListener(this);		
	}

	public void actionPerformed(ActionEvent ae){
		String str = ae.getActionCommand();
		float b1, b2, b3 = 0;
		String msg;
		
		b1 = Float.parseFloat(one.getText());
		b2 = Float.parseFloat(two.getText());
		
		if(str.equals("Add"))
			b3 = b1 + b2;
		if(str.equals("Substract"))
			b3 = b1 - b2;
		if(str.equals("Divide"))
			b3 = b1 / b2;
		if(str.equals("Multiply"))
			b3 = b1 * b2;
		msg = String.valueOf(b3);
		res.setText(msg);	
		repaint();
	}
	
	public void paint(Graphics g){
	}
}

… from College notes (BCA/MCA assignments):