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‎BtnDemo1.java

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//To demonstrate addition function using Button
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import java.awt.*;
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import java.awt.event.*;
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import java.applet.*;
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/*<applet code="BtnDemo1" width=100 height=100></applet>*/
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public class BtnDemo1 extends Applet implements ActionListener
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{
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TextField t1,t2,t3;
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Button b;
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public void init()
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{
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t1=new TextField(10);
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t2=new TextField(10);
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t3=new TextField(10);
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b=new Button("Add");
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add(t1);
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add(t2);
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add(t3);
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add(b);
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b.addActionListener(this); //registration
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}
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public void actionPerformed(ActionEvent ae)
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{
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int n1=Integer.parseInt(t1.getText());
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int n2=Integer.parseInt(t2.getText());
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int rs=n1+n2;
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t3.setText(" " +rs);
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}
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}

‎BtnDemo2.java

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//To calculate factorial using Button
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import java.awt.*;
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import java.awt.event.*;
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import java.applet.*;
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/*<applet code="BtnDemo2" width=100 height=100></applet>*/
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public class BtnDemo2 extends Applet implements ActionListener
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{
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TextField t1,t2;
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Button b;
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public void init()
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{
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t1=new TextField(10);
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t2=new TextField(10);
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b=new Button("Factorial");
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add(t1);
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add(t2);
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add(b);
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b.addActionListener(this);
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}
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public void actionPerformed(ActionEvent ae)
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{
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int n=Integer.parseInt(t1.getText());
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int fact=1;
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for(int i=1;i<=n;i++)
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{
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fact=fact*i;
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}
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t2.setText(" "+fact);
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}
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}

‎BtnDemo3.java

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//To find greatest of two numbers using button
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import java.awt.*;
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import java.awt.event.*;
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import java.applet.*;
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/*<applet code="BtnDemo3" width=100 height=100></applet>*/
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public class BtnDemo3 extends Applet implements ActionListener
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{
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Label l1,l2,l3;
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TextField t1,t2,t3;
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Button b;
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public void init()
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{
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l1=new Label("Number 1");
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l2=new Label("Number 2");
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l3=new Label("Greatest of two");
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t1=new TextField(10);
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t2=new TextField(10);
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t3=new TextField(10);
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b=new Button("Find greatest");
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add(l1);
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add(t1);
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add(l2);
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add(t2);
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add(l3);
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add(t3);
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add(b);
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b.addActionListener(this);
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}
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public void actionPerformed(ActionEvent ae)
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{
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int n1=Integer.parseInt(t1.getText());
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int n2=Integer.parseInt(t2.getText());
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int gr_no;
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if(n1>n2)
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gr_no=n1;
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else
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gr_no=n2;
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t3.setText(""+gr_no);
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}
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}

‎BtnDemo4.class

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‎BtnDemo4.java

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//To setbackground color (0-255 values for red, green and blue)using Button
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import java.awt.*;
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import java.awt.event.*;
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import java.applet.*;
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/*<applet code="BtnDemo4" height=100 width=100></applet>*/
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public class BtnDemo4 extends Applet implements ActionListener
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{
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Label l1,l2,l3;
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TextField t1,t2,t3;
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Button b;
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public void init()
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{
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l1=new Label("Red");
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l2=new Label("Green");
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l3=new Label("Blue");
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t1=new TextField(5);
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t2=new TextField(5);
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t3=new TextField(5);
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b=new Button("Show resultant color");
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add(l1);
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add(t1);
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add(l2);
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add(t2);
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add(l3);
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add(t3);
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add(b);
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b.addActionListener(this);
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}
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public void actionPerformed(ActionEvent ae)
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{
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int r=Integer.parseInt(t1.getText());
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int g=Integer.parseInt(t2.getText());
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int b=Integer.parseInt(t3.getText());
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Color c=new Color(r,g,b);
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setBackground(c);
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}
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}

‎BtnDemo5.java

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//To find greatest of three numbers using button
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import java.awt.*;
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import java.awt.event.*;
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import java.applet.*;
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/*<applet code="BtnDemo5" width=100 height=100></applet>*/
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public class BtnDemo5 extends Applet implements ActionListener
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{
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Label l1,l2,l3,l4;
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TextField t1,t2,t3,t4;
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Button b;
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public void init()
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{
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l1=new Label("Number 1");
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l2=new Label("Number 2");
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l3=new Label("Number 3");
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l4=new Label("Greatest of three");
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t1=new TextField(10);
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t2=new TextField(10);
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t3=new TextField(10);
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t4=new TextField(10);
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b=new Button("Find greatest");
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add(l1);
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add(t1);
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add(l2);
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add(t2);
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add(l3);
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add(t3);
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add(l4);
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add(t4);
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add(b);
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b.addActionListener(this);
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}
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public void actionPerformed(ActionEvent ae)
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{
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int n1=Integer.parseInt(t1.getText());
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int n2=Integer.parseInt(t2.getText());
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int n3=Integer.parseInt(t3.getText());
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int gr_no;
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if(n1>n2)
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{
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if(n1>n3)
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gr_no=n1;
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else
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gr_no=n3;
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}
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else
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{
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if(n2>n3)
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gr_no=n2;
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else
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gr_no=n3;
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}
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t4.setText(""+gr_no);
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}
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}

‎ChoiceDemo.java

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import java.awt.*;
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import java.awt.event.*;
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import java.applet.*;
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/*<applet code="ChoiceDemo" width=100 height=100></applet>*/
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public class ChoiceDemo extends Applet implements ItemListener
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{
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Label l1,l2,l3;
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TextField t1,t2,t3;
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Choice c;
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int rs;
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public void init()
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{
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c=new Choice();
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c.add("Addition");
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c.add("Subtraction");
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c.add("Multiplication");
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c.add("Division");
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c.add("Modulo Division");
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l1=new Label("Number 1");
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l2=new Label("Number 2");
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l3=new Label("Result");
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t1=new TextField(10);
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t2=new TextField(10);
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t3=new TextField(10);
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add(l1); add(t1);
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add(l2); add(t2);
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add(c);
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add(l3); add(t3);
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c.addItemListener(this);
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}
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public void itemStateChanged(ItemEvent ie)
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{
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int n1=Integer.parseInt(t1.getText());
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int n2=Integer.parseInt(t2.getText());
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rs=0;
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int idx=c.getSelectedIndex();
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if(idx==0)
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rs=n1+n2;
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else if(idx==1)
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rs=n1-n2;
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else if(idx==2)
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rs=n1*n2;
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else if(idx==3)
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rs=n1/n2;
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else if(idx==4)
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rs=n1%n2;
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t3.setText(""+rs);
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}
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}

‎Circle.java

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//To calculate area and circumference of circle
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import java.util.*;
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class Circle
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{
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public static void main(String args[])
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{
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final float PI=3.14f;
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float r,a,c;
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System.out.print("Enter radius: ");
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Scanner sc=new Scanner(System.in);
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r=sc.nextFloat();
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a=PI*r*r;
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c=2*PI*r;
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System.out.println("Area: "+a);
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System.out.println("Circumference: "+c);
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}
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}
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‎CompareStrings.java

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class CompareStrings
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{
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public static void main(String args[])
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{
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String s1="core";
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String s2="java";
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String s3="core";
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System.out.println("Result 1: "+s1.compareTo(s2));
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System.out.println("Result 2: "+s1.compareTo(s3));
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}
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}

‎ConditionalOp1.java

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//To find greatest of two numbers using conditional operator.
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import java.lang.*;
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class ConditionalOp1
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{
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public static void main(String args[])
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{
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int a=Integer.parseInt(args[0]);
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int b=Integer.parseInt(args[1]);
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int max=a>b ? a : b;
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System.out.println("Greatest= "+max);
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}
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}

‎Cricket.java

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//To find cricket score and run rate
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import java.lang.*;
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import java.util.*;
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class Cricket
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{
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public static void main(String args[])
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{
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Scanner sc=new Scanner(System.in);
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System.out.println("ODI MATCH SCORECARD");
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System.out.println("Enter the name of team batting first: ");
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String team1=sc.next();
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int score1=0;
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float rr1=0;
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for(int i=1;i<=11;i++) //Assuming that all 11 players batted
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{
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System.out.print("Enter player name: ");
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String nm1=sc.next();
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System.out.print("Enter runs scored by player: ");
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int runs1=sc.nextInt();
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score1=runs1+score1;
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rr1=(float)((score1))/50;
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}
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System.out.println("Total runs: "+score1);
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System.out.println("Run rate: "+rr1);
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System.out.println(team1+" scored "+score1+" runs at run rate "+rr1);
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}
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}
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