Java program (Action Listener)

Java program to change text enter in textField into italic,bold,and  arial.

import java.awt.*;

import java.awt.event.*;

import java.applet.*;

/*

<applet code="magic3.java" width=100 height=1000>

</applet>

*/

public class magic3 extends Applet implements ActionListener

{

       TextField tf;

       Button arial,bold,italic;

       Label l;

       Font f;

       public void init()

       {

              setLayout(null);

              setBackground(Color.pink);

             

              tf=new TextField();

             

              tf.setBounds(100,100,250,30);

              add(tf);

             

              arial=new Button("Arial");

             

              arial.setBounds(120,150,50,20);

              add(arial);

                          

              bold=new Button("Bold");

      

              bold.setBounds(180,150,50,20);

                     add(bold);

                          

              italic=new Button("Italic");

              add(italic);

              italic.setBounds(240,150,50,20);

      

              l=new Label();

              l.setBounds(100,200,25,30);

              add(l);

             

              arial.addActionListener(this);

               bold.addActionListener(this);

                italic.addActionListener(this);

       }

       public void actionPerformed(ActionEvent ae)

       {

              if(ae.getSource()==arial)

              {

                     f=new Font("Arial Narrow",0,20);

                     l.setText(tf.getText());

                     l.setFont(f);

              }

              else if(ae.getSource()==bold)

              {      f=new Font("Arial Narrow",1,20);

                     l.setText(tf.getText());

                     l.setFont(f);

              }

              else if(ae.getSource()==italic)

              {      f=new Font("Arial Narrow",2,20);

                     l.setText(tf.getText());

                     l.setFont(f);

              }

       }

}

Java program to  perform operation such as Tan,sin,sqrt,in applet

import java.awt.*;

import java.applet.*;

import java.awt.event.*;

import java.util.*;

public class sak1 extends Applet implements ActionListener

{

       TextField tf1,tf2;

       Button log,sin,sqrt,tan;

       public void init()

       {

              setLayout(null);

              setBackground(Color.gray);

      

              tf1=new TextField();

              tf1.setBounds(100,100,250,30);

              add(tf1);

      

              log=new Button("Log");

              log.setBounds(120,150,50,20);

              add(log);

             

              sin=new Button("Sin");

              sin.setBounds(180,150,50,20);

              add(sin);

             

              sqrt=new Button("Sqrt");

              sqrt.setBounds(240,150,50,20);

              add(log);

              tan=new Button("tan");

              tan.setBounds(300,150,50,20);

              add(log);

              tf2=new TextField();

              tf2.setBounds(100,200,250,30);

              add(tf2);

             

              log.addActionListener(this);

                     sin.addActionListener(this);

                     sqrt.addActionListener(this);

                     tan.addActionListener(this);

       }

       public void actionListener(ActionEvent ae)

       {

       if(ae.getSource()==log)

       {

              double d1=Double.parseDouble(tf1.getText());

              double ans=Math.log(d1);

              tf2.setText("Log("+d1+")="+ans);

       }

       else if(ae.getSource()==sin)

       {

             

              double d1=Double.parseDouble(tf1.getText());

              double ans=Math.sin(d1);

              tf2.setText("Sine("+d1+")="+ans);

       }

       else if(ae.getSource()==sqrt)

       {

             

              double d1=Double.parseDouble(tf1.getText());

              double ans=Math.sqrt(d1);

              tf2.setText("Sqrt("+d1+")="+ans);

       }

       else if(ae.getSource()==tan)

       {

      

              double d1=Double.parseDouble(tf1.getText());

              double ans=Math.tan(d1);

              tf2.setText("Tan("+d1+")="+ans);

       }

}

}

/*

<applet code="sak1.java" width=100 height=200>

</applet>

*/

     


java program to count number of vowel enter in textfield in applet

import java.applet.*;

import java.awt.*;

import java.awt.event.*;

import java.awt.event.ActionListener;

import java.lang.*;

public class pst1 extends Applet implements ActionListener

{            

       TextField tf;

       TextArea ta;

       Button b1;

       int count=0;

       public void init()

       {

              setLayout(null);

             

              tf=new TextField();

              add(tf);

              tf.setBounds(20,20,120,30);

      

              ta=new TextArea();

              add(ta);

              ta.setBounds(20,60,120,30);

              b1=new Button("calculate");

              add(b1);

              b1.setBounds(20,120,100,40);

              b1.addActionListener(this);

       }

       public void actionPerformed(ActionEvent ae)

       {

              String str=ta.getText();

              int len=str.length();

              for(int i=0;i<len;i++)

              {

                     if(str.charAt(i)=='a'||str.charAt(i)=='e'||str.charAt(i)=='i'||str.charAt(i)=='u')

                     count++;

              }

       tf.setText(""+count);

       }

}

/*

<applet code="pst1.java" width=100 height=100>

</applet>

*/