Notes

package uugn;

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


import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class Exercise3 extends JFrame implements ActionListener {
private JButton btn1, btn2;
private JPanel p1,p2;
private TextField txt1, txt2, txt3;
private Label lb1, lb2;


public Exercise3() {
lb1 = new Label("Character");
lb2 = new Label("String");
txt1 = new TextField();
txt2 = new TextField();
txt3 = new TextField();
btn1 = new JButton("Show");
btn2 = new JButton("Clear");
p1 = new JPanel();
p2 = new JPanel();


p1.add(lb1);
p1.add(txt1);
p1.add(btn1);
p1.add(lb2);
p1.add(txt2);
p1.add(btn2);
p2.add(txt3);
this.add(p1);
this.add(p2);



lb1.setBounds(80, 50, 80, 20);
lb2.setBounds(100, 100, 40, 20);
txt1.setBounds(160, 50, 120, 20);
txt2.setBounds(160, 100, 120, 20);
txt3.setBounds(80, 0, 300, 100);
btn1.setBounds(300, 50, 80, 20);
btn2.setBounds(300, 100, 80, 20);
p1.setLayout(null);
p2.setLayout(null);



btn1.addActionListener(this);
btn2.addActionListener(this);

this.setTitle("Exercise");
this.setLayout(new GridLayout(2, 1));
this.setSize(500,400);
this.setVisible(true);
this.setResizable(false);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}

@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
int i, k, sum=0;

if (e.getSource() == btn1) {
String c = txt1.getText();
String s = txt2.getText();
char ch[] = s.toCharArray();

char c1 = c.charAt(0);
for(i=0;i<s.length();i++){
if(ch[i]==c1) {
sum++;
}
}

txt3.setText(c + " = " + sum + " times " + "Lenght of string " + s.length());

}

if (e.getSource() == btn2) {
txt1.setText("");
txt2.setText("");
txt3.setText("");

}
}

}




package uugn;

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


import javax.swing.*;
import javax.swing.plaf.ColorUIResource;




public class Exercise2 extends JFrame implements ActionListener {
private JButton b1 ;

private JPanel p1;

public Exercise2() {


p1 = new JPanel();
b1 = new JButton("→");


p1.setSize(120,100);
p1.setLocation(170,50);
p1.setBackground(Color.red);
b1.setBounds(40, 80, 80, 40);
p1.setBackground(Color.red);
b1.addActionListener(this);

this.add(b1);
this.add(p1);
this.setSize(350, 250);

this.setLayout(null);
setVisible(true);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}



@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub

if (e.getSource() == b1) {

if(p1.getBackground()==Color.red) {
p1.setBackground(Color.green);
}

else if(p1.getBackground()==Color.green) {
p1.setBackground(Color.blue);
}
else if(p1.getBackground()==Color.blue){
p1.setBackground(Color.red);
}







}
}

}