Practical No: 12
Name :- Minakshi Sunil Bhavar
Roll no :- 20
1.import javax.swing.*;
public class PasswordFieldExample
{
public static void main(String[] args)
{
JFrame f=new JFrame("Password Field Example");
JPasswordField value = new JPasswordField();
value.setEchoChar('#');
JLabel l1=new JLabel("Password:");
l1.setBounds(20,100, 80,30);
value.setBounds(100,100,100,30);
f.add(value); f.add(l1);
f.setSize(300,300);
f.setLayout(null);
f.setVisible(true);
}
}
OUTPUT:
2. import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
class Test extends JFrame implements ActionListener {
JButton jb1;
JTextField jt1, jt2;
JLabel lbl;
Test() {
jt1 = new JTextField();
jt1.setBounds(90, 50, 150, 30);
add(jt1);
jt2 = new JTextField();
jt2.setBounds(90, 80, 150, 30);
add(jt2);
lbl = new JLabel("Result :");
lbl.setBounds(90, 140, 150, 30);
add(lbl);
jb1 = new JButton("+");
jb1.setBounds(90, 200, 100, 30);
add(jb1);
jb1.addActionListener(this);
setLayout(null);
setSize(600, 400);
setVisible(true);
public void actionPerformed(ActionEvent e) {
int a = Integer.parseInt(jt1.getText());
int b = Integer.parseInt(jt2.getText());
int c = 0;
if (e.getSource().equals(jb1)) {
c = a + b;
lbl.setText(String.valueOf(c));
}
}
public static void main(String args[]) {
Test t = new Test();
}}
OUTPUT:
3. // Java Program to change the echo character of
// JPasswordField and set initial text for password field
import java.awt.event.*;
import java.awt.*;
import javax.swing.*;
class text extends JFrame implements ActionListener, FocusListener {
// JTextField
static JTextField t;
// JPasswodField
static JPasswordField pass;
// JFrame
static JFrame f;
// JButton
static JButton b;
// label to display text
static JLabel l;
// default constructor
text()
{
}
// main class
public static void main(String[] args)
{
// create a new frame to store text field and button
f = new JFrame("textfield");
// create a label to display text
l = new JLabel("nothing entered");
// create a new button
b = new JButton("submit");
// create a object of the text class
text te = new text();
// addActionListener to button
b.addActionListener(te);
// create a object of JTextField with 16 columns and initial text
t = new JTextField("enter name", 16);
// create a object of passwodField with 16 columns
pass = new JPasswordField(16);
// add FocusListener to passwordField
pass.addFocusListener(te);
// set the echo character of the password field
pass.setEchoChar((char)0);
// set initial text for password field
pass.setText("enter password");
// set the echo character of the password field
// create an object of font type
Font fo = new Font("Serif", Font.ITALIC, 20);
// set the font of the textfield
t.setFont(fo);
// create a panel to add buttons and textfield
JPanel p = new JPanel();
// add buttons and textfield to panel
p.add(t);
p.add(pass);
p.add(b);
p.add(l);
// add panel to frame
f.add(p);
// set the size of frame
f.setSize(300, 300);
f.show();
}
// flag to set the text to blank for the first time when the component gets focus
boolean flag = true;
// events of focus listener
// when focus is gained
public void focusGained(FocusEvent e)
{
if (flag) {
// set a definite echo char
pass.setEchoChar('*');
// only set the text to blank for 1st time
// set the text to blank
pass.setText("");
flag = false;
}
}
// when the focus is lost
public void focusLost(FocusEvent e)
{
}
// if the button is pressed
public void actionPerformed(ActionEvent e)
{
String s = e.getActionCommand();
if (s.equals("submit")) {
// set the text of the label to the text of the field
l.setText("name = " + t.getText() + "\t, Password = " + pass.getText());
// set the text of field to blank
t.setText(" ");
// set the text of password field to blank
pass.setText("");
}
}
}
OUTPUT:
