This code is not running and throws an exception

Question

import java.awt.*;

class loginwindow extends Frame
{
loginwindow()
{
this.setLayout(null);
Label l1 = new Label("Username :");
Label l2 = new Label("Password :");
Textfield t1 = new Textfield(20);
Textfield t2 = new Textfield(20);
Button b1,b2;
t2.setEchoChar("*");
b1 = new Button("Submit");
b2 = new Button("Reset");
this.add(l1);
this.add(t1);
this.add(l2);
this.add(t2);
this.add(b1);
this.add(b2);
}

public static void main(String args[])
{
loginwindow obj = new loginwindow();
obj.setVisible(true);
obj.setSize(400,400);
obj.setTitle("My log in window");
}

Answer 1

Abhinav Joshi do you have other files in your working directory

Answer 2

What is the error message you got?

Answer 3

Exception in thread "main" java.lang.UnsupportedOperationException: Not supported yet.
at loginwindow$Textfield.<init>(loginwindow.java:58)
at loginwindow$Textfield.<init>(loginwindow.java:52)
at loginwindow.<init>(loginwindow.java:20)
at loginwindow.main(loginwindow.java:42)
C:\Users\abhin\AppData\Local\NetBeans\Cache\8.2\executor-snippets\run.xml:53: Java returned: 1
BUILD FAILED (total time: 1 second)

Answer 4

*this* is not required when u r adding the component in your frame

new textfield(20)?? this declaration is wrong too..
u need to add action listener for your buttons and also need to set bounds for all your components.

Answer 5

kiRA

Adding action listeners and setting bounds are not compulsory

Answer 6

UHH! Just spotted the problem.

There are no class called Textfield in awt package.
It should be TextField

https://docs.oracle.com/javase/7/docs/api/java/awt/TextField.html

Answer 7

Sεηιrυ ραsαη then whats the point in declaring buttons if u r not even going to use them
And without set bounds , there will be no components visible on the screen

Answer 8

kiRA you are right. Buttons without listeners are clearly useless. But it's not mandatory.

Also LayoutManager s are anothrer way of positioning things.