Let's say there is a button and if you will click that, a new frame will appear and so on...

解决方案

The setVisible(true); function is used to display a frame. Create an object of the desired frame and call this function. Something like this

//The applications first or the main frame

import javax.swing.*;

import java.awt.*;

import java.awt.event.*;

public class MainFrame extends JFrame {

private JButton myFirstButton;

private JButton mySecondButton;

// Constructor for a new frame

public MainFrame {

super("My First Button Program");

myFirstButton = new JButton("First Frame");

myFirstButton.setFont(new Font( "Arial", Font.BOLD, 18));

myFirstButton.setBackground(Color.red);

mySecondButton = new JButton("New Frame");

mySecondButton.setFont(new Font( "Arial", Font.BOLD, 18));

mySecondButton.setBackground(Color.green);

Container c = getContentPane();

FlowLayout fl = new FlowLayout(FlowLayout.LEFT);

c.setLayout(fl);

c.add (myFirstButton);

c.add (mySecondButton);

ButtonHandler handler = new ButtonHandler(); //creation of a new Object

myFirstButton.addActionListener(handler); // Attach/register handler to myFirstButton

mySecondButton.addActionListener(handler); //Attach/register handler to mySecondButton

setSize(400, 300);

show();

}

public static void main(String [] args) {

// Make frame

MainFrame f = new MainFrame();

f.addWindowListener(

new WindowAdapter() {

public void windowClosing(WindowEvent e) {

// This closes the window and terminates the

// Java Virtual Machine in the event that the

// Frame is closed by clicking on X.

System.out.println("Exit via windowClosing.");

System.exit(0);

}

}

);

} // end of main

// inner class for button event handling

private class ButtonHandler implements ActionListener {

public void actionPerformed(ActionEvent e) {

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

new NewFrame1();

}

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

new NewFrame2();

}

}

} // end of inner class

} // end of outer class

The frame to be opened for first button

//import statements here

public class NewFrame1 extends JFrame implements ActionListener

{

//initialises the frame and opens it

public NewFrame1()

{

JButton open = new JButton("New Window");

open.addActionListener(this);

add(open);

setVisible(true);

}

public void actionPerformed(ActionEvent event)

{

//code for the new frame

}

}

The frame to be opened for second button

//import statements here

public class NewFrame2 extends JFrame implements ActionListener

{

//initialises the frame and opens it

public NewFrame2()

{

JButton open = new JButton("New Window");

open.addActionListener(this);

add(open);

setVisible(true);

}

public void actionPerformed(ActionEvent event)

{

//code for the new frame

}

}