代写program程序、代做Java语言编程、Java程序设计调试

日期：2021-05-24 10:50

A GUI guide for Blackjack Project

GUI is short for Graphical User Interfaces. User can use GUI to communicate with program. In

java, we can use Swing or JavaFX to build a GUI. In this guide, we use Swing as an example.

1 Swing component

JFrame: Java GUI programs are based on JFrame. It is the object of the window on the screen,

which can be maximized, minimized and closed.

JPanel: The panel container class in swing. It is a lightweight Container, can be added to the

JFrame form. The function is to combine components with the same logic function in the

form.

JTextField: A lightweight component. It allow the user to edit single line text.

JButton: An instance of JButton class. Use to create buttons.

2 Hello world GUI

Code

import javax.swing.JFrame;

import javax.swing.JLabel;

import java.awt.*;

public class HelloWorld extends JFrame{

public HelloWorld(){

setTitle("Hello GUI");

// Set the window size

setSize(400,200);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

// Add a label

JLabel label = new JLabel("Hello world, this is my first swing GUI.");

Container container = getContentPane();

container.add(label);

setVisible(true);

}

public static void main(String[] args) {

new HelloWorld();

}

}

What you got

After clicking the button for 5 times,

3 More complex demo

Let's see a more complex demo with image.

Code

import javax.swing.*;

import java.awt.*;

import java.awt.event.MouseEvent;

import java.awt.event.MouseListener;

public class ComplexDemo extends JFrame {

public static void main(String args[]) {

JFrame frame = new JFrame("Complex demo");

JPanel panel = new JPanel();

frame.getContentPane();

JLabel label = new JLabel();

// The parameter should be the absolute path of the image file

ImageIcon img = new ImageIcon("<The absolute path of the image file>");

img.setImage(img.getImage().getScaledInstance(200,300,

Image.SCALE_DEFAULT));

// Add the image as the content of the label

label.setIcon(img);

label.addMouseListener(new MouseListener() {

private int click_time = 0;

@Override

public void mouseClicked(MouseEvent e) {

// When mouse click the image

click_time ++;

String msg = String.format("You choose Hearts three. You

clicked %d time(s).", click_time);

JOptionPane.showMessageDialog(null, msg, "Message",

JOptionPane.INFORMATION_MESSAGE);

}

@Override

public void mousePressed(MouseEvent e) {

// You can write the action when the mouse pressed on the image

// Leave blank if you don't want to use it

}

@Override

public void mouseReleased(MouseEvent e) {

// You can write the action when the mouse released from the

image

// Leave blank if you don't want to use it

}

@Override

public void mouseEntered(MouseEvent e) {

// You can write the action when the mouse enter the image

// Leave blank if you don't want to use it

}

@Override

public void mouseExited(MouseEvent e) {

// You can write the action when the mouse exit from the image

// Leave blank if you don't want to use it

}

What you got

After clicking the image for three times,

});

panel.add(label);

panel.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));

frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

frame.add(panel);

frame.setSize(800, 600);

frame.setVisible(true);

}

}

Good luck and have fun!