3、swing

relative AWT Image programming will be more advanced ,JFrame

3.1 window 、 panel

package com.zhang.lesson04;

import javax.swing.*;
import java.awt.*;

//init(); initialization 
public class JFrameDemo {
    
    public void init(){
    
        // Top window 
        JFrame jf = new JFrame(" This is a JFrame window ");
        jf.setVisible(true);
        jf.setBounds(100,100,200,200);
        jf.setBackground(Color.pink);// No display   Background color 
        // Set text  Jlabel
        JLabel label = new JLabel(" Welcome here ");
        jf.add(label);

        // Container instantiation 

        // Closing event 
        jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

    }
    public static void main(String[] args) {
    
        // Create a window 
        new JFrameDemo().init();
    }
}

The label is centered

package com.zhang.lesson04;

import javax.swing.*;
import java.awt.*;

public class JFrameDemo02 {
    
    public static void main(String[] args) {
    
        new MyJFrame2().init();
    }
}
class MyJFrame2 extends JFrame{
    
    public void init(){
    
        JLabel label = new JLabel(" Welcome here ");
        this.add(label);
        // Center text labels 
        label.setHorizontalAlignment(SwingConstants.CENTER);
        this.setVisible(true);
        this.setBounds(10,10,200,300);
        // Get the container 
        Container container = this.getContentPane();
        container.setBackground(Color.blue);
    }
}

Closing event

Easier

    // Closing event 
    jf.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

}

3.2 Popup

JDialog, Used to be ejected , By default, there is a close event

Warning

reason ： The pop-up window has been closed by default , Repeatedly set

package com.zhang.lesson04;

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

// main window 
public class DialogDemo extends JFrame {
    
    public DialogDemo()  {
    
        this.setVisible(true);
        this.setSize(700,500);

        // this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        //JFrame Put things , Containers 
        Container container = this.getContentPane();
        // Absolute layout 
        container.setLayout(null);
        // Button 
        JButton button = new JButton(" Click to pop up a dialog box ");// establish 
        button.setBounds(30,30,200,50);
        // When you click this button , Pop up a pop-up window 
        button.addActionListener(new ActionListener() {
    // Monitor 
            @Override
            public void actionPerformed(ActionEvent e) {
    
                // Popup 
                new MyDialogDemo();
            }
        });
        container.add(button);
    }

    public static void main(String[] args) {
    
        new DialogDemo();
    }
}
// Pop up window 
class MyDialogDemo extends JDialog{
    
    public MyDialogDemo() {
    
        this.setVisible(true);
        this.setBounds(100,100,500,500);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        Container container = this.getContentPane();
        container.setLayout(null);
        container.add(new Label(" Learn together java"));
    }
}

3.3 label

label

new JLabel("xxx");

ICON

Icon

package com.zhang.lesson04;

import javax.swing.*;
import java.awt.*;

// Icon , Need to implement class ,Frame Inherit 
public class IconDemo extends JFrame implements Icon {
    

    private  int width;
    private  int height;
    public IconDemo(){
    }// No arguments structure 


    public IconDemo(int width,int height){
    
        this.width=width;
        this.height=height;
    }

    public void init(){
    
        IconDemo iconDemo = new IconDemo(15, 15);
        // The icon is on the label , It can also be placed on the button ！
        JLabel label = new JLabel("icontest", iconDemo, SwingConstants.CENTER);
        Container container = getContentPane();
        container.add(label);

        this.setVisible(true);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }
    public static void main(String[] args) {
    
        new IconDemo().init();
    }

    @Override
    public void paintIcon(Component c, Graphics g, int x, int y) {
    
        g.fillOval(x,y,width,height);
    }

    @Override
    public int getIconWidth() {
    
        return this.width;
    }

    @Override
    public int getIconHeight() {
    
        return this.height;
    }
}

picture

package com.zhang.lesson04;

import sun.misc.PostVMInitHook;

import javax.swing.*;
import java.awt.*;
import java.net.URL;

public class ImageIconDemo extends JFrame {
    
    public ImageIconDemo()  {
    
        // Get the address of the picture 
        JLabel label = new JLabel("ImageIcon");
        URL url = ImageIconDemo.class.getResource(" Protogod .png");
        // obtain   At present class This class   The following peer resources   Of   Name file 
        ImageIcon imageIcon = new ImageIcon(url);
        label.setIcon(imageIcon);
        label.setHorizontalAlignment(SwingConstants.CENTER);
        Container container = getContentPane();
        container.add(label);

        setBounds(100,100,200,200);
        setVisible(true);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

    public static void main(String[] args) {
    
        new ImageIconDemo();
    }
}

3.4 panel

JPanel

package com.zhang.lesson05;

import javax.swing.*;
import java.awt.*;

public class JPanelDemo extends JFrame {
    
    public JPanelDemo() {
    
        Container container = this.getContentPane();
        container.setLayout(new GridLayout(2,1,10,10));
        // The following parameters mean , Spacing between each panel 
        JPanel panel1 = new JPanel(new GridLayout(1,3));
        JPanel panel2 = new JPanel(new GridLayout(1,2));
        JPanel panel3 = new JPanel(new GridLayout(2,1));
        JPanel panel4 = new JPanel(new GridLayout(3,2));

        panel1.add(new JButton("1"));
        panel1.add(new JButton("1"));
        panel1.add(new JButton("1"));
        panel2.add(new JButton("2"));
        panel2.add(new JButton("2"));
        panel3.add(new JButton("3"));
        panel3.add(new JButton("3"));
        panel4.add(new JButton("4"));
        panel4.add(new JButton("4"));
        panel4.add(new JButton("4"));
        panel4.add(new JButton("4"));
        panel4.add(new JButton("4"));
        panel4.add(new JButton("4"));

        container.add(panel1);
        container.add(panel2);
        container.add(panel3);
        container.add(panel4);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        this.setVisible(true);
        this.setSize(500,500);
    }

    public static void main(String[] args) {
    

        new JPanelDemo();
    }
}

JScrollPanel A drop-down box , Realization of cross pull frame

package com.zhang.lesson05;

import javax.swing.*;
import java.awt.*;

public class JScrollDemo extends JFrame {
    
    public JScrollDemo()  {
    
        Container container = this.getContentPane();

        // Text domain 
        JTextArea textArea = new JTextArea(20, 50);
        // Each line can only write 20 A digital ,50 Column 
        textArea.setText(" Welcome to learn java");// Set the default text field 
        //d Throw it into the panel , Then throw the panel into   In the container 
        //Scroll panel 
        JScrollPane scrollPane = new JScrollPane(textArea);
        container.add(scrollPane);// A drop-down box , Realization of cross pull frame 
        this.setVisible(true);
        this.setBounds(100,100,300,350);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

    public static void main(String[] args) {
    
        new JScrollDemo();
    }
}

3.5 Button

Picture button

package com.zhang.lesson05;

import javax.swing.*;
import java.awt.*;
import java.net.URL;

public class JButtonDemo01 extends JFrame {
    
    public JButtonDemo01()  {
    
        Container container = this.getContentPane();
        URL resource = JButtonDemo01.class.getResource(" Protogod .png");
        Icon icon=new ImageIcon(resource);// Turn the picture into an icon 
        // Put the icon on the button 
        JButton button = new JButton();
        button.setIcon(icon);

        button.setToolTipText(" Picture button ");// Mouse on top   The text... Will be displayed 

        // Put the button on the container 
        container.add(button);

        this.setVisible(true);
        this.setBounds(500,300,260,260);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

    public static void main(String[] args) {
    
        new JButtonDemo01();
    }
}

Radio button （ grouping ）

package com.zhang.lesson05;

import javax.swing.*;
import java.awt.*;
import java.net.URL;

public class JButtonDemo02 extends JFrame {
    
    public JButtonDemo02()  {
    
        Container container = this.getContentPane();
        URL resource = JButtonDemo01.class.getResource(" Protogod .png");
        Icon icon=new ImageIcon(resource);// Turn the picture into an icon 

        // Radio buttons 
        JRadioButton jRadioButton01 = new JRadioButton("JRadioButton01");
        JRadioButton jRadioButton02 = new JRadioButton("JRadioButton02");
        JRadioButton jRadioButton03 = new JRadioButton("JRadioButton03");
        // Because only one radio box can be selected , Divide into groups , You can only choose one from a group 
        ButtonGroup group = new ButtonGroup();
        group.add(jRadioButton01);
        group.add(jRadioButton02);
        group.add(jRadioButton03);

        container.add(jRadioButton01,BorderLayout.CENTER);
        container.add(jRadioButton02,BorderLayout.NORTH);
        container.add(jRadioButton03,BorderLayout.SOUTH);
        this.setVisible(true);
        this.setBounds(500,300,260,260);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

    public static void main(String[] args) {
    
        new JButtonDemo02();
    }
}

Check button

package com.zhang.lesson05;

import javax.swing.*;
import java.awt.*;
import java.net.URL;

public class JButtonDemo03 extends JFrame {
    
    public JButtonDemo03()  {
    
        Container container = this.getContentPane();
        URL resource = JButtonDemo01.class.getResource(" Protogod .png");
        Icon icon=new ImageIcon(resource);// Turn the picture into an icon 

        // Checkbox 
        JCheckBox checkBox01 = new JCheckBox("checkBox01");
        JCheckBox checkBox02 = new JCheckBox("checkBox02");

        container.add(checkBox01,BorderLayout.SOUTH);
        container.add(checkBox02,BorderLayout.NORTH);
        


        this.setVisible(true);
        this.setBounds(500,300,260,260);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

    public static void main(String[] args) {
    
        new JButtonDemo03();
    }
}

3.6 list

A drop-down box JComboBox

package com.zhang.lesson06;

import javax.swing.*;
import java.awt.*;

public class TestComboboxDemo01 extends JFrame {
    
    public TestComboboxDemo01()  {
    
        Container container = getContentPane();

        JComboBox status = new JComboBox<>();
        status.addItem(null);
        status.addItem(" Is hit ");
        status.addItem(" It's off the shelf ");
        status.addItem(" To be shown soon ");


        container.add(status);
        this.setVisible(true);
        this.setSize(500,350);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

    public static void main(String[] args) {
    
        new TestComboboxDemo01();
    }
}

List box

Application scenarios

• Select region , Or some single option
• list , Display information , It's usually dynamic expansion

package com.zhang.lesson06;

import javax.swing.*;
import java.awt.*;
import java.util.Vector;

public class TestComboboxDemo02 extends JFrame {
    
    public TestComboboxDemo02()  {
    
        Container container = getContentPane();

       // Generate the contents of the list   Sparse array , compressed data 
        // String[] contents={"1","2","3"};

        Vector contents = new Vector();
        // What needs to be put in the list 
        JList jList = new JList(contents);

        contents.add("zhangsan");
        contents.add("lisi");
        contents.add("wangwu");
        container.add(jList);
        this.setVisible(true);
        this.setSize(500,350);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

    public static void main(String[] args) {
    
        new TestComboboxDemo02();
    }
}

3.7 The text box

The text box JTextField

package com.zhang.lesson06;

import javax.swing.*;
import java.awt.*;
import java.util.Vector;

public class TestTextDemo01 extends JFrame {
    
    public TestTextDemo01()  {
    
        Container container = getContentPane();

        JTextField textField = new JTextField("hello");
        JTextField textField2 = new JTextField("world",20);//columns Maximum characters allowed 
        container.add(textField,BorderLayout.NORTH);
        container.add(textField2,BorderLayout.SOUTH);
        this.setVisible(true);
        this.setSize(500,350);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

    public static void main(String[] args) {
    
        new TestTextDemo01();
    }
}

Password box JPasswordField

package com.zhang.lesson06;

import javax.swing.*;
import java.awt.*;

public class TestTextDemo02 extends JFrame {
    
    public TestTextDemo02()  {
    
        Container container = getContentPane();

        JPasswordField passwordField = new JPasswordField();// Default ****
        passwordField.setEchoChar('*');
        container.add(passwordField);
        this.setVisible(true);
        this.setSize(500,350);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

    public static void main(String[] args) {
    
        new TestTextDemo02();
    }
}

Text domain JTextArea

package com.zhang.lesson05;

import javax.swing.*;
import java.awt.*;

public class JScrollDemo extends JFrame {
    
    public JScrollDemo()  {
    
        Container container = this.getContentPane();

        // Text domain 
        JTextArea textArea = new JTextArea(20, 50);
        // Each line can only write 20 A digital ,50 Column 
        textArea.setText(" Welcome to learn java");// Set the default text field 
        //d Throw it into the panel , Then throw the panel into   In the container 
        //Scroll panel 
        JScrollPane scrollPane = new JScrollPane(textArea);
        container.add(scrollPane);// A drop-down box , Realization of cross pull frame 
        this.setVisible(true);
        this.setBounds(100,100,300,350);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

    public static void main(String[] args) {
    
        new JScrollDemo();
    }
}