How to implement graphical interface in java, implementation of graphical interface in java

List of contents of this article:

• 1. How to use java to write an Application program with a graphical interface
• 2. Write a graphical interface program in Java
• 3. Write a graphical interface program in Java
• 4. The layout of java graphical interface
• 5. Writing graphical user interface programs in Java
• 6. How did JAVA’s graphical interface come about?

How to use it Writing a graphical interface Application program in java

Writing a graphical interface in java requires the use of swing and other components. You can install windowbuilder in eclipse to develop forms, automatically generate form code, and then modify it as needed, such as ：

package mainFrame;

import java.awt.EventQueue;

import java.awt.event.MouseAdapter;

import java .awt.event.MouseEvent;

import javax.swing.ImageIcon;

import javax.swing.JButton;

import javax.swing.JCheckBox;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax .swing.JPasswordField;

import javax.swing.JTextField;

import javax.swing.SwingConstants;

import javax.swing.UIManager;

import javax.swing.UnsupportedLookAndFeelException;

import javax.swing.border.EmptyBorder;

public class Mian_login extends JFrame {

private JPanel contentPane ;

private JTextField text_LoginName;

private JPasswordField Login_password;

/**

* Launch the application.

*/

public static void main(String[] args) {

EventQueue.invokeLater(new Runnable() {

@Override

public void run() {

try {

Mian_login frame = new Mian_login();

frame.setVisible(true);

p>

} catch (Exception e) {

e.printStackTrace();

}

}

}) ;

}

/**

* Create the frame.

*/

public Mian_login( ) {

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

setBounds(500, 200, 443, 300);

setResizable(false);

setTitle(“Login”);

/*Get the system button style*/

String lookAndFeel = UIManager.getSystemLookAndFeelClassName();

try {

UIManager.setLookAndFeel(lookAndFeel);

} catch (ClassNotFoundException e1) {

e1.printStackTrace();

} catch (InstantiationException e1) {

e1.printStackTrace();

} catch (IllegalAccessException e1) {

e1.printStackTrace();

} catch (UnsupportedLookAndFeelException e1) {

e1.printStackTrace();

}

cOntentPane= new JPanel();

contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));

setContentPane(contentPane);

contentPane.setLayout(null);

JPanel panel = new JPanel();

panel.setOpaque(false);

panel.setBounds(0, 0, 434, 272);

contentPane.add(panel);

panel.setLayout(null);

JButton btn_Login = new JButton(“\u767B\u5F55”);

btn_Login .addMouseListener(new MouseAdapter() {

@Override

public void mouseClicked(MouseEvent e) {

}

});

btn_Login.setBounds(88, 195, 70, 23);

panel.add(btn_Login);

JButton btn_cancel = new JButton(“\u53D6 \u6D88”);

btn_cancel.addMouseListener(new MouseAdapter() {

@Override

public void mouseClicked(MouseEvent e) {

dispose();

}

});

btn_cancel.setBounds(268, 195, 70, 23);

panel.add(btn_cancel);

JLabel lblNewLabel_name = new JLabel(“\u7528\u6237\u540D”);

lblNewLabel_name.setHorizontalAlignment(SwingConstants.CENTER);

lblNewLabel_name.setOpaque(true);

lblNewLabel_name.setBounds(88, 48, 70, 23);

panel.add(lblNewLabel_name);

JLabel lblNewLabel_passwd = new JLabel(“\u5BC6\u7801”);

lblNewLabel_passwd.setHorizontalAlignment(SwingConstants.CENTER);

lblNewLabel_passwd.setOpaque(true);

lblNewLabel_passwd.setBounds(88, 102, 70, 23);

panel.add(lblNewLabel_passwd);

JCheckBox chckbx_remember = new JCheckBox(“\u8BB0\u4F4F\u5BC6 \u7801”);

chckbx_remember.setBounds(102, 150, 84, 23);

panel.add(chckbx_remember);

text_LoginName = new JTextField ();

text_LoginName.setBounds(182, 48, 156, 23);

panel.add(text_LoginName);

text_LoginName.setColumns(10) ;

Login_password = new JPasswordField();

Login_password.setBounds(182, 102, 156, 23);

panel.add(Login_password);

JCheckBox chckbx_AutoLogin = new JCheckBox(“\u81EA\u52A8\u767B\u5F55”);

chckbx_AutoLogin.setBounds(233, 150, 84, 23);

panel.add(chckbx_AutoLogin);

JLabel Label_background = new JLabel(“”);

Label_background.setIcon(new ImageIcon(“E:\\JAVA_workplace\\0002-\ u754C\u9762\u8BBE\u8BA1\\images\\background3.jpg”));

Label_background.setBoageDialog(null, “Save successfully”);

tField1.setText(“”);

tField2.setText(“”);

tField3.setText (“”);

tField4.setText(“”);

tField5.setText(“”);

tField6.setText(“”);

tField7.setText(“”);

tField8.setText(“”);

tField9.setText(“”);

}

});

}

public static void main(String[]args){

new TestSwing() ;

}

private void createFile(String ipv,String portv,String addrv,String xx1v,String xx2v,String xx3v,String xx4v,String inputx,String inputxv){

StringBuffer cOntext= new StringBuffer();

context.append(“ip=”).append(ipv).append(“\n”);

context.append(“port=”).append(portv).append(“\n”);

context.append(“addr=”).append(addrv).append(“\n “);

context.append(“xx1=”).append(xx1v).append(“\n”);

context.append(“xx2=”). append(xx2v).append(“\n”);

context.append(“xx3=”).append(xx3v).append(“\n”);

context.append(“xx4=”).append(xx4v).append(“\n”);

context.append(inputx).append(“=”).append(inputxv).append (“”);

FileOutputStream fos = null;

try {

fos = new FileOutputStream(filepath);

fos. write(context.toString().getBytes());

} catch (Exception e) {

} finally {

if (fos != null )

try {

fos.close();

} catch (Exception e) {

}

}

}

}

Layout of java graphical interface

For those who have never used SWT, please provide a SWING:

The window uses JFrame (frame), and the layout is BorderLayout.

The top is JLabel (labelTop), with pictures and Text, use frame.add(labelTop, BorderLayout.NORTH) to add

The left is JPanel(panelLeft), the layout is BoxLayout, the parameter Y_AXIS. You need to set Layout to NULL when creating JPanel, and then create BoxLayout You need to pass the created panelLeft as a parameter, and then set the layout of panelLeft to that BoxLayout. Use frame.add(panelLeft, BorderLayout.WEST) to join

There are a bunch of JPanels with different functions in the middle. The layout is determined according to the functions. When the button is clicked, remove the panel in the middle of the frame (record in a variable panelCenter of its own), then add the panel corresponding to the button, and then store the added panel into the variable panelCenter.

Write a graphical user interface program in Java

The operation is as shown

The reference code is as follows

import java.awt.*;

import java. awt.event.*;

import javax.swing.*;

public class RegDemo extends JFrame implements ActionListener{

JTextField jtf;

JPasswordField jpf;

public RegDemo() {

//Creation and layout of components

JPanel jpc = new JPanel();// Default fluid layout

JPanel jp1 = new JPanel(new GridLayout(2, 2,5,10));//Grid layout

jp1.setBorder(BorderFactory.createTitledBorder( “User registration”));

JLabel jl1 = new JLabel(“Username:”);

jtf = new JTextField(10);

JLabel jl2 = new JLabel(“Password:”);

jpf = new JPasswordField(10);

jpf.setEchoChar(‘*’);//Use * to hide the password Display

jp1.add(jl1);jp1.add(jtf);

jp1.add(jl2);jp1.add(jpf);

jpc.add(jp1);

add(jpc);

JButton jb1 = new JButton(“Submit”);

jb1.addActionListener(this );

jb1.setActionCommand(“yes”);

JButton jb2 = new JButton(“cancel”);

jb2.addActionListener(this);

jb2.setActionCommand(“no”);

JPanel jp2 = new JPanel();

jp2.add(jb1);jp2.add(jb2 );

add(jp2,BorderLayout.SOUTH);

setTitle(“User registration interface”);

setSize(280, 280);

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setLocationRelativeTo(null);//The window is centered

setDefaultCloseOperation(EXIT_ON_CLOSE);//

setVisible(true);

}

public static void main(String[] args) {

new RegDemo();

}

@Override

public void actionPerformed(ActionEvent e) {

if(e.getActionCommand().equals(“yes”)){

String name = jtf.getText().trim ();

String pwd = new String(jpf.getPassword());

if(name.equals(“”)||pwd.equals(“”)){

JOptionPane.showMessageDialog(this, “You have not entered your username or password”);

}else{

JOptionPane.showMessageDialog(this, “Register Success! Username “+name+”, password “+pwd);

}

}else{

jtf.setText(“”);

p>

jpf.setText(“”);

}

}

}

How did the graphical interface of JAVA come out

, jdk contains many packages, each package has specific functions, the first one I learned was the lang package It is the basis of the language. utli is a practical package that provides random collection of date functions, etc., and the GUI comes from awt (abstract windows tool) and swing (slight window). These two packages provide all the controls needed for cross-section, such as Notepad. Anything can be made using the QQ interface. As for the applet, it is a small Java program. Use it to make some snakes or something. As for specific applications, you can go to the advanced Java tutorial. It also includes network interfaces, etc.

The GUI comes from awt (abstract windows tool) and swing (slight window). These two packages provide all the controls needed for cross-section. Notepad is a typical application. QQ interface can make anything. As for applet, it is a java small program. , use it to make some greedy snakes or something. As for specific applications, you can go to the Java Advanced Tutorial. It also includes network interfaces, etc.