How to use JavaGUI menu bar, text, password and text field components

1.Menu bar

1.First-level menu bar

• Create menu bar JMenuBar

• Create menu JMenu

• Create menu item JMenuItem

Summary: menu item dependent menu, menu dependent menu Bar

• Create menu bar

• Create menu

• Create menu item

• MenuAdd a menu item

• Menu barAdd a menu

Example:

import javax.swing.*;
import java.awt.*;
public class Jmenu {
    public static void main(String[] args){
        JFrame jf=new JFrame("JMenu");
        jf.setBounds(400,300,400,200);
        jf.setLayout(new FlowLayout(FlowLayout.CENTER));
        JMenuBar bar=new JMenuBar();
        JMenu menu=new JMenu("菜单一");
        JMenuItem item=new JMenuItem("选项1");
        JMenuItem item2=new JMenuItem("选项2");
        JMenuItem item3=new JMenuItem("选项3");
        menu.add(item);
        menu.add(item2);
        menu.add(item3);
        bar.add(menu);
        jf.add(bar);
        jf.setVisible(true);
        jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}

2. Multi-level menu bar

• Create a menu bar

• Create multiple menus

• Create multiple menu items

• MenuAdd multiple menu items

• Add menu to menu bar

import javax.swing.*;
import java.awt.*;
public class Jmenu {
    public static void main(String[] args){
        JFrame jf=new JFrame("JMenu");
        jf.setBounds(400,300,400,200);
        jf.setLayout(new FlowLayout(FlowLayout.CENTER));
        JMenuBar bar=new JMenuBar();
        JMenu menu=new JMenu("菜单一");
        JMenu menu2=new JMenu("菜单二");
        JMenu menu3=new JMenu("菜单三");
        JMenuItem item=new JMenuItem("选项1");
        JMenuItem item2=new JMenuItem("选项2");
        JMenuItem item3=new JMenuItem("选项3");
        JMenuItem item4=new JMenuItem("选项4");
        JMenuItem item5=new JMenuItem("选项5");
        JMenuItem item6=new JMenuItem("选项6");
        menu.add(item);
        menu.add(item2);
        menu.add(item3);
        menu2.add(item4);
        menu3.add(item5);
        menu3.add(item6);
        bar.add(menu);
        bar.add(menu2);
        bar.add(menu3);
        jf.add(bar);
        jf.setVisible(true);
        jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}

Example:

##2. Text

Class: JTextField

Constructor:

new JTextField();

new JTextField(String text);//Specify the default text

new JTextField(int fieldWidth);//Specify the length of the text box

new JTextField(String text,int fieldWidth);//Specify the default text and specify the length of the text box

new JTextField( Documented docModel,String text, int fieldWidth);//Specify text box mode, specify default text, specify text box length

Example:

import javax.swing.*;
import java.awt.*;
public class JtextField {
    public static void main(String[] args){
        JFrame jf=new JFrame("JTextFiled");
        jf.setLayout(new FlowLayout(FlowLayout.CENTER));
        jf.setBounds(400,300,400,300);
        JTextField text=new JTextField("请输入",20);
        jf.add(text);
        jf.setVisible(true);
        jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}

3. Password box

Class: JPasswordField

Constructor:

new JPasswordField();

new JPasswordField(String text);/ /Specify the default text

new JPasswordField(int fieldWidth);//Specify the length of the text box

new JPasswordField(String text,int fieldWidth);//Specify the default text and specify the length of the text box

new JPasswordField(Documented docModel,String text, int fieldWidth);//Specify text box mode, specify default text, specify text box length

Other common methods:

• setEchoChar("*");//Set the echo character

Example:

import javax.swing.*;
import java.awt.*;
public class JpasswordField{
        public static void main(String[] args){
            JFrame jf=new JFrame("JTextFiled");
            jf.setLayout(new FlowLayout(FlowLayout.LEFT));
            jf.setBounds(400,300,400,300);
            JLabel jl=new JLabel("密码");
            JPasswordField password=new JPasswordField("",20);
            jf.add(jl);
            jf.add(password);
            jf.setVisible(true);
            jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        }
}

##4. Text area

Class: JTextArea

Constructor:

new JTextArea();

new JTextArea(String text);//Specify Default text

new JTextArea(int rows,int cols);//Specify rows and columns

new JTextFieldArea(Documented docModel);//Specify text box mode

new JTextArea( Documented docModel,String text, int rows,int cols);//Specify text box mode, specify default text, specify rows and columns

Other common methods:

setLineWrap ();//Set whether the text field will wrap automatically
Example:

import javax.swing.*;
import java.awt.*;
public class JtextArea {
    public static void main(String[] args) {
        JFrame jf = new JFrame("JTextArea");
        jf.setLayout(new FlowLayout(FlowLayout.LEFT));
        jf.setBounds(400, 300, 400, 300);
        JTextArea area=new JTextArea(20,10);
        area.setLineWrap(true);
        jf.add(area);
        jf.setVisible(true);
        jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}

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