20.文本框、密码框、文本域

文本框：JTextField

package com.gui.lesson6;

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

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

        //文本框
        JTextField jTextField = new JTextField("hello");
        JTextField jTextField2 = new JTextField("world", 20);
        container.add(jTextField, BorderLayout.NORTH);
        container.add(jTextField2, BorderLayout.SOUTH);


        this.setVisible(true);
        this.setSize(300, 300);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

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

密码框：JPasswordField、setEchoChar

package com.gui.lesson6;

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

public class TestDemo2 extends JFrame {
    public TestDemo2() {
        Container container = getContentPane();

        //面板
        JPasswordField passwordField = new JPasswordField();//****
        passwordField.setEchoChar('*');

        container.add(passwordField);
        
        setVisible(true);
        setSize(500, 350);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

    }

    public static void main(String[] args) {
        new TestDemo2();
    }
}

文本域：JTextArea、配合面板JScrollPane使用、也是最常见的使用

package com.gui.lesson6;

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

public class TestDemo3 extends JFrame {
    public TestDemo3() {
        Container container = this.getContentPane();

        //文本域
        JTextArea textArea = new JTextArea(20, 50);
        textArea.setText("小朋友学习Java之路");

        //Scroll面板
        JScrollPane scrollPane = new JScrollPane(textArea);
        container.add(scrollPane);

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

    public static void main(String[] args) {
        new TestDemo3();
    }
}

一般文本域配合滚动面板使用，因为设置了行列，所以超过行列就会有滚动条