下拉框、列表框

• 下拉框

package com.sean.combobox;

import sun.misc.Perf;

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

/**
 *
 * @create 2021-03-03 15:33
 */
public class Demo extends JFrame {
    public static void main(String[] args) {
        new Demo();
    }

    public Demo() {
        Container container = this.getContentPane();

        JComboBox<Object> status = new JComboBox<>();

        status.addItem(null);
        status.addItem("正在热映");
        status.addItem("已下架");
        status.addItem("即将上映");

        container.add(status);

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

• 列表框

package com.sean.combobox;

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

/**
 *
 * @create 2021-03-03 15:38
 */
public class Demo02 extends JFrame {
    public static void main(String[] args) {
        new Demo02();
    }

    public Demo02() {
        Container container = this.getContentPane();

       //生成列表的内容
        //String[] contents = {"1","2","3"};

        Vector contents = new Vector();

        //列表汇总需要放内容
        JList jList = new JList(contents);
        contents.add("张三");
        contents.add("李四");
        contents.add("赵武");

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

• 应用场景
  • 选择地区，或者一些单个选项
  • 列表，展示信息，一般是动态扩容！