Java 入门图形用户界面设计之列表框JList

目录

• 列表框JList
• 使用ListModel构造JList
• JList事件处理

Java程序设计 图形用户界面 【十一】列表框JList

列表框JList

JList常用方法

可以通过ListSelectionModel接口完成列表框是多选还是单选

ListSelectionModel定义的常量

import javax.swing.*;
import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.Vector;

class MyList{
    private JFrame frame = new JFrame("一");
    private Container cont = frame.getContentPane();
    private JList list1 = null;
    private JList list2 = null;
    public MyList(){
        this.frame.setLayout(new GridLayout(1,3));
        String n[] = {"A","B","C","D","E","F"};
        Vector<String> v = new Vector<String>();
        v.add("A");
        v.add("B");
        v.add("C");
        this.list1 = new JList(n);
        this.list2 = new JList(v);
        list1.setBorder(BorderFactory.createTitledBorder("请选择"));
        list2.setBorder(BorderFactory.createTitledBorder("请选择"));
        list1.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
        list2.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        cont.add(this.list1);
        cont.add(this.list2);
        this.frame.setSize(300,200);
        this.frame.setVisible(true);
        this.frame.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                super.windowClosing(e);
                System.exit(1);
            }
        });
    }
}
public class Hello {
    public static void main(String[] args) {
        new MyList();
    }
}

第一个JList通过字符串数组设置列表的内容，并通过setSelectionMode()方法设置一次性可以选择多个选项

第二个JList通过Vector设置列表的内容，并通过setSelectionMode()方法将其设置成每次只能选择一个选项

使用ListModel构造JList

ListModel是一个专门用于创建JList列表内容操作的接口

import javax.swing.*;
import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

class MyListModel extends AbstractListModel{
    private String n[]={"A","B","C","D"};

    @Override
    public int getSize() {
        return this.n.length;
    }

    public Object getElementAt(int ind){
        if(ind<this.n.length){
            return this.n[ind];
        }else {
            return null;
        }
    }
}
class MyList{
    private JFrame frame = new JFrame("一");
    private Container cont = frame.getContentPane();
    private JList list1 =null;
    public MyList(){
        this.list1 = new JList(new MyListModel());
        list1.setBorder(BorderFactory.createTitledBorder("请选择"));
        list1.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
        cont.add(this.list1);
        this.frame.setSize(300,200);
        this.frame.setVisible(true);
        this.frame.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                super.windowClosing(e);
                System.exit(1);
            }
        });
    }
}
public class Hello {
    public static void main(String[] args) {
        new MyList();
    }
}

JList事件处理

使用ListSelectionListener的监听接口实现对JList中所选项的监听

ListSelectionListener接口定义的方法

ListSelectionEvent的常用方法

对JList进行监听

import javax.swing.*;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

class MyListModel extends AbstractListModel{
    private String n[]={"A","B","C","D"};

    @Override
    public int getSize() {
        return this.n.length;
    }

    public Object getElementAt(int ind){
        if(ind<this.n.length){
            return this.n[ind];
        }else {
            return null;
        }
    }
}
class MyList implements ListSelectionListener {
    private JFrame frame = new JFrame("一");
    private Container cont = frame.getContentPane();
    private JList list1 =null;
    public MyList(){
        this.list1 = new JList(new MyListModel());
        list1.setBorder(BorderFactory.createTitledBorder("请选择"));
        list1.setSelectionMode(ListSelectionModel.MULTIPLE_INTERVAL_SELECTION);
        list1.addListSelectionListener(this);
        cont.add(this.list1);
        this.frame.setSize(300,200);
        this.frame.setVisible(true);
        this.frame.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                super.windowClosing(e);
                System.exit(1);
            }
        });
    }

    @Override
    public void valueChanged(ListSelectionEvent e) {
        int temp[] = list1.getSelectedIndices();
        System.out.print("选的的内容是：");
        for(int i:temp){
            System.out.print(list1.getModel().getElementAt(i)+",");
        }
        System.out.println();
    }
}
public class Hello {
    public static void main(String[] args) {
        new MyList();
    }
}

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