JList--setListData

最新推荐文章于 2024-02-17 16:29:22 发布

linuxtoproot

最新推荐文章于 2024-02-17 16:29:22 发布

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分类专栏： swing 容器文章标签： null vector constructor string import class

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本文介绍了一个使用Java Swing实现的简单图形界面应用案例，该应用包含一个列表组件(JList)和一个按钮组件(JButton)，通过按钮点击事件向列表中添加元素，并更新列表显示。

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import java.awt.event.MouseEvent;
import java.util.Vector;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JPanel;

public class A extends JFrame {

    private JPanel jContentPane = null;
    private JList jList = null;
    private JButton jButton = null;
    private Vector v = new Vector();
    /**
     * This method initializes jList
     *
     * @return javax.swing.JList
     */
    private JList getJList() {
        if (jList == null) {
            String s0 = "idle";   //初始化字符串idle，把它加入到vector向量中
            v.addElement(s0);
            jList = new JList(v);
            jList.setSelectionMode(javax.swing.ListSelectionModel.SINGLE_SELECTION);
            jList.setBounds(new java.awt.Rectangle(0,0,292,105));
        }
        return jList;
    }

    /**
     * This method initializes jButton
     *
     * @return javax.swing.JButton
     */
    private JButton getJButton() {
        if (jButton == null) {
            jButton = new JButton();
            jButton.setBounds(new java.awt.Rectangle(80,120,118,26));
            jButton.setText("Add");
            jButton.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(MouseEvent e){             //鼠标事件
                //public void mousePressed(java.awt.event.MouseEvent e) {
                    String s1 = "idle1";
                    v.addElement(s1);
                    jList.setListData(v);
               //JList.repaint();
                }
            });
        }
        return jButton;
    }

    /**
     * @param args
     */
    public static void main(String[] args) {
        new A();

}

    /**
     * This is the default constructor
     */
    public A() {
        super();
        initialize();
    }

    /**
     * This method initializes this
     *
     * @return void
     */
    private void initialize() {
        this.setSize(300, 200);
        this.setContentPane(getJContentPane());
        this.setTitle("JFrame");
        this.setVisible(true);
    }

    /**
     * This method initializes jContentPane
     *
     * @return javax.swing.JPanel
     */
    private JPanel getJContentPane() {
        if (jContentPane == null) {
            jContentPane = new JPanel();
            jContentPane.setLayout(null);
            jContentPane.add(getJList(), null);
            jContentPane.add(getJButton(), null);
        }
        return jContentPane;
    }

}