java - Java swing 中单击的 JButton 的返回索引

Question

我有以下 Java 代码:我有一个 for 循环，并且正在创建 JButton。我想返回单击按钮的索引。所以我使用:

    JButton jbtn = (JButton) e.getSource();

是否有返回 JButton 索引的方法？

我的代码如下:

for (int button = 0 ; button <= ListofJButtons.size() - 1; button++) {

    ListofJButtons.get(button).addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            System.out.println("I clicked on button !");
            JButton buttonSource = (JButton) e.getSource();
            System.out.println( " sourceButton " + buttonSource.getIndex()); //is there any method like that in Java?
        }
    } );

}//for loop

是否可以获取被点击的JButton的Index？

谢谢

Answer 1

有几种方法。最简单的做法是:

for (int button = 0 ; button <= ListofJButtons.size() - 1; button++) {
    final int index = button;
    ListofJButtons.get(button).addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            // Because index is final I can access it here and know the index
            System.out.println("I clicked on button "+index+"!");
            JButton buttonSource = (JButton) e.getSource();
            System.out.println( " sourceButton " + buttonSource.getIndex()); //is there any method like that in Java?
        }
    } );
}//for loop

另一种最简单的方法就是执行ListofJButtons.indexOf(buttonSource)。