e649. 处理焦点改变事件

component.addFocusListener(new MyFocusListener());

    public class MyFocusListener extends FocusAdapter {
        public void focusGained(FocusEvent evt) {
            // The component gained the focus
        }
        public void focusLost(FocusEvent evt) {
            // The component lost the focus
        }
    }

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