TextAndButton.java:59: addFocusListener(java.awt.event.FocusListener) in java.aw
t.Component cannot be applied to (javax.swing.JButton)
b1.addFocusListener(b1);
应该怎么办,thx
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入门问题:JButton 对象不能addFocusListener,应该怎么处理
编译错误: TextAndButton.java:59: addFocusListener(java.awt.event.FocusListener) in java.aw t.Component cannot be applied to (javax.swing.JButton) b1.addFocusListener(b1); 应该怎么办,thx