private JButton jBtnDrawCircle = new JButton("Circle");
private JButton jBtnDrawSquare = new JButton("Square");
private JButton jBtnDrawTriangle = new JButton("Triangle");
private JButton jBtnSelection = new JButton("Selection");
private JButton jBtnDrawCircle = new JButton("C
阅读背景：
如何将ActionListener添加到Java中的JButton中
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