import java.awt.*; import java.awt.event.*; import java.lang.*; import javax.swing.*; public class Counter extends Frame { //声明三个面板的布局GridLayout gl1,gl2,gl3;Panel p0,p1,p2,p3;JTextField tf1;TextField tf2;JButton b0,b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11,b12,b13,b14,b15,b16,b17,b18,b19,b20,b21,b22,b23,b2...
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