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资源说明：简单实用的计算器，面板设计简单，
public testZ(){
super("计算器");
setSize(300,240);
Container con=getContentPane();
con.setLayout(new BorderLayout());
jPanel1=new JPanel();
jPanel1.setLayout(new GridLayout(1,1));
jPanel2=new JPanel();
jPanel2.setLayout(new GridLayout(4,4));
resultField=new JTextField("0");
jPanel1.add(resultField);
con.add(jPanel1,BorderLayout.NORTH);
s1=new JButton(" 1 "); s1.addActionListener(this);
s2=new JButton(" 2 "); s2.addActionListener(this);
s3=new JButton(" 3 "); s3.addActionListener(this);
s4=new JButton(" 4 "); s4.addActionListener(this);
s5=new JButton(" 5 "); s5.addActionListener(this);
s6=new JButton(" 6 "); s6.addActionListener(this);
s7=new JButton(" 7 "); s7.addActionListener(this);
s8=new JButton(" 8 "); s8.addActionListener(this);
s9=new JButton(" 9 "); s9.addActionListener(this);
s0=new JButton(" 0 "); s0.addActionListener(this);
b1=new JButton(" + "); b1.addActionListener(this);
b2=new JButton(" - "); b2.addActionListener(this);
b3=new JButton(" * "); b3.addActionListener(this);
b4=new JButton(" / "); b4.addActionListener(this);
f1=new JButton(" . "); f1.addActionListener(this);
f2=new JButton(" = "); f2.addActionListener(this);
jPanel2.add(s1);
jPanel2.add(s2);
jPanel2.add(s3);
jPanel2.add(b1);
jPanel2.add(s4);
jPanel2.add(s5);
jPanel2.add(s6);
jPanel2.add(b2);
jPanel2.add(s7);
jPanel2.add(s8);
jPanel2.add(s9);
jPanel2.add(b3);
jPanel2.add(s0);
jPanel2.add(f1);
jPanel2.add(f2);
jPanel2.add(b4);
con.add(jPanel2,BorderLayout.CENTER);
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