这个程序不是完全自己写的，是看着网上的东西，一点一点抠出来的。希望和大家交流一下
import java.awt.*;
import java.awt.event.*;
import java.util.EventObject;

public class CalculatorGUI{
private Frame f;
private Panel p1,p2;
private Button b0,b1,b2,b3,b4,b5,b6,b7,b8,b9;
private Button bPoint,bAdd,bDec,bMul,bDiv,bCal;
private TextField tf;
private String s,op;
private Calculator cal = new Calculator();
private boolean ifOp;

public CalculatorGUI(){
f = new Frame("Calculator");
p1 = new Panel();
p2 = new Panel();

b0 = new Button("0");
b1 = new Button("1");
b2 = new Button("2");
b3 = new Button("3");
b4 = new Button("4");
b5 = new Button("5");
b6 = new Button("6");
b7 = new Button("7");
b8 = new Button("8");
b9 = new Button("9");
bPoint = new Button(".");
bAdd = new Button("+");
bDec = new Button("-");
bMul = new Button("*");
bDiv = new Button("/");
bCal = new Button("=");

tf = new TextField(25);
tf.setEditable(false);


}

public void launchFrame(){
f.setSize(220,160);
f.setResizable(false);
f.addWindowListener(new myWindowListener());
p1.setLayout(new FlowLayout(FlowLayout.CENTER));
p1.add(tf);
f.add(p1,BorderLayout.NORTH);
p2.setLayout(new GridLayout(4,4));

b0.addActionListener(new setLabelText_ActionListener());
b1.addActionListener(new setLabelText_ActionListener());
b2.addActionListener(new setLabelText_ActionListener());
b3.addActionListener(new setLabelText_ActionListener());
b4.addActionListener(new setLabelText_ActionListener());
b5.addActionListener(new setLabelText_ActionListener());
b6.addActionListener(new setLabelText_ActionListener());
b7.addActionListener(new setLabelText_ActionListener());
b8.addActionListener(new setLabelText_ActionListener());
b9.addActionListener(new setLabelText_ActionListener());
bPoint.addActionListener(new setLabelText_ActionListener());
bAdd.addActionListener(new setOperator_ActionListener());
bDec.addActionListener(new setOperator_ActionListener());
bMul.addActionListener(new setOperator_ActionListener());
bDiv.addActionListener(new setOperator_ActionListener());
bCal.addActionListener(new setOperator_ActionListener());

p2.add(b7);
p2.add(b8);
p2.add(b9);
p2.add(bAdd);
p2.add(b4);
p2.add(b5);
p2.add(b6);
p2.add(bDec);
p2.add(b1);
p2.add(b2);
p2.add(b3);
p2.add(bMul);
p2.add(b0);
p2.add(bPoint);
p2.add(bCal);
p2.add(bDiv);
f.add(p2,BorderLayout.SOUTH);
f.setVisible(true);
}

public void setTextFieldText_Temp(){
if (tf.getText().length()<15 && (tf.getText().indexOf(".")==-1 || !s.equals("."))){
tf.setText(tf.getText()+s);
}else{
tf.setText((tf.getText()+s).substring(0,15));
}
}
public void setTextFieldText(){
if(ifOp){
ifOp = false;
tf.setText("");
setTextFieldText_Temp();
}else{
setTextFieldText_Temp();
}
}

public static void main(String[] args){
CalculatorGUI calculator = new CalculatorGUI();
calculator.launchFrame();
}

class myWindowListener extends WindowAdapter{
public void windowClosing(WindowEvent e){
System.exit(0);
}
}

class setLabelText_ActionListener implements ActionListener{
public void actionPerformed(ActionEvent e){
Button tempB = (Button)e.getSource();
s = tempB.getLabel();
setTextFieldText();
}
}

class setOperator_ActionListener implements ActionListener{
public void actionPerformed(ActionEvent e){
Button tempB = (Button)e.getSource();
op = tempB.getLabel();
if(op.equals("+")){
tf.setText(cal.opAdd(tf.getText()));
ifOp = true;
}else if(op.equals("-")){
tf.setText(cal.opSubtract(tf.getText()));
ifOp = true;
}else if(op.equals("*")){
tf.setText(cal.opMultiply(tf.getText()));
ifOp = true;
}else if(op.equals("/")){
tf.setText(cal.opDivide(tf.getText()));
ifOp = true;
}else if(op.equals("=")){
tf.setText(cal.opEquals(tf.getText()));
ifOp = true;
}
}
}
}

很好，很强大，收藏一下

前来围观大神 已收藏

谁来说说这个程序难度有多大？

很强大，收藏一下

好屌的样子！  我还没学到那呢。。。。。。。。