关于用java程序编写一个简单的计算器

Question

请教高手,将我编写的这段程序按这个大体思路修改下让它能运行..不胜感激...
拜托各位了,是要教的重要作业,不要随便贴个看不懂的相关程序,因为是刚学java不久.

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class CalculatorFrame extends JFrame
{ Jpanel jp1,jp2;
JTextField text_number;
JButton jb1,jb2,jb3,jb4,jb5,jb6,jb7,jb8,jb9,jb10,jb11,jb12,jb13,jb14,jb15,jb16,button_cancel;
public CalculatorFrame()
{
super("学号 120052480 ");
container cp=getcontentpane();
cp.setBackground(color.blue);
cp.setLayout(null);
this.add(cp);

jp1=new Jpanel();
jp1.setLayout(null);
jp1.setBound(300,240,360,200);
cp.add(jp1);

jp2=new Jpanel();
jp2.setLayout(null);
jp2.setBound();
cp.add(jp2);

text_number=new JTextField("1");
text_number.setEditable(false);
jp.add(text_number);

JButton jb1=new JButton("1");
JButton jb2=new Jbutton("2");
JButton jb3=new JButton("3");
JButton jb4=new JButton("4");
JButton jb5=new JButton("5");
JButton jb6=new JButton("6");
JButton jb7=new JButton("7");
JButton jb8=new JButton("8");
JButton jb9=new JButton("9");
JButton jb10=new JButton(".");
JButton jb11=new JButton("0");
JButton jb12=new JButton("+");
JButton jb13=new JButton("-");
JButton jb14=new JButton("*");
JButton jb15=new JButton("/");
JButton jb16=new JButton("=");
JButton button_cancel=new Jbutton("C");
cp.add(jb1);
cp.add(jb2);
cp.add(jb3);
cp.add(jb4);
cp.add(jb5);
cp.add(jb6);
cp.add(jb7);
cp.add(jb8);
cp.add(jb9);
cp.add(jb10);
cp.add(jb11);
cp.add(jb12);
cp.add(jb13);
cp.add(jb14);
cp.add(jb15);
cp.add(jb16);
cp.add(button_cancel);

Answer 1

public class Calculator{
private String result = "0";
private int op = 0,add = 1,sub = 2,mul = 3,div = 4;

private double stringToDouble(String x){
double y = Double.parseDouble(x);
return y;
}
private void operate(String x){
double x1 = stringToDouble(x);
double y = stringToDouble(result);
switch (op){
case 0:
result = x;
break;
case 1:
result = String.valueOf(y+x1);
break;
case 2:
result = String.valueOf(y-x1);
break;
case 3:
result = String.valueOf(y*x1);
break;
case 4:
if(x1!=0){
result = String.valueOf(y/x1);
}else{
result = "The divisor can't be zero!";
}
break;
}
}

public String opAdd(String x){
operate(x);
op = add;
return result;
}
public String opSubtract(String x){
operate(x);
op = sub;
return result;
}
public String opMultiply(String x){
operate(x);
op = mul;
return result;
}
public String opDivide(String x){
operate(x);
op = div;
return result;
}
public String opEquals(String x){
operate(x);
op = 0;
return result;
}
public void opClean(){
op = 0;
result = "0";
}
}
__________
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;
}
}
}
}

两个class 你自己运行一下吧本回答被网友采纳