java 计算器

待我称王封你为后i 2024-02-18 20:29 27阅读 0赞

package com.test;  
  
  
import javax.swing.\*;  
import java.awt.event.ActionEvent;  
import java.awt.event.ActionListener;  
import java.text.DecimalFormat;  
  
  
import static javax.swing.SwingConstants.RIGHT;  
  
  
/\*\*  
\* Created by Jason on 2018/5/24.  
\*/  
public class Rock extends JFrame implements ActionListener  
\{  
private JButton jButton\_Numbers\[\];  
private JButton jButton\_Point;  
private JButton jButton\_Plus;  
private JButton jButton\_Minus;  
private JButton jButton\_Multiply;  
private JButton jButton\_Divide;  
private JButton jButton\_Equal;  
private JPanel jPanel\_Main;  
private JTextField jTextField;  
private String firstParament;  
private String secondParament;  
private String jTextFieldString;  
private String jTextFieldValue;  
private Object lastOperation;  
  
  
public Rock()  
\{  
lastOperation= new Object();  
lastOperation=null;  
firstParament=new String("");  
secondParament=new String("");  
jTextFieldString=new String("");  
jTextFieldValue=new String("");  
jTextField=new JTextField(12);  
  
  
jButton\_Numbers=new JButton\[10\];  
jButton\_Plus=new JButton("+");  
jButton\_Point=new JButton(".");  
jButton\_Minus=new JButton("-");  
jButton\_Multiply=new JButton("\*");  
jButton\_Divide=new JButton("/");  
jButton\_Equal=new JButton("=");  
  
  
jPanel\_Main=new JPanel();  
for (int i = 0;i<10;i++)  
\{  
jButton\_Numbers\[i\] = new JButton(""+i);  
jPanel\_Main.add(jButton\_Numbers\[i\]);  
jButton\_Numbers\[i\].addActionListener(this);  
\}  
jPanel\_Main.add(jButton\_Point);  
jPanel\_Main.add(jButton\_Plus);  
jPanel\_Main.add(jButton\_Minus);  
jPanel\_Main.add(jButton\_Multiply);  
jPanel\_Main.add(jButton\_Divide);  
jPanel\_Main.add(jButton\_Equal);  
jPanel\_Main.add(jTextField);  
jTextField.setHorizontalAlignment(RIGHT);  
  
  
jButton\_Point.addActionListener(this);  
jButton\_Equal.addActionListener(this);  
jButton\_Plus.addActionListener(this);  
jButton\_Minus.addActionListener(this);  
jButton\_Multiply.addActionListener(this);  
jButton\_Divide.addActionListener(this);  
  
  
this.add(jPanel\_Main);  
  
  
this.setSize(500,300);  
this.setDefaultCloseOperation(JFrame.EXIT\_ON\_CLOSE);  
this.setVisible(true);  
  
  
\}  
  
  
private void setjTextField(String s)  
\{  
jTextField.setText(s);  
\}  
  
  
private String getjTextField()  
\{  
return jTextField.getText();  
\}  
  
  
private String getJButtonText(Object object)  
\{  
return ((JButton)object).getText();  
\}  
  
  
private void handleJButtonNumbers(Object object)  
\{  
if(jButton\_Equal == lastOperation)  
\{  
firstParament="";  
secondParament="";  
jTextFieldString="";  
\}  
jTextFieldValue = String.format("%s%s",jTextFieldString,getJButtonText(object));  
\}  
  
  
@Override  
public void actionPerformed(ActionEvent e)  
\{  
jTextFieldString=getjTextField();  
jTextFieldValue=new String("");  
Object object=e.getSource();  
for(int i=0;i<10;i++)  
\{  
if(jButton\_Numbers\[i\] == object)  
\{  
handleJButtonNumbers(object);  
\}  
\}  
if(getJButtonText(object).equals("."))  
\{  
handleJButtonNumbers(object);  
\}  
  
  
if( getJButtonText(object).equals("+")  
|| getJButtonText(object).equals("-")  
|| getJButtonText(object).equals("\*")  
|| getJButtonText(object).equals("/") )  
\{  
firstParament=getjTextField();  
jTextFieldValue = "";  
lastOperation=object;  
\}  
  
  
if(getJButtonText(object).equals("="))  
\{  
secondParament=jTextFieldString;  
float result=0.0f;  
  
  
firstParament = firstParament.equals("") ? "0" : firstParament;  
secondParament = secondParament.equals("") ? "0" : secondParament;  
  
  
switch (getJButtonText(lastOperation).charAt(0))  
\{  
case '+':  
result=parseFloat(firstParament)+parseFloat(secondParament);break;  
  
  
case '-':  
result=parseFloat(firstParament)-parseFloat(secondParament);break;  
  
  
case '\*':  
result=parseFloat(firstParament)\*parseFloat(secondParament);break;  
  
  
case '/':  
result=parseFloat(firstParament)/parseFloat(secondParament);break;  
  
  
default:  
System.out.println("default");  
\}  
DecimalFormat df = new DecimalFormat("\#\#\#.\#\#\#\#");  
jTextFieldValue = String.format(("%s"),df.format(result));  
firstParament="";  
secondParament="";  
lastOperation=object;  
\}  
setjTextField(jTextFieldValue);  
\}  
  
  
private float parseFloat(String s)  
\{  
return Float.parseFloat(s);  
\}  
\}