java课程设计---计算器 要求如下：

Question

计算器所遵循的计算规则与Windows2000/XP系统中的“计算器”相同，除了具有普通的计算功能外，还具有显示计算过程、保存计算过程之功能。（1） 单击“计算器”上的数字按钮（0、1、2、3、4、5、6、7、8、9）可以设置参与计算的运算数。（2） 单击“计算器”上的运算符按钮（+、-、*、/）可以选择运算符号。（3） 单击“计算器”上的函数按钮可以计算出相应的函数值。（4） 单击“计算器”上的“=”按钮显示计算结果。（5） 在一个文本框中显示当前的计算过程，在一个文本区中显示以往的计算过程。（6） 单击“保存”按钮可以将文本区中的全部计算过程保存到文件；单击“复制”按钮可以将文本区中的文本复制到剪贴板；单击“清除”按钮可以清除文本区中的全部内容。

Answer 1

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
import java.util.LinkedList;
import java.io.*;
public class CalculatorWindow extends JFrame implements ActionListener{
NumberButton numberButton[];
OperationButton operationButton[];
JButton 小数点操作,正负号操作,退格操作,等号操作,清零操作,sin;
JTextField resultShow; //显示计算结果
JTextField showComputerProcess; //显示当前计算过程
JTextArea saveComputerProcess; //显示计算步骤
JButton saveButton,copyButton,clearButton;
LinkedList<String> list; //链表用来存放第一个运算数、运算符号和第二个运算数
HandleDigit handleDigit; //负责处理ActionEvent事件
HandleOperation handleOperation ;
HandleBack handleBack;
HandleClear handleClear;
HandleEquality handleEquality;
HandleDot handleDot;
HandlePOrN handlePOrN;
HandleSin handleSin;
public CalculatorWindow(){
setTitle("计算器");
JPanel panelLeft,panelRight;
list=new LinkedList<String>();
resultShow=new JTextField(10);
resultShow.setHorizontalAlignment(JTextField.RIGHT);
resultShow.setForeground(Color.blue);
resultShow.setFont(new Font("TimesRoman",Font.BOLD,16));
resultShow.setBorder(new SoftBevelBorder(BevelBorder.LOWERED));
resultShow.setEditable(false);
resultShow.setBackground(Color.white);
showComputerProcess=new JTextField();
showComputerProcess.setHorizontalAlignment(JTextField.CENTER);
showComputerProcess.setFont(new Font("Arial",Font.BOLD,16));
showComputerProcess.setBackground(Color.cyan);
showComputerProcess.setEditable(false);
saveComputerProcess=new JTextArea();
saveComputerProcess.setEditable(false);
saveComputerProcess.setFont(new Font("宋体",Font.PLAIN,16));
numberButton=new NumberButton[10];
handleDigit=new HandleDigit(list,resultShow,showComputerProcess);
for(int i=0;i<=9;i++){
numberButton[i]=new NumberButton(i);
numberButton[i].setFont(new Font("Arial",Font.BOLD,20));
numberButton[i].addActionListener(handleDigit);
}
operationButton=new OperationButton[4];
handleOperation=new HandleOperation(list,resultShow,
showComputerProcess,saveComputerProcess);
String 运算符号[]={"+","-","*","/"};
for(int i=0;i<4;i++){
operationButton[i]=new OperationButton(运算符号[i]);
operationButton[i].setFont(new Font("Arial",Font.BOLD,20));
operationButton[i].addActionListener(handleOperation);
}
小数点操作=new JButton(".");
handleDot=new HandleDot(list,resultShow,showComputerProcess);
小数点操作.addActionListener(handleDot);
正负号操作=new JButton("+/-");
handlePOrN=new HandlePOrN(list,resultShow,showComputerProcess);
正负号操作.addActionListener(handlePOrN);
等号操作=new JButton("=");
handleEquality=new HandleEquality(list,resultShow,
showComputerProcess,saveComputerProcess);
等号操作.addActionListener(handleEquality);
sin=new JButton("sin");
handleSin=new HandleSin(list,resultShow,
showComputerProcess,saveComputerProcess);
sin.addActionListener(handleSin);
退格操作=new JButton("退格");
handleBack=new HandleBack(list,resultShow,showComputerProcess);
退格操作.addActionListener(handleBack);
清零操作=new JButton("C");
handleClear=new HandleClear(list,resultShow,showComputerProcess);
清零操作.addActionListener(handleClear);
清零操作.setForeground(Color.red);
退格操作.setForeground(Color.red);
等号操作.setForeground(Color.red);
sin.setForeground(Color.blue);
正负号操作.setForeground(Color.blue);
小数点操作.setForeground(Color.blue);
panelLeft=new JPanel();
panelRight=new JPanel();
panelLeft.setLayout(new BorderLayout());
JPanel centerInLeft=new JPanel();
panelLeft.add(resultShow,BorderLayout.NORTH);
panelLeft.add(centerInLeft,BorderLayout.CENTER);
centerInLeft.setLayout(new GridLayout(4,5));
centerInLeft.add(numberButton[1]);
centerInLeft.add(numberButton[2]);
centerInLeft.add(numberButton[3]);
centerInLeft.add(operationButton[0]);
centerInLeft.add(清零操作);
centerInLeft.add(numberButton[4]);
centerInLeft.add(numberButton[5]);
centerInLeft.add(numberButton[6]);
centerInLeft.add(operationButton[1]);
centerInLeft.add(退格操作);
centerInLeft.add(numberButton[7]);
centerInLeft.add(numberButton[8]);
centerInLeft.add(numberButton[9]);
centerInLeft.add(operationButton[2]);
centerInLeft.add(sin);
centerInLeft.add(numberButton[0]);
centerInLeft.add(正负号操作);
centerInLeft.add(小数点操作);
centerInLeft.add(operationButton[3]);
centerInLeft.add(等号操作);
panelRight.setLayout(new BorderLayout());
panelRight.add(showComputerProcess,BorderLayout.NORTH);
saveButton=new JButton("保存");
copyButton=new JButton("复制");
clearButton=new JButton("清除");
saveButton.setToolTipText("保存计算过程到文件");
copyButton.setToolTipText("复制选中的计算过程");
clearButton.setToolTipText("清除计算过程");
saveButton.addActionListener(this);
copyButton.addActionListener(this);
clearButton.addActionListener(this);
panelRight.add(new JScrollPane(saveComputerProcess),BorderLayout.CENTER);
JPanel southInPanelRight=new JPanel();
southInPanelRight.add(saveButton);
southInPanelRight.add(copyButton);
southInPanelRight.add(clearButton);
panelRight.add(southInPanelRight,BorderLayout.SOUTH);
JSplitPane split=new JSplitPane
(JSplitPane.HORIZONTAL_SPLIT,panelLeft,panelRight);
add(split,BorderLayout.CENTER);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setVisible(true);
setBounds(100,50,528,258);
validate();
}
public void actionPerformed(ActionEvent e){
if(e.getSource()==copyButton)
saveComputerProcess.copy();
if(e.getSource()==clearButton)
saveComputerProcess.setText(null);
if(e.getSource()==saveButton){
JFileChooser chooser=new JFileChooser();
int state=chooser.showSaveDialog(null);
File file=chooser.getSelectedFile();
if(file!=null&&state==JFileChooser.APPROVE_OPTION){
try{ String content=saveComputerProcess.getText();
StringReader read=new StringReader(content);
BufferedReader in= new BufferedReader(read);
FileWriter outOne=new FileWriter(file);
BufferedWriter out= new BufferedWriter(outOne);
String str=null;
while((str=in.readLine())!=null){
out.write(str);
out.newLine();
}
in.close();
out.close();
}
catch(IOException e1){}
}
}
}
public static void main(String args[]){
new CalculatorWindow();
}
}

Answer 2

计算器楼主去凡窝电脑技术论坛看看吧
那里的技术教程很多的
涉及很多方面的网络技术
有机会多去那看看教程吧