mycalculator.java.txt

简单的计算器程序~ 用JAVA写的~~ 如果 感到有用的话 就看看把

import java.awt.*; 
import java.awt.event.*; 
import javax.swing.*;

public class MyCalculator implements ActionListener 
{ 
JFrame f; 
JMenu mEdit; 
JMenu mView; 
JMenu mHelp; 
JMenuItem mCopy; 
JMenuItem mPaste; 
JTextField tResult;

JButton bNumber; 
JButton bOperator; 
JButton bOther; 
JButton bM;

boolean isDouble=false;//是否为实数 
int opFlag=-1; 
static double t1=0,t2=0,t3=0,result=0; 
static int opflag1=-1,opflag2=-1,flag=0,resflag=1; 
int preOp,currentOp=0;//标准位 
double op1=0,op2=0;//操作数 
double n3; 
StringBuffer buf=new StringBuffer(20); 
StringBuffer copyBoard=new StringBuffer(20);//剪贴板 
StringBuffer memory = new StringBuffer(20);//M系列 
StringBuffer str = new StringBuffer(); 
public MyCalculator() 
{ 
f = new JFrame("计算器ByMdou"); 
Container contentPane = f.getContentPane(); 
/****************菜单的创建开始**************************************/ 
JMenuBar mBar = new JMenuBar(); 
mBar.setOpaque(true);

mEdit = new JMenu("编辑(E)"); 
mEdit.setMnemonic(KeyEvent.VK_E); 
mCopy = new JMenuItem("复制(C)"); 
mEdit.add(mCopy); 
mPaste = new JMenuItem("粘贴(P)"); 
mEdit.add(mPaste);

mView = new JMenu("查看(V)"); 
mView.setMnemonic(KeyEvent.VK_V); 
mView.add(new JMenuItem("标准型")); 
mView.add(new JMenuItem("科学型")); 
mView.addSeparator(); 
mView.add(new JMenuItem("查看分组"));

mHelp = new JMenu("帮助(H)"); 
mHelp.setMnemonic(KeyEvent.VK_H); 
mHelp.add(new JMenuItem("帮助主题")); 
mHelp.addSeparator(); 
mHelp.add(new JMenuItem("关于计算器"));

mBar.add(mEdit); 
mBar.add(mView); 
mBar.add(mHelp); 
f.setJMenuBar(mBar); 
contentPane.setLayout(new BorderLayout()); 
JPanel pTop = new JPanel(); 
tResult = new JTextField("0.",26); 
tResult.setHorizontalAlignment(JTextField.RIGHT ); 
tResult.setEditable(false); 
pTop.add(tResult); 
contentPane.add(pTop,BorderLayout.NORTH); 
JPanel pBottom = new JPanel(); 
pBottom.setLayout(new BorderLayout()); 
JPanel pLeft = new JPanel(); 
pLeft.setLayout(new GridLayout(5,1,3,3)); 
bM = new JButton(" ");

bM.setEnabled(false); 
pLeft.add(bM); 
bOther = new JButton("MC"); 
bOther.addActionListener(this); 
bOther.setForeground(Color.RED); 
bOther.setMargin(new Insets(3,2,3,2)); 
pLeft.add(bOther); 
bOther = new JButton("MR"); 
bOther.addActionListener(this); 
bOther.setForeground(Color.RED); 
bOther.setMargin(new Insets(3,2,3,2)); 
pLeft.add(bOther); 
bOther = new JButton("MS"); 
bOther.addActionListener(this); 
bOther.setForeground(Color.RED); 
bOther.setMargin(new Insets(3,2,3,2)); 
pLeft.add(bOther); 
bOther = new JButton("M+"); 
bOther.addActionListener(this); 
bOther.setForeground(Color.RED); 
bOther.setMargin(new Insets(3,2,3,2)); 
pLeft.add(bOther); 
pBottom.add(pLeft,BorderLayout.WEST); 
JPanel pRight = new JPanel(); 
pRight.setLayout(new BorderLayout()); 
JPanel pUp = new JPanel(); 
pUp.setLayout(new GridLayout(1,3,3,0)); 
bOther = new JButton("Backspace"); 
bOther.addActionListener(this); 
bOther.setForeground(Color.RED); 
bOther.setMargin(new Insets(3,0,3,5)); 
pUp.add(bOther); 
bOther = new JButton("CE"); 
bOther.addActionListener(this); 
bOther.setForeground(Color.RED); 
pUp.add(bOther); 
bOther = new JButton("C"); 
bOther.addActionListener(this); 
bOther.setForeground(Color.RED); 
pUp.add(bOther); 
JPanel pDown = new JPanel(); 
pDown.setLayout(new GridLayout(4,5,3,2)); 
bNumber = new JButton("7"); 
bNumber.setForeground(Color.blue); 
bNumber.addActionListener(this); 
bNumber.setMargin(new Insets(3,3,3,3)); 
pDown.add(bNumber); 
bNumber = new JButton("8"); 
bNumber.setForeground(Color.blue); 
bNumber.addActionListener(this); 
bNumber.setMargin(new Insets(3,3,3,3)); 
pDown.add(bNumber); 
bNumber = new JButton("9"); 
bNumber.setForeground(Color.blue); 
bNumber.addActionListener(this); 
bNumber.setMargin(new Insets(3,3,3,3)); 
pDown.add(bNumber); 
bOperator = new JButton("/"); 
bOperator.setForeground(Color.RED); 
bOperator.addActionListener(this);

bOperator.setMargin(new Insets(3,0,3,0)); 
pDown.add(bOperator); 
bOperator = new JButton("sqrt"); 
bOperator.addActionListener(this); 
bOperator.setForeground(Color.blue); 
bOperator.setMargin(new Insets(3,0,3,0)); 
pDown.add(bOperator); 
bNumber = new JButton("4"); 
bNumber.setForeground(Color.blue); 
bNumber.addActionListener(this); 
bNumber.setMargin(new Insets(3,3,3,3)); 
bNumber.setHorizontalTextPosition(JButton.LEFT); 
pDown.add(bNumber); 
bNumber = new JButton("5"); 
bNumber.setForeground(Color.blue); 
bNumber.addActionListener(this); 
bNumber.setMargin(new Insets(3,3,3,3)); 
pDown.add(bNumber); 
bNumber = new JButton("6"); 
bNumber.setForeground(Color.blue); 
bNumber.addActionListener(this); 
bNumber.setMargin(new Insets(3,3,3,3)); 
pDown.add(bNumber); 
bOperator = new JButton("*"); 
bOperator.setForeground(Color.RED); 
bOperator.addActionListener(this); 
bOperator.setMargin(new Insets(3,3,3,3)); 
pDown.add(bOperator); 
bOperator = new JButton("%"); 
bOperator.setForeground(Color.blue); 
bOperator.addActionListener(this); 
bOperator.setMargin(new Insets(3,3,3,3)); 
pDown.add(bOperator); 
bNumber = new JButton("1"); 
bNumber.setForeground(Color.blue); 
bNumber.addActionListener(this); 
bNumber.setMargin(new Insets(3,3,3,3)); 
pDown.add(bNumber); 
bNumber = new JButton("2"); 
bNumber.setForeground(Color.blue); 
bNumber.addActionListener(this); 
bNumber.setMargin(new Insets(3,3,3,3)); 
pDown.add(bNumber); 
bNumber = new JButton("3"); 
bNumber.setForeground(Color.blue); 
bNumber.addActionListener(this); 
bNumber.setMargin(new Insets(3,3,3,3)); 
pDown.add(bNumber); 
bOperator = new JButton("-"); 
bOperator.setForeground(Color.RED); 
bOperator.addActionListener(this); 
bOperator.setMargin(new Insets(3,3,3,3)); 
pDown.add(bOperator); 
bOperator = new JButton("1/x"); 
bOperator.setForeground(Color.blue); 
bOperator.addActionListener(this); 
pDown.add(bOperator); 
bNumber = new JButton("0"); 
bNumber.setForeground(Color.blue); 
bNumber.addActionListener(this); 
bNumber.setMargin(new Insets(3,3,3,3)); 
pDown.add(bNumber); 
bOperator = new JButton("+/-"); 
bOperator.setForeground(Color.blue); 
bOperator.addActionListener(this); 
bOperator.setMargin(new Insets(3,3,3,3)); 
pDown.add(bOperator); 
bOperator = new JButton("."); 
bOperator.setForeground(Color.blue); 
bOperator.addActionListener(this); 
bOperator.setMargin(new Insets(3,3,3,3)); 
pDown.add(bOperator); 
bOperator = new JButton("+"); 
bOperator.setForeground(Color.RED); 
bOperator.addActionListener(this); 
bOperator.setMargin(new Insets(3,3,3,3)); 
pDown.add(bOperator); 
bOperator = new JButton("="); 
bOperator.setForeground(Color.blue); 
bOperator.addActionListener(this); 
bOperator.setMargin(new Insets(3,3,3,3)); 
pDown.add(bOperator); 
pRight.add(pUp,BorderLayout.NORTH); 
pRight.add(pDown,BorderLayout.SOUTH); 
pBottom.add(pRight,BorderLayout.EAST); 
contentPane.add(pBottom,BorderLayout.SOUTH);
f.setSize(new Dimension(320,256));

f.setResizable(false); 
f.setVisible(true); 
f.addWindowListener(new WindowAdapter() 
{ 
public void windowClosing(WindowEvent e) 
{ 
System.exit(0); 
} 
} 
); 
} 
public void actionPerformed(ActionEvent e) 
{ 
String s=e.getActionCommand(); 
if(s.equals("复制(C)")) 
{ 
String temp=tResult.getText().trim(); 
copyBoard.replace(0,copyBoard.length(),temp); 
mPaste.setEnabled(true); 
} 
else if(s.equals("粘贴(P)")) 
{ 
tResult.setText(copyBoard.toString()); 
} 
else if(s.equals("CE")) 
{//如果是CE则清除文本框 
tResult.setText("0."); 
} 
else if(s.equals("Backspace")) 
{//如果是backspace则删除一个字符。 
if(!tResult.getText().trim().equals("0.")) 
{ //如果文本框中有内容 
if(str.length()!=1&&str.length()!=0) 
{ 
tResult.setText(str.delete(str.length()-1,str.length()).toString()); 
} 
else 
{ 
tResult.setText("0."); 
str.setLength(0); 
} 
} 
op2=Double.parseDouble(tResult.getText().trim()); 
} 
else if(s.equals("C")) 
{//如果是C删除当前计算。 
tResult.setText("0."); 
op1=op2=0; 
str.replace(0,str.length()," "); 
preOp=currentOp=0; 
} 
else if(s.equals("MC")) 
{ //如果是MC则清除缓冲区 
String temp=""; 
memory.replace(0,memory.length(),temp); 
bM.setText(" "); 
} 
else if(s.equals("MR")) 
{ //如果按键为MR则恢复缓冲区的数到文本框 
tResult.setText(memory.toString()); 
} 
else if(s.equals("MS")) 
{//如果按键为MS则将文本框的数存入缓冲区 
String s1=tResult.getText().trim(); 
memory.replace(0,memory.length(),s1); 
bM.setText("M"); 
} 
else if(s.equals("M+")) 
{ //如果按键为MS则将文本框值与缓冲区的数相加但不显示结果。 
String temp1=tResult.getText().trim(); 
double dtemp=Double.parseDouble(temp1); 
String temp2=memory.toString(); 
dtemp+=Double.parseDouble(temp2); 
temp1=String.valueOf(dtemp); 
memory.replace(0,memory.length(),temp1); 
} 
else if(s.equals("1/x")) 
{//如果按键为1/x则将文本框中的数据置为它的倒数。 
String temp=tResult.getText().trim(); 
double dtemp=Double.parseDouble(temp); 
tResult.setText(""+1/dtemp); 
} 
else if(s.equals("sqrt")) 
{ //如果按键为sqrt则将文本框中的内容求平方根 
String temp=tResult.getText().trim(); 
double dtemp=Double.parseDouble(temp); 
tResult.setText(""+Math.sqrt(dtemp)); 
} 
else if(s.equals("+"))//+ 
{ 
str.setLength(0); 
if(currentOp==0) 
{ 
preOp=currentOp=1;//op1=0; 
op2=0; 
tResult.setText(""+op1); 
} 
else 
{ 
currentOp =preOp; 
preOp =1; 
switch(currentOp){ 
case 1:op1=op1+op2;tResult.setText(""+op1);break; 
case 2:op1=op1-op2;tResult.setText(""+op1);break; 
case 3:op1=op1*op2;tResult.setText(""+op1);break; 
case 4:op1=op1/op2;tResult.setText(""+op1);break; 
} 
} 
} 
else if(s.equals("-"))//- 
{ 
str.setLength(0); 
if(currentOp==0) 
{ 
preOp=currentOp=2;//op1=op2;op2=0; 
tResult.setText(""+op1); 
} 
else 
{ 
currentOp =preOp; 
preOp =2; 
switch(currentOp){ 
case 1:op1=op1+op2;tResult.setText(""+op1);break; 
case 2:op1=op1-op2;tResult.setText(""+op1);break; 
case 3:op1=op1*op2;tResult.setText(""+op1);break; 
case 4:op1=op1/op2;tResult.setText(""+op1);break; 
} 
} 
} 
else if(s.equals("*"))//* 
{ 
str.setLength(0); 
if(currentOp==0) 
{ 
preOp=currentOp=3;//op1=op2;op2=1; 
tResult.setText(""+op1);//op1=op2; 
} 
else 
{ 
currentOp =preOp; 
preOp =3; 
switch(currentOp){ 
case 1:op1=op1+op2;tResult.setText(""+op1);break; 
case 2:op1=op1-op2;tResult.setText(""+op1);break; 
case 3:op1=op1*op2;tResult.setText(""+op1);break; 
case 4:op1=op1/op2;tResult.setText(""+op1);break; 
} 
} 
} 
else if(s.equals("/"))// / 
{ 
str.setLength(0); 
if(currentOp==0) 
{ 
preOp=currentOp=4;//op2=1; 
tResult.setText(""+op1);//op1=op2; 
} 
else 
{ 
currentOp =preOp; 
preOp =4; 
switch(currentOp){ 
case 1:op1=op1+op2;tResult.setText(""+op1);break; 
case 2:op1=op1-op2;tResult.setText(""+op1);break; 
case 3:op1=op1*op2;tResult.setText(""+op1);break; 
case 4:op1=op1/op2;tResult.setText(""+op1);break; 
} 
} 
} 
else if(s.equals("="))// = 
{ 
if(currentOp==0) 
{ 
str.setLength(0); 
tResult.setText(""+op2); 
} 
else 
{ 
str.setLength(0); 
currentOp =preOp; 
switch(currentOp){ 
case 1:op1=op1+op2;tResult.setText(""+op1);break; 
case 2:op1=op1-op2;tResult.setText(""+op1);break; 
case 3:op1=op1*op2;tResult.setText(""+op1);break; 
case 4:op1=op1/op2;tResult.setText(""+op1);break; 
} 
currentOp=0; 
op2=0; 
} 
} 
else if(s.equals(".")) 
{ 
isDouble=true; 
if(tResult.getText().trim().indexOf('.')!=-1); 
else 
{ 
if(tResult.getText().trim().equals("0")) 
{ 
str.setLength(0); 
tResult.setText((str.append("0"+s)).toString()); 
} 
//else if(tResult.getText().trim().equals("")){}//如果初时显示为空则不做任何操作 
else 
{ 
tResult.setText((str.append(s)).toString()); 
} 
} 
} 
else if(s.equals("0"))//如果选择的是"0"这个数字键 
{ 
if(tResult.getText().trim().equals("0.")){} 
else 
{ 
tResult.setText(str.append(s).toString()); 
op2=Double.parseDouble(tResult.getText().trim()); 
} 
} 
else 
{ 
tResult.setText(str.append(s).toString()); 
op2=Double.parseDouble(tResult.getText().trim()); 
if(currentOp==0) 
op1=op2; 
}


}//end actionPerformed


public static void main(String[] args) 
{ 
new MyCalculator(); 
}

}