public static void main(String[] args) {
String st = "";
计算器 j = new 计算器();
boolean t = true;
while (t) {
Systemoutprint("请输入计算代码：");
BufferedReader br = new BufferedReader(new InputStreamReader(Systemin));
try {
st = brreadLine();
} catch (IOException ex) {
LoggergetLogger(计算器classgetName())log(LevelSEVERE, null, ex);
}
if (stequals("end")) {
t = false;
} else if (!stequals("")) {
j处理(st);
}
}
}
public void 处理(String st) {
if (stindexOf("+") != -1) {
加(符号处理(st, "+"));
} else if (stindexOf("-") != -1) {
减(符号处理(st, "-"));
} else if (stindexOf("") != -1) {
乘(符号处理(st, ""));
} else if (stindexOf("/") != -1) {
除(符号处理(st, "/"));
}
}
public int[] 符号处理(String st, String s) {
int[] i = new int[2];
i[0] = IntegerparseInt(stsubstring(0, stindexOf(s)));
i[1] = IntegerparseInt(stsubstring(stindexOf(s) + 1));
return i;
}
public void 加(int x[]) {
Systemoutprintln(x[0] + "+" + x[1] + "=" + (x[0] + x[1]));
}
public void 减(int[] x) {
Systemoutprintln(x[0] + "-" + x[1] + "=" + (x[0] - x[1]));
}
public void 乘(int[] x) {
Systemoutprintln(x[0] + "" + x[1] + "=" + x[0] x[1]);
}
public void 除(int x[]) {
if (x[1] == 0) {
Systemoutprint("除数不能为零");
return;
}
Systemoutprintln(x[0] + "/" + x[1] + "=" + x[0] / x[1]);
}
可以运行：输入示例：55+62
import javaawt;
import javaawtevent;
import javalang;
import javaxswing;
public class Counter extends Frame
{
//声明三个面板的布局
GridLayout gl1,gl2,gl3;
Panel p0,p1,p2,p3;
JTextField tf1;
TextField tf2;
Button b0,b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11,b12,b13,b14,b15,b16,b17,b18,b19,b20,b21,b22,b23,b24,b25,b26;
StringBuffer str;//显示屏所显示的字符串
double x,y;//x和y都是运算数
int z;//Z表示单击了那一个运算符0表示"+",1表示"-",2表示"",3表示"/"
static double m;//记忆的数字
public Counter()
{
gl1=new GridLayout(1,4,10,0);//实例化三个面板的布局
gl2=new GridLayout(4,1,0,15);
gl3=new GridLayout(4,5,10,15);
tf1=new JTextField(27);//显示屏
tf1setHorizontalAlignment(JTextFieldRIGHT);
tf1setEnabled(false);
tf1setText("0");
tf2=new TextField(10);//显示记忆的索引值
tf2setEditable(false);
//实例化所有按钮、设置其前景色并注册监听器
b0=new Button("Backspace");
b0setForeground(Colorred);
b0addActionListener(new Bt());
b1=new Button("CE");
b1setForeground(Colorred);
b1addActionListener(new Bt());
b2=new Button("C");
b2setForeground(Colorred);
b2addActionListener(new Bt());
b3=new Button("MC");
b3setForeground(Colorred);
b3addActionListener(new Bt());
b4=new Button("MR");
b4setForeground(Colorred);
b4addActionListener(new Bt());
b5=new Button("MS");
b5setForeground(Colorred);
b5addActionListener(new Bt());
b6=new Button("M+");
b6setForeground(Colorred);
b6addActionListener(new Bt());
b7=new Button("7");
b7setForeground(Colorblue);
b7addActionListener(new Bt());
b8=new Button("8");
b8setForeground(Colorblue);
b8addActionListener(new Bt());
b9=new Button("9");
b9setForeground(Colorblue);
b9addActionListener(new Bt());
b10=new Button("/");
b10setForeground(Colorred);
b10addActionListener(new Bt());
b11=new Button("sqrt");
b11setForeground(Colorblue);
b11addActionListener(new Bt());
b12=new Button("4");
b12setForeground(Colorblue);
b12addActionListener(new Bt());
b13=new Button("5");
b13setForeground(Colorblue);
b13addActionListener(new Bt());
b14=new Button("6");
b14setForeground(Colorblue);
b14addActionListener(new Bt());
b15=new Button("");
b15setForeground(Colorred);
b15addActionListener(new Bt());
b16=new Button("%");
b16setForeground(Colorblue);
b16addActionListener(new Bt());
b17=new Button("1");
b17setForeground(Colorblue);
b17addActionListener(new Bt());
b18=new Button("2");
b18setForeground(Colorblue);
b18addActionListener(new Bt());
b19=new Button("3");
b19setForeground(Colorblue);
b19addActionListener(new Bt());
b20=new Button("-");
b20setForeground(Colorred);
b20addActionListener(new Bt());
b21=new Button("1/X");
b21setForeground(Colorblue);
b21addActionListener(new Bt());
b22=new Button("0");
b22setForeground(Colorblue);
b22addActionListener(new Bt());
b23=new Button("+/-");
b23setForeground(Colorblue);
b23addActionListener(new Bt());
b24=new Button("");
b24setForeground(Colorblue);
b24addActionListener(new Bt());
b25=new Button("+");
b25setForeground(Colorred);
b25addActionListener(new Bt());
b26=new Button("=");
b26setForeground(Colorred);
b26addActionListener(new Bt());
//实例化四个面板
p0=new Panel();
p1=new Panel();
p2=new Panel();
p3=new Panel();
//创建一个空字符串缓冲区
str=new StringBuffer();
//添加面板p0中的组件和设置其在框架中的位置和大小
p0add(tf1);
p0setBounds(10,25,300,40);
//添加面板p1中的组件和设置其在框架中的位置和大小
p1setLayout(gl1);
p1add(tf2);
p1add(b0);
p1add(b1);
p1add(b2);
p1setBounds(10,65,300,25);
//添加面板p2中的组件并设置其的框架中的位置和大小
p2setLayout(gl2);
p2add(b3);
p2add(b4);
p2add(b5);
p2add(b6);
p2setBounds(10,110,40,150);
//添加面板p3中的组件并设置其在框架中的位置和大小
p3setLayout(gl3);//设置p3的布局
p3add(b7);
p3add(b8);
p3add(b9);
p3add(b10);
p3add(b11);
p3add(b12);
p3add(b13);
p3add(b14);
p3add(b15);
p3add(b16);
p3add(b17);
p3add(b18);
p3add(b19);
p3add(b20);
p3add(b21);
p3add(b22);
p3add(b23);
p3add(b24);
p3add(b25);
p3add(b26);
p3setBounds(60,110,250,150);
//设置框架中的布局为空布局并添加4个面板
setLayout(null);
add(p0);
add(p1);
add(p2);
add(p3);
setResizable(false);//禁止调整框架的大小
//匿名类关闭窗口
addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent e1)
{
Systemexit(0);
}
});
setBackground(ColorlightGray);
setBounds(100,100,320,280);
setVisible(true);
}
//构造监听器
class Bt implements ActionListener
{
public void actionPerformed(ActionEvent e2)
{
try{
if(e2getSource()==b1)//选择"CE"清零
{
tf1setText("0");//把显示屏清零
strsetLength(0);//清空字符串缓冲区以准备接收新的输入运算数
}
else if(e2getSource()==b2)//选择"C"清零
{
tf1setText("0");//把显示屏清零
strsetLength(0);
}
else if(e2getSource()==b23)//单击"+/-"选择输入的运算数是正数还是负数
{
x=DoubleparseDouble(tf1getText()trim());
tf1setText(""+(-x));
}
else if(e2getSource()==b25)//单击加号按钮获得x的值和z的值并清空y的值
{
x=DoubleparseDouble(tf1getText()trim());
strsetLength(0);//清空缓冲区以便接收新的另一个运算数
y=0d;
z=0;
}
else if(e2getSource()==b20)//单击减号按钮获得x的值和z的值并清空y的值
{
x=DoubleparseDouble(tf1getText()trim());
strsetLength(0);
y=0d;
z=1;
}
else if(e2getSource()==b15)//单击乘号按钮获得x的值和z的值并清空y的值
{
x=DoubleparseDouble(tf1getText()trim());
strsetLength(0);
y=0d;
z=2;
}
else if(e2getSource()==b10)//单击除号按钮获得x的值和z的值并空y的值
{
x=DoubleparseDouble(tf1getText()trim());
strsetLength(0);
y=0d;
z=3;
}
else if(e2getSource()==b26)//单击等号按钮输出计算结果
{
strsetLength(0);
switch(z)
{
case 0 : tf1setText(""+(x+y));break;
case 1 : tf1setText(""+(x-y));break;
case 2 : tf1setText(""+(xy));break;
case 3 : tf1setText(""+(x/y));break;
}
}
else if(e2getSource()==b24)//单击""按钮输入小数
{
if(tf1getText()trim()indexOf(′′)!=-1)//判断字符串中是否已经包含了小数点
{
}
else//如果没数点有小
{
if(tf1getText()trim()equals("0"))//如果初时显示为0
{
strsetLength(0);
tf1setText((strappend("0"+e2getActionCommand()))toString());
}
else if(tf1getText()trim()equals(""))//如果初时显示为空则不做任何 *** 作
{
}
else
{
tf1setText(strappend(e2getActionCommand())toString());
}
}
y=0d;
}
else if(e2getSource()==b11)//求平方根
{
x=DoubleparseDouble(tf1getText()trim());
tf1setText("数字格式异常");
if(x<0)
tf1setText("负数没有平方根");
else
tf1setText(""+Mathsqrt(x));
strsetLength(0);
y=0d;
}
else if(e2getSource()==b16)//单击了"%"按钮
{
x=DoubleparseDouble(tf1getText()trim());
tf1setText(""+(001x));
strsetLength(0);
y=0d;
}
else if(e2getSource()==b21)//单击了"1/X"按钮
{
x=DoubleparseDouble(tf1getText()trim());
if(x==0)
{
tf1setText("除数不能为零");
}
else
{
tf1setText(""+(1/x));
}
strsetLength(0);
y=0d;
}
else if(e2getSource()==b3)//MC为清除内存
{
m=0d;
tf2setText("");
strsetLength(0);
}
else if(e2getSource()==b4)//MR为重新调用存储的数据
{
if(tf2getText()trim()!="")//有记忆数字
{
tf1setText(""+m);
}
}
else if(e2getSource()==b5)//MS为存储显示的数据
{
m=DoubleparseDouble(tf1getText()trim());
tf2setText("M");
tf1setText("0");
strsetLength(0);
}
else if(e2getSource()==b6)//M+为将显示的数字与已经存储的数据相加要查看新的数字单击MR
{
m=m+DoubleparseDouble(tf1getText()trim());
}
else//选择的是其他的按钮
{
if(e2getSource()==b22)//如果选择的是"0"这个数字键
{
if(tf1getText()trim()equals("0"))//如果显示屏显示的为零不做 *** 作
{
}
else
{
tf1setText(strappend(e2getActionCommand())toString());
y=DoubleparseDouble(tf1getText()trim());
}
}
else if(e2getSource()==b0)//选择的是“BackSpace”按钮
{
if(!tf1getText()trim()equals("0"))//如果显示屏显示的不是零
{
if(strlength()!=1)
{
tf1setText(strdelete(strlength()-1,strlength())toString());//可能抛出字符串越界异常
}
else
{
tf1setText("0");
strsetLength(0);
}
}
y=DoubleparseDouble(tf1getText()trim());
}
else//其他的数字键
{
tf1setText(strappend(e2getActionCommand())toString());
y=DoubleparseDouble(tf1getText()trim());
}
}
}
catch(NumberFormatException e){
tf1setText("数字格式异常");
}
catch(StringIndexOutOfBoundsException e){
tf1setText("字符串索引越界");
}
}
}
public static void main(String args[])
{
new Counter();
}
}
给你一个参考，希望不要被百度吞了当晚餐
import javaawtBorderLayout;
import javaawtGridLayout;
import javaawteventMouseEvent;
import javaawteventMouseListener;
import javatextDecimalFormat;
import javaxswingJButton;
import javaxswingJFrame;
import javaxswingJPanel;
import javaxswingJTextField;
public class Calculator {
//计算器面板
private JFrame f = new JFrame("Calculator");
//输入面扳
private JPanel inputPanel = new JPanel();
//加减乘除面板
private JPanel operationPanel = new JPanel();
//数字面板
private JPanel buttonsPanel = new JPanel();
//输入数据文本框
private JTextField input = new JTextField(20);
//退格键
private JButton backspace = new JButton("BackSpace");
//清空
private JButton CE = new JButton("CE ");
//删除
private JButton C = new JButton("C ");
//四则运算符号键
private JButton add = new JButton("+");
private JButton sub = new JButton("-");
private JButton mul = new JButton("");
private JButton div = new JButton("/");
//小数点
private JButton decimal = new JButton("");
//等号
private JButton equal = new JButton("=");
//数字键
private JButton zero = new JButton("0");
private JButton one = new JButton("1");
private JButton two = new JButton("2");
private JButton three = new JButton("3");
private JButton four = new JButton("4");
private JButton five = new JButton("5");
private JButton six = new JButton("6");
private JButton seven = new JButton("7");
private JButton eight = new JButton("8");
private JButton nine = new JButton("9");
private String num1 = "";//保存第一个运算数字
private String operator = "";//保存运算符号
public static void main(String[] args) {
new Calculator();//new计算器实例
}
public Calculator(){
//添加组件，布局
inputPaneladd(input);
fadd(inputPanel, BorderLayoutNORTH);
operationPaneladd(backspace);
operationPaneladd(CE);
operationPaneladd(C);
fadd(operationPanel, BorderLayoutCENTER);
buttonsPaneladd(add);
buttonsPaneladd(sub);
buttonsPaneladd(mul);
buttonsPaneladd(div);
buttonsPaneladd(one);
buttonsPaneladd(two);
buttonsPaneladd(three);
buttonsPaneladd(zero);
buttonsPaneladd(four);
buttonsPaneladd(five);
buttonsPaneladd(six);
buttonsPaneladd(decimal);
buttonsPaneladd(seven);
buttonsPaneladd(eight);
buttonsPaneladd(nine);
buttonsPaneladd(equal);
buttonsPanelsetLayout(new GridLayout(4, 4));
fadd(buttonsPanel, BorderLayoutSOUTH);
//注册各个组件监听事件
backspaceaddMouseListener(new OperationMouseListener());
CEaddMouseListener(new OperationMouseListener());
CaddMouseListener(new OperationMouseListener());
decimaladdMouseListener(new OperationMouseListener());
equaladdMouseListener(new OperationMouseListener());
//注册四则运算监听
addaddMouseListener(new CalcMouseListener());
subaddMouseListener(new CalcMouseListener());
muladdMouseListener(new CalcMouseListener());
divaddMouseListener(new CalcMouseListener());
//注册数字监听事件
zeroaddMouseListener(new NumberMouseListener());
oneaddMouseListener(new NumberMouseListener());
twoaddMouseListener(new NumberMouseListener());
threeaddMouseListener(new NumberMouseListener());
fouraddMouseListener(new NumberMouseListener());
fiveaddMouseListener(new NumberMouseListener());
sixaddMouseListener(new NumberMouseListener());
sevenaddMouseListener(new NumberMouseListener());
eightaddMouseListener(new NumberMouseListener());
nineaddMouseListener(new NumberMouseListener());
fsetVisible(true);
fpack();
fsetDefaultCloseOperation(JFrameEXIT_ON_CLOSE);
}
private class NumberMouseListener implements MouseListener{
public void mouseClicked(MouseEvent e) {
if(inputgetText()trim()equals("0")){//如果文本框已经是0，结果还是0
inputsetText(((JButton)egetSource())getText()trim());
}else{//否则的话，把0添加到后面，譬如文本框是1，结果就为10
inputsetText(inputgetText()concat(((JButton)egetSource())getText()trim()));
}
}
public void mouseEntered(MouseEvent e) {}
public void mouseExited(MouseEvent e) {}
public void mousePressed(MouseEvent e) {}
public void mouseReleased(MouseEvent e) {}
}
private class CalcMouseListener implements MouseListener{
//如果输入的是运算符号，保存第一个结果和运算符号
public void mouseClicked(MouseEvent e) {
num1 = inputgetText()trim();inputsetText("");
operator = ((JButton)egetSource())getText()trim();
}
public void mouseEntered(MouseEvent e) {}
public void mouseExited(MouseEvent e) {}
public void mousePressed(MouseEvent e) {}
public void mouseReleased(MouseEvent e) {}
}
private class OperationMouseListener implements MouseListener{
public void mouseClicked(MouseEvent e) {
if(egetSource() == backspace){//退格键，删除一个直到没有字符删除
String inputText = inputgetText();
if(inputTextlength() > 0){
inputsetText(inputTextsubstring(0, inputTextlength() - 1));
}
}else if(egetSource() == C){
inputsetText("0");//C，清空所有运算数字和符号
num1 = "";
}else if(egetSource() == CE){
inputsetText("0");//CE-->将文本框置为0
}else if(egetSource() == decimal){
String text = inputgetText()trim();
//如果按了小数点，如果文本框已经有小数点，不做任何 *** 作，否则在结果后面加上小数点
if(textindexOf("") == -1){
inputsetText(textconcat(""));
}
}else if(egetSource() == equal){
//如果是等号
if(!operatortrim()equals("")){
if(!inputgetText()trim()equals("")){
double result = 0D;
if(operatorequals("+")){//执行加法运算
result = DoubleparseDouble(num1) + DoubleparseDouble(inputgetText()trim());
}else if(operatorequals("-")){//减法运算
result = DoubleparseDouble(num1) - DoubleparseDouble(inputgetText()trim());
}else if(operatorequals("")){//乘法运算
result = DoubleparseDouble(num1) DoubleparseDouble(inputgetText()trim());
}else if(operatorequals("/")){//除法运算
result = DoubleparseDouble(num1) / DoubleparseDouble(inputgetText()trim());
}
//格式化最终结果，保留两位小数点
inputsetText(new DecimalFormat("000")format(result));
}
}
}
}
public void mouseEntered(MouseEvent e) {}
public void mouseExited(MouseEvent e) {}
public void mousePressed(MouseEvent e) {}
public void mouseReleased(MouseEvent e) {}
}
}
import javaawt;
import javaapplet;
public class CalculatorDemo extends Applet
{
TextField answerText;
Button pointButton,equalButton,plusButton;
Button minusButton,clearButton,multiButton,divisionButton;
Button[] b=new Button[10];
String currentOp,preOp;
String foreText,backText;
boolean isFloat=false;
public void init()
{
Panel p1=new Panel();
Panel p2=new Panel();
Panel p3=new Panel();
currentOp=new String("");
preOp=new String("");
foreText=new String("");
backText=new String("");
answerText=new TextField(8);
setBackground(ColorlightGray);
setForeground(Colorblue);
for(int i=9;i>=0;i--)
{
b[i]=new Button(IntegertoString(i));
p2add(b[i]);
}
pointButton=new Button("");
equalButton=new Button("=");
equalButtonsetForeground(Colorred);
clearButton=new Button("清除");
clearButtonsetForeground(Colorred);
divisionButton=new Button("/");
divisionButtonsetForeground(Colorred);
multiButton=new Button("");
multiButtonsetForeground(Colorred);
minusButton=new Button("-");
minusButtonsetForeground(Colorred);
plusButton=new Button("+");
plusButtonsetForeground(Colorred);
setLayout(new FlowLayout());
p1setLayout(new FlowLayout());
p2setLayout(new GridLayout(4,3));
p3setLayout(new GridLayout(4,1));
p1add(answerText);
p1add(clearButton);
p2add(pointButton);
p2add(equalButton);
p3add(plusButton);
p3add(minusButton);
p3add(multiButton);
p3add(divisionButton);
add(p1);
add(p2);
add(p3);
}
public boolean action(Event e,Object o)
{
String s=new String("");
for(int i=0;i<10;i++)
{
if(etarget==b[i]||etarget==pointButton)
{
if(etarget !=pointButton)
{
s=(String)o;
doForeText(s);
}
if((etarget==pointButton)&&(!isFloat))
{
isFloat=true;
s=(String)o;
if(foreTextequals(""))
{
foreText +="0";
}
else
{
doForeText(s);
}
}
}
}
if(etarget==clearButton)
{
doClear();
}
if((etarget==clearButton)||(etarget==divisionButton)
||(etarget==plusButton)||(etarget==minusButton))
{
if(foreText !="")
{
currentOp=((String)o);
doOperator();
}
else
{
preOp=((String)o);
}
}
if(etarget==equalButton)
{
doOperator();
}
return true;
}
public void doOperator()
{
double dFore,dBack;
Double d;
if(preOpequals(""))
{
backText=foreText;
foreText="";
answerTextsetText(backText);
}
else
{
dFore=(new Double(foreText))doubleValue();
dBack=(new Double(backText))doubleValue();
foreText="";
backText=answerTextgetText();
if(preOpequals("+"))
{
d=new Double((dBack+dFore));
answerTextsetText(dtoString());
backText=dtoString();
}
if(preOpequals("-"))
{
d=new Double((dBack-dFore));
answerTextsetText(dtoString());
backText=dtoString();
}
if(preOpequals(""))
{
d=new Double((dBackdFore));
answerTextsetText(dtoString());
backText=dtoString();
}
if(preOpequals("/"))
{
if(dFore==0)
{
answerTextsetText("除数不能为0");
return;
}
d=new Double((dBack/dFore));
answerTextsetText(dtoString());
backText=dtoString();
}
}
preOp=currentOp;
}
public void doForeText(String s)
{
foreText +=s;
answerTextsetText(foreText);
}
public void doBackText(String s)
{
backText=foreText;
foreText="";
answerTextsetText(foreText);
}
public void doClear()
{
currentOp="";
preOp="";
foreText="";
backText="";
isFloat=false;
answerTextsetText("");
}
}
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