求簡單JAVA程序代碼，能操作的，簡單的計算器有計算功能+-*/就行越簡單越好！！！急！！！

public static void main(String[] args) {

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String st = "";

計算器 j = new 計算器();

boolean t = true;

while (t) {

System.out.print("請輸入計算代碼：");

BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

try {

st = br.readLine();

} catch (IOException ex) {

Logger.getLogger(計算器.class.getName()).log(Level.SEVERE, null, ex);

}

if (st.equals("end")) {

t = false;

} else if (!st.equals("")) {

j.處理(st);

}

}

}

public void 處理(String st) {

if (st.indexOf("+") != -1) {

加(符號處理(st, "+"));

} else if (st.indexOf("-") != -1) {

減(符號處理(st, "-"));

} else if (st.indexOf("握棚*") != -1) {

乘(符號處理(st, "*"叢野));

} else if (st.indexOf("/") != -1) {

除(符號處理(st, "/"));

}

}

public int[] 符號處理(String st, String s) {

int[] i = new int[2];

i[0] = Integer.parseInt(st.substring(0, st.indexOf(s)));

i[1] = Integer.parseInt(st.substring(st.indexOf(s) + 1));

return i;

}

public void 加(int x[]) {

System.out.println(x[0] + "+" + x[1] + "=" + (x[0] + x[1]));

}

public void 減(int[] x) {

System.out.println(x[0] + "-" + x[1] + "=" + (x[0] - x[1]));

}

public void 乘(int[] x) {

System.out.println(x[0] + "*" + x[1] + "=" + x[0] * x[1]);

}

public void 除(int x[]) {

if (x[1] == 0) {

System.out.print("除數不能為零"段鄭則);

return;

}

System.out.println(x[0] + "/" + x[1] + "=" + x[0] / x[1]);

}

可以運行：輸入示例：55+62

求java計算器的代碼

import java.awt.*;

import java.awt.event.*;

import java.util.*;

import javax.swing.*;

public class Calculator extends JFrame{

private float op1,op2;//定義兩個變量存放需要運算的值

private String str="";//定義str去和text進行交叉賦值

private String opr,co;//opr存放符合，co用來存放復制的內容

private double re;//用來存放運算的結果

private boolean bo=false;//是否進行了+-*/運算

private boolean btime=false;//時間開關

Container contentpane=this.getContentPane();

JPanel panel1=new JPanel(new BorderLayout()),

panel2=new JPanel(new FlowLayout()),

panel3=new JPanel(new GridLayout(4,5)),

panel4=new JPanel(new BorderLayout()),

panel5=new JPanel(new BorderLayout());

//菜單欄

JMenuBar menubar=new JMenuBar();

JMenu edit=new JMenu("編輯(E)"),

find=new JMenu("查看(V)"),

help=new JMenu("幫助(H)");

JMenuItem copy=new JMenuItem("復制(C)",'C'),

paste=new JMenuItem("粘貼(P)",'P'),

standard=new JMenuItem("標準型(T)",'T'),

science=new JMenuItem("科學型(S)",'S'),

numarray=new JMenuItem("數字分組(I)",'I'),

helptopic=new JMenuItem("幫助主納裂中洞山題(H)",'H'),

aboutcal=new JMenuItem("關于計算器源扒(A)",'A');

//輸入文本框

JTextField text=new JTextField(25);

//數字鍵

JButton one=new JButton("1"),

two=new JButton("2"),

three=new JButton("3"),

four=new JButton("4"),

five=new JButton("5"),

six=new JButton("6"),

seven=new JButton("7"),

eight=new JButton("8"),

nine=new JButton("9"),

zero=new JButton("0");

//功能鍵

JButton division=new JButton("/"),

multiply=new JButton("*"),

addition=new JButton("+"),

subtration=new JButton("-"),

sqrt=new JButton("sqrt"),

residual=new JButton("%"),

sign=new JButton("+/-"),

dot=new JButton("."),

reciprocal=new JButton("1/X"),

amount=new JButton("="),

backspace=new JButton("Backspace"),

ce=new JButton("CE"),

c=new JButton("C"),

time=new JButton("time");

public Calculator() {

contentpane.setLayout(new BorderLayout());

//textField文本從右邊開始寫

text.setHorizontalAlignment(SwingConstants.RIGHT);

text.setText("0.");

//菜單欄添加

edit.add(copy);

edit.add(paste);

find.add(standard);

find.add(science);

find.addSeparator();

find.add(numarray);

help.add(helptopic);

help.addSeparator();

help.add(aboutcal);

//把組件添加至容器中

menubar.add(edit);

menubar.add(find);

menubar.add(help);

panel1.add(menubar,"North");

panel1.add(text,"West");

//添加數字、功能鍵至panel2、panel3

panel2.add(backspace);

panel2.add(ce);

panel2.add(c);

panel2.add(time);

panel3.add(seven);

panel3.add(eight);

panel3.add(nine);

panel3.add(division);

panel3.add(sqrt);

panel3.add(four);

panel3.add(five);

panel3.add(six);

panel3.add(multiply);

panel3.add(residual);

panel3.add(one);

panel3.add(two);

panel3.add(three);

panel3.add(subtration);

panel3.add(reciprocal);

panel3.add(zero);

panel3.add(sign);

panel3.add(dot);

panel3.add(addition);

panel3.add(amount);

panel4.add(panel2,"North");

panel4.add(panel3,"West");

panel5.add(panel1,"North");

panel5.add(panel4,"West");

contentpane.add(panel5,"North");

//事件

//助記符

edit.setMnemonic('E');

find.setMnemonic('V');

help.setMnemonic('H');

//快捷鍵

KeyStroke kcopy=KeyStroke.getKeyStroke(KeyEvent.VK_C,Event.CTRL_MASK);

copy.setAccelerator(kcopy);

KeyStroke kpaste=KeyStroke.getKeyStroke(KeyEvent.VK_V,Event.CTRL_MASK);

paste.setAccelerator(kpaste);

//0-9、.的顯示事件

actionlistener1 al1=new actionlistener1();

one.addActionListener(al1);

two.addActionListener(al1);

three.addActionListener(al1);

four.addActionListener(al1);

five.addActionListener(al1);

six.addActionListener(al1);

seven.addActionListener(al1);

eight.addActionListener(al1);

nine.addActionListener(al1);

//小數點的ActionListener事件

dot.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e){

int count;

count=str.length();

//1.第一位就為.時改變text中內容為："0."

if(count==0){

str="0.";

text.setText(str);

}

//2.不可以重復按"."

else {if(!str.contains(".")){

str+=".";

text.setText(str);

}

else

System.out.println("您再點的話，輸入的將不再是小數了！");

}

}

});

//如果第一位是0那么第二位就不可以為0

zero.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e){

int count;

count=str.length();

if(bo){

if(!(str.contains("0")count==1)){

str="";

str+="0";

text.setText(str);

}else

System.out.println("您再點的話，輸入的將不再是數字了！");

}

else{

if(!(str.contains("0")count==1)){

str+="0";

text.setText(str);

}else

System.out.println("您再點的話，輸入的將不再是數字了！");

}

bo=false;

}

});

//+、-、*、/、%運算

actionlistener3 al3=new actionlistener3();

addition.addActionListener(al3);

subtration.addActionListener(al3);

multiply.addActionListener(al3);

division.addActionListener(al3);

residual.addActionListener(al3);

//CE和C清空按鈕時間

actionlistener2 al2=new actionlistener2();

ce.addActionListener(al2);

c.addActionListener(al2);

//退格鍵

backspace.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e){

int count;

count=str.length()-1;

if(bo==false){

if(count=0){

str=str.substring(0,count);

text.setText(str);

}

else

text.setText("0.");

}else

System.out.println("您現在正進行法則運算！");

}

});

//求平方根

sqrt.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e){

int count;

count=str.length();

if(count!=0){

op1=Float.parseFloat(text.getText());

re=Math.sqrt(op1);

String str1=String.valueOf(re);

text.setText(str1);

str="";

}

else

System.out.println("您現在的按sqrt鍵毫無意義");

}

});

//求倒數

reciprocal.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e){

int count;

count=str.length();

if(count!=0){

op1=Float.parseFloat(text.getText());

if(op1!=0){

re=1/op1;

String str1=String.valueOf(re);

text.setText(str1);

str=str1;

}

else{

text.setText("除數不可以為0的");

str="";

}

}

else

System.out.println("您現在的按1/X鍵毫無意義");

}

});

//=事件

amount.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e){

op2=Float.parseFloat(str);

//需判斷進行那種運算法則

if(opr=="+"){//加法運算

re=op1+op2;

String str1=String.valueOf(re);

text.setText(str1);

str=String.valueOf(re);

}else{

if(opr=="-"){//減法運算

re=op1-op2;

String str1=String.valueOf(re);

text.setText(str1);

str=String.valueOf(re);

}else{

if(opr=="*"){//乘法運算

re=op1*op2;

String str1=String.valueOf(re);

text.setText(str1);

str=String.valueOf(re);

}else{

if(opr=="/"op2!=0){//除法運算

re=op1/op2;

String str1=String.valueOf(re);

text.setText(str1);

str=String.valueOf(re);

}else{

if(opr=="%"){//取余運算

re=op1%op2;

String str1=String.valueOf(re);

text.setText(str1);

str="";

}

else if(op2==0){

text.setText("除數不可以為0的");

str="";

}

}

}

}

}

//打印看看

System.out.print(op1);

System.out.print(opr);

System.out.print(op2+"=");

System.out.print(re);

System.out.println();

}

});

//復制事件

copy.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e){

int count;

count=str.length();

if(count!=0){

co=text.getText();

}

else

System.out.println("沒有可復制的對象");

}

});

//粘貼事件

paste.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e){

str=co;

text.setText(str);

}

});

//時間事件

time.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e){

if(btime==false){

String st=(new Date()).toString();

text.setText(st);

str="";

btime=true;

}

else{

text.setText(str);

btime=false;

}

}

});

//+/-事件

sign.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e){

int a=Integer.valueOf(str);

a=a*(-1);

str=String.valueOf(a);

text.setText(str);

}

});

}

//定義1-9按鈕在text中顯示的內部類

class actionlistener1 implements ActionListener{

public void actionPerformed(ActionEvent e){

JButton button=(JButton)e.getSource();

String btext=button.getText();

//如果第一位為0再輸入其他非零的整數時將零忽略

if(bo){

if(str.indexOf("0")==0str.length()==1){

str="";

str+=btext;

text.setText(str);

}else{

str="";

str+=btext;

text.setText(str);}

}else{

if(str.indexOf("0")==0str.length()==1){

str="";

str+=btext;

text.setText(str);

}else{

str+=btext;

text.setText(str);

}

}

bo=false;

}

}

//定義清空text中內容的內部類

class actionlistener2 implements ActionListener{

public void actionPerformed(ActionEvent e){

str="";

text.setText("0.");

}

}

//定義+、-、*、/、%運算的內部類

class actionlistener3 implements ActionListener{

public void actionPerformed(ActionEvent e){

int count;

count=str.length();

if(count!=0){

JButton button=(JButton)e.getSource();

opr=button.getText();

op1=Float.parseFloat(str);

bo=true;

}

else

System.out.println("您現在的按鍵毫無意義！");

}

}

public static void main(String[] args){

Calculator cc=new Calculator();

cc.pack();

cc.setResizable(false);//不可最大化

cc.setVisible(true);

cc.setTitle("計算器");

cc.setDefaultCloseOperation(EXIT_ON_CLOSE);

Dimension scmsize=Toolkit.getDefaultToolkit().getScreenSize();

int w=cc.getSize().width;

int h=cc.getSize().height;

int x=(scmsize.width-w)/2;

int y=(scmsize.height-h)/2;

cc.setLocation(x, y);

}

}