网上科普有关“java编程实现计算器”话题很是火热，小编也是针对java编程实现计算器寻找了一些与之相关的一些信息进行分析，如果能碰巧解决你现在面临的问题，希望能够帮助到您。

import java.awt.BorderLayout;

import java.awt.Button;

import java.awt.Color;

import java.awt.Dialog;

import java.awt.Dimension;

import java.awt.FlowLayout;

import java.awt.Frame;

import java.awt.GridLayout;

import java.awt.Label;

import java.awt.Menu;

import java.awt.MenuBar;

import java.awt.MenuItem;

import java.awt.Panel;

import java.awt.TextField;

import java.awt.Toolkit;

import java.awt.datatransfer.Clipboard;

import java.awt.datatransfer.StringSelection;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;

public class Calculator extends Frame implements ActionListener {

private String s_show;

private String s_go;

Panel p1 = new Panel();

Panel p2 = new Panel();

Panel p3=new Panel();

Oper do1 = new Oper();

TextField textfields = new TextField(27);

Dialog dlog=new Dialog(this,"about us");

Label aboutlab=new Label();

String s1;

String sedit;

Button buttons1 = new Button("Backspace");

int screenWidth,screenHeight;

Clipboard clp=Toolkit.getDefaultToolkit().getSystemClipboard();

Calculator() {

this.addWindowListener(new WindowAdapter() {

public void windowClosing(WindowEvent e) {

System.exit(0);

}

});

MenuBar mbr=new MenuBar();

setMenuBar(mbr);

Menu edit=new Menu(" do ");

MenuItem copy=new MenuItem("Copy Ctrl+C");

MenuItem zhantie=new MenuItem(" Ctrl+V");

MenuItem exit=new MenuItem("Close Alt+F4");

edit.add(copy);

edit.add(zhantie);

mbr.add(edit);

Menu help=new Menu(" help ");

MenuItem help1=new MenuItem("help theme");

MenuItem about=new MenuItem("about us");

dlog.setAlwaysOnTop(true);

dlog.setResizable(false);

//dlog.setEnabled(false);

s1="学习时兴趣小组做的";

aboutlab.setSize(200, 150);

aboutlab.setText(s1);

dlog.add(aboutlab);

about.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e){

dlog.setVisible(true);

}

});

dlog.addWindowListener(new WindowAdapter(){

public void windowClosing(WindowEvent e){

dlog.setVisible(false);

}

});

help.add(help1);

help.add(about);

mbr.add(help);

p1.setBackground(Color.lightGray);

p1.setForeground(Color.red);

p2.setBackground(Color.lightGray);

p2.setForeground(Color.blue);

p1.setLayout(new FlowLayout(FlowLayout.RIGHT, 1,1));

p1.add(textfields);

p1.add(buttons1);

buttons1.addActionListener(this);

p2.setLayout(new GridLayout(5, 4, 10, 16));

this.add(p1, BorderLayout.CENTER);

this.add(p2, BorderLayout.SOUTH);

this.setTitle("Play the window");

this.setResizable(false);

this.setAlwaysOnTop(true);

/**textfields.addKeyListener(new KeyAdapter(){

public void keyTyped(KeyEvent e){

char c=e.getKeyChar();

String textfieldsstr=textfields.toString();

switch(c){

case 1:textfields.setText(textfieldsstr+1);break;

case 2:textfields.setText(textfields.toString()+2);break;

case 3:textfields.setText(textfields.toString()+3);break;

case 4:textfields.setText(textfields.toString()+4);break;

case 5:textfields.setText(textfields.toString()+5);break;

case 6:textfields.setText(textfields.toString()+6);break;

case 7:textfields.setText(textfields.toString()+7);break;

case 8:textfields.setText(textfields.toString()+8);break;

case 9:textfields.setText(textfields.toString()+9);break;

case 0:textfields.setText(textfields.toString()+0);break;

case '*':textfields.setText(textfields.toString()+"*");break;

}

/**if(e.getKeyChar()==1){

textfields.setText(textfields.toString()+1);

}

}

});*///未实现键盘监听

Toolkit tk=Toolkit.getDefaultToolkit();

Dimension screenSize = tk.getScreenSize();

screenWidth=screenSize.width;

screenHeight=screenSize.height;

this.setBounds(screenWidth/2-150, screenHeight/2-128, 300, 256);

dlog.setBounds(screenWidth/2-100, screenHeight/2-78, 200, 150);

int i, j = 0, k = 9, r1 = 0, r2 = 0, r3 = 0;

for (i = 0; i < 20; i++) {

j++;

if (j == 4) {

j = 0;

r1++;

Button buttons2_i = new Button();

p2.add(buttons2_i);

buttons2_i.setBackground(Color.cyan);

buttons2_i.addActionListener(this);

switch (r1) {

case 1:

buttons2_i.setLabel("+");

break;

case 2:

buttons2_i.setLabel("-");

break;

case 3:

buttons2_i.setLabel("*");

break;

case 4:

buttons2_i.setLabel("/");

break;

case 5:

buttons2_i.setLabel("=");

break;

}

}// endif

else // else1

{

if (i < 3) {

r2++;

Button buttons2_i = new Button(""); //

p2.add(buttons2_i);

buttons2_i.setBackground(Color.cyan);

buttons2_i.addActionListener(this);

switch (r2) {

case 1:

buttons2_i.setLabel("(");

break;

case 2:

buttons2_i.setLabel(")");

break;

case 3:

buttons2_i.setLabel("sqrt");

break;

}

}// endif

else {

if (i > 16 && i < 19) {

r3++;

Button buttons2_i = new Button("");

p2.add(buttons2_i);

buttons2_i.addActionListener(this);

switch (r3) {

case 1:

buttons2_i.setLabel(".");

break;

case 2:

buttons2_i.setLabel("CE");

break;

}

}// endif

else {

Integer name = new Integer(k);

k--;

s_show = name.toString();

Button buttons2_i = new Button(s_show);

p2.add(buttons2_i);

buttons2_i.addActionListener(this);

}

}

}// end else1

}// end for

s_show = "";

s_go = "";

this.setVisible(true);

}// end Calculator()构造方法

public void actionPerformed(ActionEvent e) {

if (e.getSource() instanceof Button) // if1

{

if (e.getActionCommand() == "CE")// Del

{

s_show = "";

s_go = "";

textfields.setText(s_show);

} else if (e.getActionCommand() == "Backspace") {

if (s_show.equals("")) {

s_go = "";

textfields.setText("");

} else {

if (s_go.length() > 0)

s_go = s_go.substring(0, s_go.length() - 1);

s_show = s_show.substring(0, s_show.length() - 1);

textfields.setText(s_show);

}

} else if (e.getActionCommand() == ".") {

if (textfields.getText().equals(""))

textfields.setText("0.");

else {

s_show += e.getActionCommand();

s_go += e.getActionCommand();

textfields.setText(s_show);

}

} else {

if (e.getActionCommand() != "=") {

if (e.getActionCommand().equals("sqrt")) {

s_show += e.getActionCommand();

s_go += e.getActionCommand();

textfields.setText(s_show);

s_go = s_go.substring(0, s_go.length() - 3);

} else {

s_show += e.getActionCommand();

s_go += e.getActionCommand();

textfields.setText(s_show);

}

} else {

s_show += e.getActionCommand();

s_go += e.getActionCommand();

textfields.setText(do1.operator(s_go)); // ().toString()

}

}// end else

}// end if1

if(e.getSource()=="copy"){

sedit=textfields.getSelectedText();

StringSelection text=new StringSelection(sedit);

clp.setContents(text, null);

}

/**else if(e.getSource()=="zhantie"){

Transferable contents=clp.getContents(this);//返回表示剪贴板当前内容的 transferable 对象。

DataFlavor flavor=DataFlavor.stringFlavor;//

String ss;

if (contents.isDataFlavorSupported(flavor)) {

try

{

int start=textfields.getSelectionStart();

int end=textfields.getSelectionEnd();

//textfields.replaceRange("",start,end);

textfields.setText(ss);

ss = (String)contents.getTransferData(flavor);

int n=textfields.getCaretPosition();

textfields.insert(ss,n);

}catch(Exception ee){

// TODO: handle exception

}

}

}*///未实现剪贴板粘贴功能

// end actionPerformed()

// end class Calculator

}

public static void main(String args[]) {

Calculator cal = new Calculator();

}

}

求一个简单的JAVA计算器代码

import java.awt.BorderLayout;

import java.awt.Button;

import java.awt.Frame;

import java.awt.GridLayout;

import java.awt.Panel;

import java.awt.TextField;

import java.awt.event.MouseEvent;

import java.awt.event.MouseListener;

import java.awt.event.WindowEvent;

import java.awt.event.WindowListener;

public class Calculator {

public static void main(String[] args) {

Frame f = new Frame("Calculator");

final TextField tf = new TextField();

Panel p = new Panel();

f.setLayout(new BorderLayout());

f.add(tf, BorderLayout.NORTH);

f.add(p, BorderLayout.CENTER);

p.setLayout(new GridLayout(4, 4));

Button one = new Button("1");

Button two = new Button("2");

Button three = new Button("3");

Button four = new Button("4");

Button five = new Button("5");

Button six = new Button("6");

Button seven = new Button("7");

Button eight = new Button("8");

Button nine = new Button("9");

Button zero = new Button("0");

Button add = new Button("+");

Button sub = new Button("-");

Button mul = new Button("*");

Button div = new Button("/");

Button decimal = new Button(".");

final Button equal = new Button("=");

p.add(one);

p.add(two);

p.add(three);

p.add(four);

p.add(five);

p.add(six);

p.add(seven);

p.add(eight);

p.add(nine);

p.add(zero);

p.add(add);

p.add(sub);

p.add(mul);

p.add(div);

p.add(decimal);

p.add(equal);

final String[] ary = {"", null, ""};

class NumMouseListener implements MouseListener{

public void mouseClicked(MouseEvent e) {

String num = ((Button)e.getSource()).getLabel().trim();

if(ary[1] == null){

ary[0] = ary[0] + "" + num;

}else{

ary[2] = ary[2] + "" + num;

}

tf.setText(tf.getText() + "" + num);

}

public void mouseEntered(MouseEvent e) {}

public void mouseExited(MouseEvent e) {}

public void mousePressed(MouseEvent e) {}

public void mouseReleased(MouseEvent e) {}

}

one.addMouseListener(new NumMouseListener());

two.addMouseListener(new NumMouseListener());

three.addMouseListener(new NumMouseListener());

four.addMouseListener(new NumMouseListener());

five.addMouseListener(new NumMouseListener());

six.addMouseListener(new NumMouseListener());

seven.addMouseListener(new NumMouseListener());

eight.addMouseListener(new NumMouseListener());

nine.addMouseListener(new NumMouseListener());

zero.addMouseListener(new NumMouseListener());

class OperatotrMouseListener implements MouseListener{

public void mouseClicked(MouseEvent e) {

if(e.getSource() == equal){

try {

long result = calculate(Integer.parseInt(ary[0]), Integer.parseInt(ary[2]), ary[1]);

tf.setText(String.valueOf(result));

ary[0] = tf.getText();

ary[1] = null;

ary[2] = "";

} catch (Exception e1) {

e1.printStackTrace();

}

}else{

ary[1] = ((Button) e.getSource()).getLabel();

if(ary[0].length() > 0){

ary[2] = "";

}else{

ary[0] = String.valueOf(tf.getText());

}

tf.setText("");

}

}

private long calculate(int i, int j, String operator) throws Exception {

if(operator.equals("+")){

return i + j;

}else if(operator.equals("-")){

return i - j;

}else if(operator.equals("*")){

return i * j;

}else if(operator.equals("/")){

return i / j;

}else{

throw new Exception("Invalid operator.(Only +-/* accepted");

}

}

public void mouseEntered(MouseEvent e) {}

public void mouseExited(MouseEvent e) {}

public void mousePressed(MouseEvent e) {}

public void mouseReleased(MouseEvent e) {}

}

add.addMouseListener(new OperatotrMouseListener());

mul.addMouseListener(new OperatotrMouseListener());

div.addMouseListener(new OperatotrMouseListener());

sub.addMouseListener(new OperatotrMouseListener());

equal.addMouseListener(new OperatotrMouseListener());

f.addWindowListener(new WindowListener(){

public void windowClosing(WindowEvent e) {

System.exit(0);

}

public void windowActivated(WindowEvent e) {}

public void windowClosed(WindowEvent e) {}

public void windowDeactivated(WindowEvent e) {}

public void windowDeiconified(WindowEvent e) {}

public void windowIconified(WindowEvent e) {}

public void windowOpened(WindowEvent e) {}

});

f.setVisible(true);

f.setBounds(200, 200, 250, 250);

f.validate();

}

}

import java.awt.*;

import javax.swing.*;

import java.awt.event.*;

class Counter extends WindowAdapter

{

static JFrame f=new JFrame("计算器");

static JTextField text1=new JTextField("0.");

static String source="";

static String cal="";

static String object="";

static boolean flag=false;

static boolean flag1=true;

static boolean flag2=false;

public void init()

{

try

{

Container c=f.getContentPane();

JPanel pan1=new JPanel();

JButton b1=new JButton("1");

JButton b2=new JButton("2");

JButton b3=new JButton("3");

JButton b4=new JButton("4");

JButton b5=new JButton("5");

JButton b6=new JButton("6");

JButton b7=new JButton("7");

JButton b8=new JButton("8");

JButton b9=new JButton("9");

JButton b0=new JButton("0");

JButton b11=new JButton("+");

JButton b12=new JButton("-");

JButton b13=new JButton("*");

JButton b14=new JButton("/");

JButton b15=new JButton(".");

JButton b16=new JButton("=");

JButton bclar=new JButton("清零");

text1.setHorizontalAlignment(JTextField.RIGHT);

c.add(text1,"North");

c.add(pan1);

A aa=new A();

Result re=new Result();

Opertion op=new Opertion();

Clar cl=new Clar();

b1.addActionListener(aa);

b2.addActionListener(aa);

b3.addActionListener(aa);

b4.addActionListener(aa);

b5.addActionListener(aa);

b6.addActionListener(aa);

b7.addActionListener(aa);

b8.addActionListener(aa);

b9.addActionListener(aa);

b0.addActionListener(aa);

b11.addActionListener(op);

b12.addActionListener(op);

b13.addActionListener(op);

b14.addActionListener(op);

b16.addActionListener(re);

b15.addActionListener(aa);

bclar.addActionListener(cl);

pan1.add(b1);

pan1.add(b2);

pan1.add(b3);

pan1.add(b11);

pan1.add(b4);

pan1.add(b5);

pan1.add(b6);

pan1.add(b12);

pan1.add(b7);

pan1.add(b8);

pan1.add(b9);

pan1.add(b13);

pan1.add(b0);

pan1.add(b15);

pan1.add(b16);

pan1.add(b14);

pan1.add(bclar);

f.setSize(200,220);

f.setVisible(true);

}

catch(Exception e)

{

System.out.println(e.getMessage());

}

}

class A implements ActionListener

{

public void actionPerformed(ActionEvent e)

{

String a=text1.getText();

String s=e.getActionCommand();

if(a.equals("0.")||a.equals("+")||a.equals("-")||a.equals("*")||a.equals("/"))

text1.setText(s);

else {

if(flag2)

{

text1.setText(s);

flag2=false;

}

else

text1.setText(a+s);

}

}

}

class Opertion implements ActionListener

{

public void actionPerformed(ActionEvent e)

{

cal=e.getActionCommand();

if(flag1==true)

source=text1.getText();

text1.setText(cal);

flag1=false;

flag=true;

}

}

class Result implements ActionListener

{

public void actionPerformed(ActionEvent e)

{

double num1;

num1=Double.parseDouble(source);

object=text1.getText();

double num2;

num2=Double.parseDouble(object);

double result=0;

if(cal.equals("+"))

result=num1+num2;

if(cal.equals("-"))

result=num1-num2;

if(cal.equals("*"))

result=num1*num2;

if(cal.equals("/"))

if(num2==0)

text1.setText("除数不能为0");

else

result=num1/num2;

String s1=Double.toString(result);

text1.setText(s1);

flag1=true;

flag2=true;

}

}

class Clar implements ActionListener

{

public void actionPerformed(ActionEvent e)

{

text1.setText("0.");

}

}

public static void main(String[] args)

{

Counter count=new Counter();

count.init();

}

public void windowClosing(WindowEvent e){

System.exit(1);

}

public void windowOpened(WindowEvent e){}

public void windowIconified(WindowEvent e){}

public void windowDeiconified(WindowEvent e){}

public void windowClosed(WindowEvent e){}

public void windowActivated(WindowEvent e){}

public void windowDeactivated(WindowEvent e){}

}

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