java计算器代码 java计算器代码算法
用JAVA编写的科学计算器源代码
import java.awt.*;
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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){}
}
java 计算器代码带括号 求注释
//引入各种类文件
import java.awt.Button;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.Frame;
import java.awt.GridLayout;
import java.awt.Panel;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
//定义JsqFrame继承Frame
class JsqFrame extends Frame {
double d1, d2; //定义两个double类型的变量
int op = -1; //定义两个int类型的变量
static TextField tf;//定义静态对象TextField
CalPanelL p1; //定义CalPanelL对象
// Constructor构造方法
JsqFrame() {
//以下设置属性
super("计算器");
setLayout(new FlowLayout());
setResizable(false);
setSize(250, 250);
tf = new TextField(18);
tf.setEditable(false);
tf.setBackground(Color.lightGray);
tf.setForeground(Color.red);
tf.setFont(new Font("Arial", Font.BOLD, 16));
add(tf);
p1 = new CalPanelL();
add(p1);
setVisible(true);
// addWindowListener(new Wclose());
}
//添加按钮继承Button类
class CalButton extends Button {
CalButton(String s) {
//设置按钮属性
super(s);
setBackground(Color.WHITE); //设置颜色为白色
}
}
//定义显示器继承Panel类
class CalPanelL extends Panel {
CalButton a, c, b0, b1, b2, b3, b4, b5, b6, b7, b8, b9, bPN, bPoint,
bAdd, bSub, bMul, bDiv, bL, bR, bLn, bEqual, bCE, bQuit;
CalPanelL() {
//设置显示器的属性
setLayout(new GridLayout(6, 4));
setFont(new Font("TimesRoman", Font.BOLD, 16));
a = new CalButton("");
c = new CalButton("");
b0 = new CalButton("0");
b1 = new CalButton("1");
b2 = new CalButton("2");
b3 = new CalButton("3");
b4 = new CalButton("4");
b5 = new CalButton("5");
b6 = new CalButton("6");
b7 = new CalButton("7");
b8 = new CalButton("8");
b9 = new CalButton("9");
bPN = new CalButton("+/-");
bPoint = new CalButton(".");
// 设置按钮
bAdd = new CalButton("+");
bSub = new CalButton("-");
bMul = new CalButton("*");
bDiv = new CalButton("/");
bL = new CalButton("(");
bR = new CalButton(")");
bLn = new CalButton("ln");
bEqual = new CalButton("=");
bCE = new CalButton("CE");
bQuit = new CalButton("退出");
// 加入按钮
add(a);
add(c);
add(bCE);
bCE.addActionListener(new PressBCE());
add(bQuit);
bQuit.addActionListener(new PressBQuit());
add(b7);
b7.addActionListener(new PressB7());
add(b8);
b8.addActionListener(new PressB8());
add(b9);
b9.addActionListener(new PressB9());
add(bDiv);
bDiv.addActionListener(new PressBDiv());
add(b4);
b4.addActionListener(new PressB4());
add(b5);
b5.addActionListener(new PressB5());
add(b6);
b6.addActionListener(new PressB6());
add(bMul);
bMul.addActionListener(new PressBMul());
add(b1);
b1.addActionListener(new PressB1());
add(b2);
b2.addActionListener(new PressB2());
add(b3);
b3.addActionListener(new PressB3());
add(bSub);
bSub.addActionListener(new PressBSub());
add(b0);
b0.addActionListener(new PressB0());
add(bPoint);
bPoint.addActionListener(new PressBPoint());
add(bPN);
bPN.addActionListener(new PressBPN());
;
add(bAdd);
bAdd.addActionListener(new PressBAdd());
add(bL);
bL.addActionListener(new PressBL());
add(bR);
bR.addActionListener(new PressBR());
add(bLn);
bLn.addActionListener(new PressBLn());
add(bEqual);
bEqual.addActionListener(new PressBEqual());
}
}
//定义PressBAdd实现ActionListener
//大体的意思是按计算机按键的时出发的时间，设置按键的监听[加号的监听事件]
class PressBAdd implements ActionListener {
public void actionPerformed(ActionEvent e) {
try {
String d1 = tf.getText();
op = 0;
tf.setText(d1 + "+");
} catch (Exception ee) {
}
}
}
//定义PressBSub实现ActionListener
//大体的意思是按计算机按键的时出发的时间，设置按键的监听[减号的监听事件]
class PressBSub implements ActionListener {
public void actionPerformed(ActionEvent e) {
try {
String d1 = tf.getText();
op = 1;
tf.setText(d1 + "-");
} catch (Exception ee) {
}
}
}
//定义PressBMul实现ActionListener
//大体的意思是按计算机按键的时出发的时间，设置按键的监听[乘号的监听事件]
class PressBMul implements ActionListener {
public void actionPerformed(ActionEvent e) {
try {
String d1 = tf.getText();
op = 2;
tf.setText(d1 + "*");
} catch (Exception ee) {
}
}
}
//定义PressBDiv实现ActionListener
//大体的意思是按计算机按键的时出发的时间，设置按键的监听[除号的监听事件]
class PressBDiv implements ActionListener {
public void actionPerformed(ActionEvent e) {
try {
String d1 = tf.getText();
op = 3;
tf.setText(d1 + "/");
} catch (Exception ee) {
}
}
}
//定义PressBL实现ActionListener
//大体的意思是按计算机按键的时出发的时间，设置按键的监听[向左键的监听事件]
class PressBL implements ActionListener {
public void actionPerformed(ActionEvent e) {
try {
String d1 = tf.getText();
op = 3;
tf.setText(d1 + "(");
} catch (Exception ee) {
}
}
}
//定义PressBR实现ActionListener
//大体的意思是按计算机按键的时出发的时间，设置按键的监听[向右键的监听事件]
class PressBR implements ActionListener {
public void actionPerformed(ActionEvent e) {
try {
String d1 = tf.getText();
op = 3;
tf.setText(d1 + ")");
} catch (Exception ee) {
}
}
}
//定义PressBEqual实现ActionListener
//大体的意思是按计算机按键的时出发的时间，设置按键的监听[等号的监听事件]
class PressBEqual implements ActionListener {
public void actionPerformed(ActionEvent e) {
try {
Jsq jsq = new Jsq();
String s = tf.getText();
System.out.println(s);
while (s.indexOf("(") + 1 0 s.indexOf(")") 0) {
String s1 = jsq.caculateHigh(s);
System.out.println(s1);
s = s1;
}
String str = jsq.cacluteMain(s);
System.out.println(str);
tf.setText(String.valueOf(str));
} catch (Exception ee) {
}
}
}
/*
* 批量写吧
* 以下是按1、2、3等等的监听事件
* 还有清零的等等监听事件
*/
class PressBLn implements ActionListener {
public void actionPerformed(ActionEvent e) {
try {
double x = Double.parseDouble(tf.getText());
double y;
y = Math.log10(x);
tf.setText(y + "");
} catch (Exception ee) {
}
}
}
class PressBCE implements ActionListener {
public void actionPerformed(ActionEvent e) {
tf.setText("");
}
}
class PressBPN implements ActionListener {
public void actionPerformed(ActionEvent e) {
try {
String text = tf.getText();
if (text != "") {
if (text.charAt(0) == '-')
tf.setText(text.substring(1));
else if (text.charAt(0) = '0' text.charAt(0) = '9')
tf.setText("-" + text.substring(0));
else if (text.charAt(0) == '.')
tf.setText("-0" + text.substring(0));
}
} catch (Exception ee) {
}
}
}
class PressBPoint implements ActionListener {
public void actionPerformed(ActionEvent e) {
String text = tf.getText();
if (text.lastIndexOf(".") == -1)
tf.setText(text + ".");
}
}
class PressB0 implements ActionListener {
public void actionPerformed(ActionEvent e) {
String text = tf.getText();
tf.setText(text + "0");
}
}
class PressB1 implements ActionListener {
public void actionPerformed(ActionEvent e) {
String text = tf.getText();
tf.setText(text + "1");
}
}
class PressB2 implements ActionListener {
public void actionPerformed(ActionEvent e) {
String text = tf.getText();
tf.setText(text + "2");
}
}
class PressB3 implements ActionListener {
public void actionPerformed(ActionEvent e) {
String text = tf.getText();
tf.setText(text + "3");
}
}
class PressB4 implements ActionListener {
public void actionPerformed(ActionEvent e) {
String text = tf.getText();
tf.setText(text + "4");
}
}
class PressB5 implements ActionListener {
public void actionPerformed(ActionEvent e) {
String text = tf.getText();
tf.setText(text + "5");
}
}
class PressB6 implements ActionListener {
public void actionPerformed(ActionEvent e) {
String text = tf.getText();
tf.setText(text + "6");
}
}
class PressB7 implements ActionListener {
public void actionPerformed(ActionEvent e) {
String text = tf.getText();
tf.setText(text + "7");
}
}
class PressB8 implements ActionListener {
public void actionPerformed(ActionEvent e) {
String text = tf.getText();
tf.setText(text + "8");
}
}
class PressB9 implements ActionListener {
public void actionPerformed(ActionEvent e) {
String text = tf.getText();
tf.setText(text + "9");
}
}
class PressBQuit implements ActionListener {
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
}
public void Js() {
String text = tf.getText();
tf.setText(text);
}
}
计算器java代码
import java.awt.Color;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.WindowConstants;
import javax.swing.border.LineBorder;
class Normal{
double i,j;
public Normal(double num1,double num2){
i=num1;
j=num2;
}
public double puls(){
return i+j;
}
public double subtract(){
return i-j;
}
public double multiply(){
return i*j;
}
public double divide(){
return i/j;
}
public double surpuls(){
return i%j;
}
}
class scientific extends Normal{
public scientific(int num1, int num2) {
super(num1, num2);
}
}
public class calc extends JFrame{
public static void main(String[] args) {
viewNormal VN= new viewNormal("normal");
}
}
class viewNormal extends JFrame implements ActionListener{
JPanel jp1 = new JPanel(new GridLayout(4,3,5,5));
JPanel jp2 = new JPanel(new GridLayout(5,1,5,5));
JLabel jl;
JButton[] jb;
JButton jbs,jbo,jba,jbb,jbc,jby;
StringBuffer sb = new StringBuffer();
Normal normal;
int dot=0;
double fnum=0;
double lnum=0;
double result;
String sign=null;
public viewNormal(String title){
setTitle(title);
setLayout(null);
setVisible(true);
setBounds(200,200,305,350);
setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
jb= new JButton[12];
for(int i=0;i9;i++){
jb[i]=new JButton(""+(i+1));
jp1.add(jb[i]);
jb[i].addActionListener(this);
}
jb[9]=new JButton(".");
jb[10]=new JButton("0");
jb[11]=new JButton("=");
jb[9].addActionListener(this);
jb[10].addActionListener(this);
jb[11].addActionListener(this);
jp1.add(jb[9]);
jp1.add(jb[10]);
jp1.add(jb[11]);
jp1.setBounds(10, 100, 200, 200);
jbs= new JButton("+");jbo= new JButton("-");jba= new JButton("*");
jbb= new JButton("/");jby= new JButton("%");jbc= new JButton("C");
jbs.addActionListener(this);jbo.addActionListener(this);jba.addActionListener(this);
jbb.addActionListener(this);jby.addActionListener(this);jbc.addActionListener(this);
//jp2.add(jby);
jp2.add(jbs);jp2.add(jbo);jp2.add(jba);jp2.add(jbb);jp2.add(jbc);
jp2.setBounds(215, 100, 70, 200);
jl= new JLabel("0",JLabel.RIGHT);
jl.setFont(new Font("Batang",Font.BOLD, 20));
jl.setBorder(new LineBorder(Color.black,2));
jl.setBackground(Color.white);
jl.setBounds(10, 40, 275, 50);
jl.setOpaque(true);
add(jl);
add(jp1);
add(jp2);
}
//+
public void sum(){
lnum=Double.parseDouble(sb.toString());
normal=new Normal(fnum,lnum);
fnum=normal.puls();
result=fnum;
}
//-
private void sub() {
System.out.println(sb.toString());
lnum=Double.parseDouble(sb.toString());
normal=new Normal(fnum,lnum);
fnum=normal.subtract();
result=fnum;
}
//*
private void mul() {
lnum=Double.parseDouble(sb.toString());
normal=new Normal(fnum,lnum);
fnum=normal.multiply();
result=fnum;
}
// /
private void div() {
lnum=Double.parseDouble(sb.toString());
normal=new Normal(fnum,lnum);
fnum=normal.divide();
result=fnum;
}
//%
private void sur() {
lnum=Double.parseDouble(sb.toString());
normal=new Normal(fnum,lnum);
fnum=normal.surpuls();
result=fnum;
}
// =
private void same(){
if(sign.equals("+")){
sum();
}
if(sign.equals("-")){
sub();
}
if(sign.equals("*")){
mul();
}
if(sign.equals("/")){
div();
}
if(sign.equals("%")){
sur();
}
}
//result
public void Result(){
if(result%1!=0)
jl.setText(""+result);
else
{
int i=(int)result;
jl.setText(""+i);
}
}
@Override
public void actionPerformed(ActionEvent e) {
//System.out.println(sb.toString());
// 1~9
for(int i=0;i9;i++){
if(e.getSource()==jb[i]!sb.toString().equals("0")){
sb.append(jb[i].getText());
jl.setText(sb.toString());
}
else if(e.getSource()==jb[i]sb.toString().equals("0")){
int d=sb.length();
sb.delete(0, d);
sb.append(jb[i].getText());
jl.setText(sb.toString());
}
}
// 0
if(e.getSource()==jb[10]!sb.toString().equals("0")){
sb.append(jb[10].getText());
jl.setText(sb.toString());
}
// .
if(e.getSource()==jb[9]dot==0!sb.toString().equals("")){
dot++;
sb.append(jb[9].getText());
jl.setText(sb.toString());
}
// =
if(e.getSource()==jb[11]!sb.toString().equals("")){
same();
Result();
int d=sb.length();
sb.delete(0, d);
dot=0;
}
// +
if(e.getSource()==jbs!sb.toString().equals("")){
if(sign!="+"sign!=null)
same();
else
sum();
sign ="+";
Result();
int d=sb.length();
sb.delete(0, d);
dot=0;
}
//-
if(e.getSource()==jbo!sb.toString().equals("")){
if(fnum==0)
fnum=2*Double.parseDouble(sb.toString());
if(sign!="-"sign!=null)
same();
else
sub();
sign ="-";
Result();
int d=sb.length();
sb.delete(0, d);
dot=0;
}
//*
if(e.getSource()==jba!sb.toString().equals("")){
if(fnum==0)
fnum=1;
if(sign!="*"sign!=null)
same();
else
mul();
sign ="*";
Result();
int d=sb.length();
sb.delete(0, d);
dot=0;
}
// /
if(e.getSource()==jbb!sb.toString().equals("")){
if(fnum==0)
fnum=Math.pow(Double.parseDouble(sb.toString()),2);
if(sign!="/"sign!=null)
same();
else
div();
sign ="/";
Result();
int d=sb.length();
sb.delete(0, d);
dot=0;
}
//%
// if(e.getSource()==jby!sb.toString().equals("")){
// if(fnum==0){
// fnum=Double.parseDouble(sb.toString());
// result=fnum;
// }
// else {
// if(sign!="%"sign!=null)
// same();
// else{
// lnum=Double.parseDouble(sb.toString());
// normal=new Normal(fnum,lnum);
// fnum=normal.surpuls();
// result=fnum;
// }
// }
// sign ="%";
// Result();
// int d=sb.length();
// sb.delete(0, d);
// dot=0;
// }
//clear
if(e.getSource()==jbc){
int d=sb.length();
sb.delete(0, d);
jl.setText("0");
dot=0;
fnum=0;
lnum=0;
sign=null;
}
}
}
class viewScientific extends viewNormal{
public viewScientific(String title){
super(title);
setBounds(200,200,800,500);
}
}
//等号以后输入符号用不了， String转 double 本来就有错误，你可以用我的扩展成科学型的。
如何用JAVA语言编写计算器小程序？
具体代码如下：
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
public class Calculator extends JFrame implements ActionListener {
private JFrame jf;
private JButton[] allButtons;
private JButton clearButton;
private JTextField jtf;
public Calculator() {
//对图形组件实例化
jf=new JFrame("任静的计算器1.0：JAVA版");
jf.addWindowListener(new WindowAdapter(){
public void windowClosing(){
System.exit(0);
}
});
allButtons=new JButton[16];
clearButton=new JButton("清除");
jtf=new JTextField(25);
jtf.setEditable(false);
String str="123+456-789*0.=/";
for(int i=0;iallButtons.length;i++){
allButtons[i]=new JButton(str.substring(i,i+1));
}
}
public void init(){
//完成布局
jf.setLayout(new BorderLayout());
JPanel northPanel=new JPanel();
JPanel centerPanel=new JPanel();
JPanel southPanel=new JPanel();
northPanel.setLayout(new FlowLayout());
centerPanel.setLayout(new GridLayout(4,4));
southPanel.setLayout(new FlowLayout());
northPanel.add(jtf);
for(int i=0;i16;i++){
centerPanel.add(allButtons[i]);
}
southPanel.add(clearButton);
jf.add(northPanel,BorderLayout.NORTH);
jf.add(centerPanel,BorderLayout.CENTER);
jf.add(southPanel,BorderLayout.SOUTH);
addEventHandler();
}
//添加事件监听
public void addEventHandler(){
jtf.addActionListener(this);
for(int i=0;iallButtons.length;i++){
allButtons[i].addActionListener(this);
}
clearButton.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
Calculator.this.jtf.setText("");
}
});
}
//事件处理
public void actionPerformed(ActionEvent e) {
//在这里完成事件处理 使计算器可以运行
String action=e.getActionCommand();
if(action=="+"||action=="-"||action=="*"||action=="/"){
}
}
public void setFontAndColor(){
Font f=new Font("宋体",Font.BOLD,24);
jtf.setFont(f);
jtf.setBackground(new Color(0x8f,0xa0,0xfb));
for(int i=0;i16;i++){
allButtons[i].setFont(f);
allButtons[i].setForeground(Color.RED);
}
}
public void showMe(){
init();
setFontAndColor();
jf.pack();
jf.setVisible(true);
jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public static void main(String[] args){
new Calculator().showMe();
}
}
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