java简便计算器代码 java编写一个简易计算器程序
用java实现一个简单的计算器。
/*
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* @(#)JCalculator.java 1.00 06/17/2015
*/
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
/**
* A simple calculator program.
* pI saw this program in a QQ group, and help a friend correct it./p
*
* @author Singyuen Yip
* @version 1.00 12/29/2009
* @see JFrame
* @see ActionListener
*/
public class JCalculator extends JFrame implements ActionListener {
/**
* Serial Version UID
*/
private static final long serialVersionUID = -169068472193786457L;
/**
* This class help close the Window.
* @author Singyuen Yip
*
*/
private class WindowCloser extends WindowAdapter {
public void windowClosing(WindowEvent we) {
System.exit(0);
}
}
int i;
// Strings for Digit Operator buttons.
private final String[] str = { "7", "8", "9", "/", "4", "5", "6", "*","1",
"2", "3", "-", ".", "0", "=", "+" };
// Build buttons.
JButton[] buttons = new JButton[str.length];
// For cancel or reset.
JButton reset = new JButton("CE");
// Build the text field to show the result.
JTextField display = new JTextField("0");
/**
* Constructor without parameters.
*/
public JCalculator() {
super("Calculator");
// Add a panel.
JPanel panel1 = new JPanel(new GridLayout(4, 4));
// panel1.setLayout(new GridLayout(4,4));
for (i = 0; i str.length; i++) {
buttons[i] = new JButton(str[i]);
panel1.add(buttons[i]);
}
JPanel panel2 = new JPanel(new BorderLayout());
// panel2.setLayout(new BorderLayout());
panel2.add("Center", display);
panel2.add("East", reset);
// JPanel panel3 = new Panel();
getContentPane().setLayout(new BorderLayout());
getContentPane().add("North", panel2);
getContentPane().add("Center", panel1);
// Add action listener for each digit operator button.
for (i = 0; i str.length; i++)
buttons[i].addActionListener(this);
// Add listener for "reset" button.
reset.addActionListener(this);
// Add listener for "display" button.
display.addActionListener(this);
// The "close" button "X".
addWindowListener(new WindowCloser());
// Initialize the window size.
setSize(800, 800);
// Show the window.
// show(); Using show() while JDK version is below 1.5.
setVisible(true);
// Fit the certain size.
pack();
}
public void actionPerformed(ActionEvent e) {
Object target = e.getSource();
String label = e.getActionCommand();
if (target == reset)
handleReset();
else if ("0123456789.".indexOf(label) 0)
handleNumber(label);
else
handleOperator(label);
}
// Is the first digit pressed?
boolean isFirstDigit = true;
/**
* Number handling.
* @param key the key of the button.
*/
public void handleNumber(String key) {
if (isFirstDigit)
display.setText(key);
else if ((key.equals(".")) (display.getText().indexOf(".") 0))
display.setText(display.getText() + ".");
else if (!key.equals("."))
display.setText(display.getText() + key);
isFirstDigit = false;
}
/**
* Reset the calculator.
*/
public void handleReset() {
display.setText("0");
isFirstDigit = true;
operator = "=";
}
double number = 0.0;
String operator = "=";
/**
* Handling the operation.
* @param key pressed operator's key.
*/
public void handleOperator(String key) {
if (operator.equals("+"))
number += Double.valueOf(display.getText());
else if (operator.equals("-"))
number -= Double.valueOf(display.getText());
else if (operator.equals("*"))
number *= Double.valueOf(display.getText());
else if (operator.equals("/"))
number /= Double.valueOf(display.getText());
else if (operator.equals("="))
number = Double.valueOf(display.getText());
display.setText(String.valueOf(number));
operator = key;
isFirstDigit = true;
}
public static void main(String[] args) {
new JCalculator();
}
}
运行界面：
求大神发个完整简单的java计算器代码，
public static void main(String[] args) {
System.out.println("简单计算器");
boolean flag=true;//while循环是否继续，true继续循环，false停止循环
System.out.println("请输入第一个数字");
while(flag){
Scanner scan = new Scanner(System.in);
String bh=scan.next();
try {
double num = Double.parseDouble(bh);
System.out.println("请输入符号(+、-、*、/)");
while(1==1){
String fh=scan.next();
if("+".equals(fh) || "-".equals(fh) || "*".equals(fh) || "/".equals(fh)){
System.out.println("请输入第二个数字");
while(1==1){
String bh2=scan.next();
try {
double num2 = Double.parseDouble(bh2);
double num3=0;
if("+".equals(fh)){
num3=num+num2;
}else if("-".equals(fh)){
num3=num-num2;
}else if("*".equals(fh)){
num3=num*num2;
}else if("/".equals(fh)){
num3=num/num2;
}
System.out.println(num3);
break;
} catch (Exception e) {
System.out.println("请输入第二个正确的数字");
continue;
}
}
break;
}else{
System.out.println("请输入正确的符号(+、-、*、/)");
continue;
}
}
System.out.println("是否继续运算:输入Y或者y继续，输入其它任意字符退出");
String yn=scan.next();
if("Y".equals(yn) || "y".equals(yn)){
continue;
}else{
System.out.println("运算结束");
break;
}
}catch (NumberFormatException e) {//输入非数字类型时
System.out.println("请输入第一个正确的数字");
continue;
}
}
}
求JAVA简易计算器代码。
import javax.swing.SwingUtilities;
import javax.swing.JPanel;
import javax.swing.JFrame;
import javax.swing.JTextField;
import java.awt.Rectangle;
import javax.swing.JButton;
public class Calculator extends JFrame {
private static final long serialVersionUID = 1L;
private JPanel jContentPane = null;
private JTextField jTextField = null;
private JButton jButton = null;
private JButton jButton1 = null;
private JButton jButton2 = null;
private JButton jButton3 = null;
private JButton jButton4 = null;
private JButton jButton5 = null;
private JButton jButton6 = null;
private JButton jButton7 = null;
private JButton jButton8 = null;
private JButton jButton9 = null;
private JButton jButton10 = null;
private JButton jButton11 = null;
private JButton jButton12 = null;
private JButton jButton13 = null;
private JButton jButton14 = null;
private double first = 0;
private double second = 0;
private JButton jButton15 = null;
private JButton jButton16 = null;
private String way = "";
private double result = 0;
private char[] ch = new char[12];
private int i = 0;
/**
* This method initializes jTextField
*
* @return javax.swing.JTextField
*/
private JTextField getJTextField() {
if (jTextField == null) {
jTextField = new JTextField("0");
jTextField.setBounds(new Rectangle(60, 15, 234, 31));
jTextField.setHorizontalAlignment(JTextField.RIGHT);
}
return jTextField;
}
/**
* This method initializes jButton
*
* @return javax.swing.JButton
*/
private JButton getJButton() {
if (jButton == null) {
jButton = new JButton();
jButton.setBounds(new Rectangle(62, 74, 44, 37));
jButton.setText("1");
jButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent e) {
ch[i] = '1';
jTextField.setText(new String(ch).trim());
i++;
}
});
}
return jButton;
}
/**
* This method initializes jButton1
*
* @return javax.swing.JButton
*/
private JButton getJButton1() {
if (jButton1 == null) {
jButton1 = new JButton();
jButton1.setBounds(new Rectangle(119, 74, 44, 37));
jButton1.setText("2");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent e) {
ch[i] = '2';
jTextField.setText(new String(ch).trim());
i++;
}
});
}
return jButton1;
}
/**
* This method initializes jButton2
*
* @return javax.swing.JButton
*/
private JButton getJButton2() {
if (jButton2 == null) {
jButton2 = new JButton();
jButton2.setBounds(new Rectangle(176, 74, 44, 37));
jButton2.setText("3");
jButton2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent e) {
ch[i] = '3';
jTextField.setText(new String(ch).trim());
i++;
}
});
}
return jButton2;
}
/**
* This method initializes jButton3
*
* @return javax.swing.JButton
*/
private JButton getJButton3() {
if (jButton3 == null) {
jButton3 = new JButton();
jButton3.setBounds(new Rectangle(62, 129, 44, 37));
jButton3.setText("4");
jButton3.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent e) {
ch[i] = '4';
jTextField.setText(new String(ch).trim());
i++;
}
});
}
return jButton3;
}
/**
* This method initializes jButton4
*
* @return javax.swing.JButton
*/
private JButton getJButton4() {
if (jButton4 == null) {
jButton4 = new JButton();
jButton4.setBounds(new Rectangle(119, 129, 44, 37));
jButton4.setText("5");
jButton4.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent e) {
ch[i] = '5';
jTextField.setText(new String(ch).trim());
i++;
}
});
}
return jButton4;
}
/**
* This method initializes jButton5
*
* @return javax.swing.JButton
*/
private JButton getJButton5() {
if (jButton5 == null) {
jButton5 = new JButton();
jButton5.setBounds(new Rectangle(176, 129, 44, 37));
jButton5.setText("6");
jButton5.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent e) {
ch[i] = '6';
jTextField.setText(new String(ch).trim());
i++;
}
});
}
return jButton5;
}
/**
* This method initializes jButton6
*
* @return javax.swing.JButton
*/
private JButton getJButton6() {
if (jButton6 == null) {
jButton6 = new JButton();
jButton6.setBounds(new Rectangle(62, 184, 44, 37));
jButton6.setText("7");
jButton6.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent e) {
ch[i] = '7';
jTextField.setText(new String(ch).trim());
i++;
}
});
}
return jButton6;
}
/**
* This method initializes jButton7
*
* @return javax.swing.JButton
*/
private JButton getJButton7() {
if (jButton7 == null) {
jButton7 = new JButton();
jButton7.setBounds(new Rectangle(119, 184, 44, 37));
jButton7.setText("8");
jButton7.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent e) {
ch[i] = '8';
jTextField.setText(new String(ch).trim());
i++;
}
});
}
return jButton7;
}
/**
* This method initializes jButton8
*
* @return javax.swing.JButton
*/
private JButton getJButton8() {
if (jButton8 == null) {
jButton8 = new JButton();
jButton8.setBounds(new Rectangle(176, 184, 44, 37));
jButton8.setText("9");
jButton8.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent e) {
ch[i] = '9';
jTextField.setText(new String(ch).trim());
i++;
}
});
}
return jButton8;
}
/**
* This method initializes jButton9
*
* @return javax.swing.JButton
*/
private JButton getJButton9() {
if (jButton9 == null) {
jButton9 = new JButton();
jButton9.setBounds(new Rectangle(233, 74, 44, 37));
jButton9.setText("+");
jButton9.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent e) {
first = Double.parseDouble(jTextField.getText());
way = "+";
ch = new char[12];
i = 0;
jButton16.setEnabled(true);
}
});
}
return jButton9;
}
/**
* This method initializes jButton10
*
* @return javax.swing.JButton
*/
private JButton getJButton10() {
if (jButton10 == null) {
jButton10 = new JButton();
jButton10.setBounds(new Rectangle(290, 74, 44, 37));
jButton10.setText("-");
jButton10.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent e) {
first = Double.parseDouble(jTextField.getText());
way = "-";
ch = new char[12];
i = 0;
jButton16.setEnabled(true);
}
});
}
return jButton10;
}
/**
* This method initializes jButton11
*
* @return javax.swing.JButton
*/
private JButton getJButton11() {
if (jButton11 == null) {
jButton11 = new JButton();
jButton11.setBounds(new Rectangle(233, 129, 44, 37));
jButton11.setText("*");
jButton11.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent e) {
first = Double.parseDouble(jTextField.getText());
way = "*";
ch = new char[12];
i = 0;
jButton16.setEnabled(true);
}
});
}
return jButton11;
}
/**
* This method initializes jButton12
*
* @return javax.swing.JButton
*/
private JButton getJButton12() {
if (jButton12 == null) {
jButton12 = new JButton();
jButton12.setBounds(new Rectangle(290, 129, 44, 37));
jButton12.setText("/");
jButton12.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent e) {
first = Double.parseDouble(jTextField.getText());
way = "/";
ch = new char[12];
i = 0;
jButton16.setEnabled(true);
}
});
}
return jButton12;
}
/**
* This method initializes jButton13
*
* @return javax.swing.JButton
*/
private JButton getJButton13() {
if (jButton13 == null) {
jButton13 = new JButton();
jButton13.setBounds(new Rectangle(233, 184, 44, 37));
jButton13.setText("=");
jButton13.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent e) {
second = Double.parseDouble(jTextField.getText());
if (way.equals("")){
jTextField.setText(""+second);
}
if (way.equals("+")){
result = first + second;
jTextField.setText(""+result);
}
if (way.equals("-")){
result = first - second;
jTextField.setText(""+result);
}
if (way.equals("*")){
result = first * second;
jTextField.setText(""+result);
}
if(way.equals("/")){
if (second != 0){
result = first / second;
jTextField.setText(""+result);
}else{
jTextField.setText("error");
}
}
jButton16.setEnabled(true);
}
});
}
return jButton13;
}
/**
* This method initializes jButton14
*
* @return javax.swing.JButton
*/
private JButton getJButton14() {
if (jButton14 == null) {
jButton14 = new JButton();
jButton14.setBounds(new Rectangle(290, 184, 44, 37));
jButton14.setText("C");
jButton14.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent e) {
jTextField.setText("0");
first = 0;
second = 0;
way = "";
ch = new char[12];
i = 0;
jButton16.setEnabled(true);
}
});
}
return jButton14;
}
/**
* This method initializes jButton15
*
* @return javax.swing.JButton
*/
private JButton getJButton15() {
if (jButton15 == null) {
jButton15 = new JButton();
jButton15.setBounds(new Rectangle(62, 231, 102, 26));
jButton15.setText("0");
jButton15.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent e) {
ch[i] = '0';
jTextField.setText(new String(ch).trim());
i++;
}
});
}
return jButton15;
}
/**
* This method initializes jButton16
*
* @return javax.swing.JButton
*/
private JButton getJButton16() {
if (jButton16 == null) {
jButton16 = new JButton();
jButton16.setBounds(new Rectangle(176, 231, 44, 26));
jButton16.setText(".");
jButton16.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent e) {
if(ch[0] == 0){
ch[i] = '0';
ch[i+1] = '.';
i++;
}else{
ch[i] = '.';
}
jTextField.setText(new String(ch).trim());
i++;
jButton16.setEnabled(false);
}
});
}
return jButton16;
}
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
SwingUtilities.invokeLater(new Runnable() {
public void run() {
Calculator thisClass = new Calculator();
thisClass.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
thisClass.setVisible(true);
}
});
}
/**
* This is the default constructor
*/
public Calculator() {
super();
initialize();
}
/**
* This method initializes this
*
* @return void
*/
private void initialize() {
this.setSize(356, 298);
this.setContentPane(getJContentPane());
this.setTitle("计算器");
this.setResizable(false);
}
/**
* This method initializes jContentPane
*
* @return javax.swing.JPanel
*/
private JPanel getJContentPane() {
if (jContentPane == null) {
jContentPane = new JPanel();
jContentPane.setLayout(null);
jContentPane.add(getJTextField(), null);
jContentPane.add(getJButton(), null);
jContentPane.add(getJButton1(), null);
jContentPane.add(getJButton2(), null);
jContentPane.add(getJButton3(), null);
jContentPane.add(getJButton4(), null);
jContentPane.add(getJButton5(), null);
jContentPane.add(getJButton6(), null);
jContentPane.add(getJButton7(), null);
jContentPane.add(getJButton8(), null);
jContentPane.add(getJButton9(), null);
jContentPane.add(getJButton10(), null);
jContentPane.add(getJButton11(), null);
jContentPane.add(getJButton12(), null);
jContentPane.add(getJButton13(), null);
jContentPane.add(getJButton14(), null);
jContentPane.add(getJButton15(), null);
jContentPane.add(getJButton16(), null);
}
return jContentPane;
}
} // @jve:decl-index=0:visual-constraint="437,27"
哥们！这是用eclipse中的visual editor做的，所以代码比较多，复制粘贴不方便，我可以发你邮箱。你把代码打上去，一样能运行的！！！
JAVA 编写计算器 要代码最简单的
学java的时候自己编的，很简单，能够连续输入计算式后进行计算
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.NumberFormat;
import java.util.ArrayList;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
/**简易计算器，能够进行简单的计算
*
* @see 2008.12.9
*/
public class CalculatorA
implements ActionListener{
private JFrame frame;
private JTextField field;
private JButton[] allButtons;
private JButton clearButton;
// private JButton backButton;
String result="";//保存结果
StringBuilder sb = new StringBuilder();//保存要进行的计算式
int x = 0; //用来判断上一次的事件类型
String str = "123+456-789*0.=/";
ArrayListString arrayList = new ArrayListString();//保存计算式，通过方法进行运算
public CalculatorA(){
frame = new JFrame("我的计算器v1.1");
frame.setLocation(300,300);
field = new JTextField(25);
allButtons = new JButton[16];
for(int i=0;iallButtons.length;i++){
allButtons[i]= new JButton(str.substring(i,i+1));
}
clearButton = new JButton("CLEAR");
// backButton = new JButton("——");
init();
setFondAndColor();
addEventHander();
}
public void init(){
frame.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(field);
for(int i=0;iallButtons.length;i++){
centerPanel.add(allButtons[i]);
}
southPanel.add(clearButton);
//southPanel.add(backButton);
frame.add(northPanel,BorderLayout.NORTH);
frame.add(centerPanel,BorderLayout.CENTER);
frame.add(southPanel,BorderLayout.SOUTH);
}
//设置输入字体
public void setFondAndColor(){
field.setFont(new Font("宋体",Font.BOLD,24));
field.setBackground(new Color(100,200,200));
field.setForeground(Color.RED);
//设置字体从右起始
field.setHorizontalAlignment(JTextField.RIGHT);
}
public void showMi(){
frame.pack();
frame.setResizable(false);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public void addEventHander(){
for(int i=0;iallButtons.length;i++){
allButtons[i].addActionListener(this);
}
clearButton.addActionListener(this);
// backButton.addActionListener(this);
}
@Override
public void actionPerformed(ActionEvent e) {
String str = e.getActionCommand();//取得当前事件返回的值
if("0123456789.".indexOf(str)!=-1){
if(x == 0){ //当x为0时表示还没有进行输入
result=str;
sb.append(str);
field.setText(str);
x = 1;
}
else if(x == 1){
result = result +str;
sb.append(str);
field.setText(result);
x = 1;
}
else if(x == 2){
sb.delete(0,sb.length());
result = result+str;
sb.append(str);
field.setText(result);
x = 1;
}
else if(x == 3){
result = str;
sb.delete(0,sb.length());
arrayList.clear();
field.setText(str);
sb.append(str);
field.setText(str);
x = 1;
}
else if(x == 4){
result ="";
sb.delete(0,sb.length());
arrayList.clear();
result = str;
sb.append(str);
field.setText(str);
x = 1;
}
else{
result = result +str;
sb.append(str);
field.setText(result);
x = 1;
}
}
else if("+*-/".indexOf(str)!=-1){
if(x == 0){
field.setText("");
x = 2;
}
else if(x == 1){
result = result + str;
arrayList.add(sb.toString());
arrayList.add(str);
sb.append(str);
field.setText(result);
x = 2;
}
else if(x == 2){
x = 2;
}
else if(x == 3){
field.setText(result+str);
arrayList.add(result);
arrayList.add(str);
result = result+str;
x = 2;
}
else if(x == 4){
result ="";
sb.delete(0,sb.length());
arrayList.clear();
x = 2;
}
else{
field.setText(result+str);
arrayList.add(result);
arrayList.add(str);
result = result+str;
x = 2;
}
}
else if("=".equals(str)){
if(x == 0){
field.setText("0");
arrayList.clear();
result = "0";
x = 3;
}
else if(x == 1){
try{
arrayList.add(sb.toString());
arrayList = getResult(arrayList);
result = arrayList.get(0);
field.setText(result);
arrayList.clear();
x = 3;
}catch(Exception e1){
field.setText("数据格式异常");
x = 0;
}
}
else if(x == 2){
field.setText("数据格式错误.....");
arrayList.clear();
x = 0;
}
else if(x == 3){
field.setText(result);
x = 3;
}
else if(x == 4){
result ="";
sb.delete(0,sb.length());
arrayList.clear();
x = 3;
}
else {
try{
arrayList.add(sb.toString());
arrayList = getResult(arrayList);
result = arrayList.get(0);
field.setText(result);
arrayList.clear();
x = 3;
}catch(Exception e1){
field.setText("数据格式异常");
x = 0;
}
}
}
else if("CLEAR".equals(str)){
arrayList.clear();
field.setText("0");
arrayList.add("0");
x = 4;
}
else{
if(result.length()1){
result = result.substring(0,result.length()-1);
if(sb.length()0){
sb.delete(sb.length()-1,sb.length());
}
else {
sb.delete(0,1);
}
field.setText(result);
x = 5;
}
else{
result = "";
sb.delete(0,sb.length());
arrayList.clear();
field.setText("0");
x = 0;
}
}
}
public static ArrayListString getResult(ArrayListString list){
String res = null;
String[] s = {"/","*","-","+"};
int i=0;
if(list.size()1){
for(;is.length;){
if(s[i].equals("/")){
for(int j=0;jlist.size();j++){
if(list.get(j).equals(s[i])){
res = Double.toString(Double.parseDouble(list.get(j-1))/Double.parseDouble(list.get(j+1)));
//本地的数据格式
NumberFormat nf = NumberFormat.getInstance();
res = nf.format(Double.parseDouble(res));
res = getChange(res);
list.set(j-1,res);
list.remove(j);
list.remove(j);
getResult(list);
}
}
i++;
}
else if(s[i].equals("*")){
for(int j=0;jlist.size();j++){
if(list.get(j).equals(s[i])){
res = Double.toString(Double.parseDouble(list.get(j-1))*Double.parseDouble(list.get(j+1)));
NumberFormat nf = NumberFormat.getInstance();
res = nf.format(Double.parseDouble(res));
res = getChange(res);
list.set(j-1,res);
list.remove(j);
list.remove(j);
getResult(list);
}
}
i++;
}
else if(s[i].equals("-")){
for(int j=0;jlist.size();j++){
if(list.get(j).equals(s[i])){
res = Double.toString(Double.parseDouble(list.get(j-1))-Double.parseDouble(list.get(j+1)));
NumberFormat nf = NumberFormat.getNumberInstance();
res = nf.format(Double.parseDouble(res));
res = getChange(res);
list.set(j-1,res);
list.remove(j);
list.remove(j);
getResult(list);
}
}
i++;
}
else {
for(int j=0;jlist.size();j++){
if(list.get(j).equals(s[i])){
res = Double.toString(Double.parseDouble(list.get(j-1))+Double.parseDouble(list.get(j+1)));
NumberFormat nf = NumberFormat.getInstance();
res = nf.format(Double.parseDouble(res));
res = getChange(res);
list.set(j-1,res);
list.remove(j);
list.remove(j);
getResult(list);
}
}
i++;
}
}
}
return list;
}
//对数字字符串进行排除不必要符号
public static String getChange(String res){
String s_temp = "";
char[] c = new char[res.length()];
for(int k=0;kc.length;k++){
c[k] = res.charAt(k);
}
for(int k=0;kc.length;k++){
if((c[k]= '0' c[k]= '9')|| c[k] == '.'){
s_temp += c[k];
}
}
return s_temp;
}
public static void main(String[] args){
new CalculatorA().showMi();
}
}
网页标题：java简便计算器代码 java编写一个简易计算器程序
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