java计算器源代码网格 java 计算器代码
编写java application程序实现一个简易计算器
Java计算器 源代码:
创新互联是一家专业提供东西湖企业网站建设,专注与成都网站设计、成都网站建设、H5响应式网站、小程序制作等业务。10年已为东西湖众多企业、政府机构等服务。创新互联专业网站建设公司优惠进行中。
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
/**********************Java计算器 主类*********************/
public class SunnyCalculator implements ActionListener {
JFrame f;
JMenu mEdit;
JMenu mView;
JMenu mHelp;
JMenuItem mCopy;
JMenuItem mPaste;
JTextField tResult;
JButton bNumber;
JButton bOperator;
JButton bOther;
JButton bM;
boolean isDouble=false;//是否为实数
int opFlag=-1;
static double t1=0,t2=0,t3=0,result=0;
static int opflag1=-1,opflag2=-1,flag=0,resflag=1;
int preOp,currentOp=0;//标准位
double op1=0,op2=0;//操作数
double n3;
StringBuffer buf=new StringBuffer(20);
StringBuffer copyBoard=new StringBuffer(20);//剪贴板
StringBuffer memory=new StringBuffer(20);//M系列
StringBuffer str=new StringBuffer();
//Java计算器 构造器
public SunnyCalculator()
{
f = new JFrame("Sunny计算器_杨梅树的盔甲");
Container contentPane = f.getContentPane();
/**************************Java计算器 菜单的创建*****************************/
JMenuBar mBar = new JMenuBar();
mBar.setOpaque(true);
mEdit = new JMenu("编辑(E)");
mEdit.setMnemonic(KeyEvent.VK_E);
mCopy = new JMenuItem("复制(C)");
mEdit.add(mCopy);
mPaste = new JMenuItem("粘贴(P)");
mEdit.add(mPaste);
mView = new JMenu("查看(V)");
mView.setMnemonic(KeyEvent.VK_V);
mView.add(new JMenuItem("标准型"));
mView.add(new JMenuItem("科学型"));
mView.addSeparator();
mView.add(new JMenuItem("查看分组"));
mHelp = new JMenu("帮助(H)");
mHelp.setMnemonic(KeyEvent.VK_H);
mHelp.add(new JMenuItem("帮助主题"));
mHelp.addSeparator();
mHelp.add(new JMenuItem("关于计算器"));
mBar.add(mEdit);
mBar.add(mView);
mBar.add(mHelp);
f.setJMenuBar(mBar);
contentPane.setLayout(new BorderLayout());
JPanel pTop = new JPanel();
tResult = new JTextField("0.",26);
tResult.setHorizontalAlignment(JTextField.RIGHT);
tResult.setEditable(false);
pTop.add(tResult);
contentPane.add(pTop,BorderLayout.NORTH);
JPanel pBottom = new JPanel();
pBottom.setLayout(new BorderLayout());
JPanel pLeft = new JPanel();
pLeft.setLayout(new GridLayout(5,1,3,3));
bM = new JButton(" ");
bM.setEnabled(false);
pLeft.add(bM);
/*************************Java计算器 功能键定义***************************/
bOther = new JButton("MC");
bOther.addActionListener(this);
bOther.setForeground(Color.red);
bOther.setMargin(new Insets(3,2,3,2));
pLeft.add(bOther);
bOther = new JButton("MR");
bOther.addActionListener(this);
bOther.setForeground(Color.red);
bOther.setMargin(new Insets(3,2,3,2));
pLeft.add(bOther);
bOther = new JButton("MS");
bOther.addActionListener(this);
bOther.setForeground(Color.red);
bOther.setMargin(new Insets(3,2,3,2));
pLeft.add(bOther);
bOther = new JButton("M+");
bOther.addActionListener(this);
bOther.setForeground(Color.red);
bOther.setMargin(new Insets(3,2,3,2));
pLeft.add(bOther);
pBottom.add(pLeft,BorderLayout.WEST);
JPanel pRight = new JPanel();
pRight.setLayout(new BorderLayout());
JPanel pUp = new JPanel();
pUp.setLayout(new GridLayout(1,3,3,0));
bOther = new JButton("BackSpace");
bOther.addActionListener(this);
bOther.setForeground(Color.red);
bOther.setMargin(new Insets(3,0,3,5));
pUp.add(bOther);
bOther = new JButton("CE");
bOther.addActionListener(this);
bOther.setForeground(Color.red);
pUp.add(bOther);
bOther = new JButton("C");
bOther.addActionListener(this);
bOther.setForeground(Color.red);
pUp.add(bOther);
/***************************Java计算器 数字键盘区定义**************************/
JPanel pDown = new JPanel();
pDown.setLayout(new GridLayout(4,5,3,2));
bNumber = new JButton("7");
bNumber.setForeground(Color.blue);
bNumber.addActionListener(this);
bNumber.setMargin(new Insets(3,3,3,3));
pDown.add(bNumber);
bNumber = new JButton("8");
bNumber.setForeground(Color.blue);
bNumber.addActionListener(this);
bNumber.setMargin(new Insets(3,3,3,3));
pDown.add(bNumber);
bNumber = new JButton("9");
bNumber.setForeground(Color.blue);
bNumber.addActionListener(this);
bNumber.setMargin(new Insets(3,3,3,3));
pDown.add(bNumber);
bOperator = new JButton("/");
bOperator.setForeground(Color.red);
bOperator.addActionListener(this);
bOperator.setMargin(new Insets(3,0,3,0));
pDown.add(bOperator);
bOperator = new JButton("sqrt");
bOperator.addActionListener(this);
bOperator.setForeground(Color.red);
bOperator.setMargin(new Insets(3,0,3,0));
pDown.add(bOperator);
bNumber = new JButton("4");
bNumber.setForeground(Color.blue);
bNumber.addActionListener(this);
bNumber.setMargin(new Insets(3,3,3,3));
bNumber.setHorizontalTextPosition(JButton.LEFT);
pDown.add(bNumber);
bNumber = new JButton("5");
bNumber.setForeground(Color.blue);
bNumber.addActionListener(this);
bNumber.setMargin(new Insets(3,3,3,3));
pDown.add(bNumber);
bNumber = new JButton("6");
bNumber.setForeground(Color.blue);
bNumber.addActionListener(this);
bNumber.setMargin(new Insets(3,3,3,3));
pDown.add(bNumber);
bOperator = new JButton("*");
bOperator.setForeground(Color.red);
bOperator.addActionListener(this);
bOperator.setMargin(new Insets(3,3,3,3));
pDown.add(bOperator);
bOperator = new JButton("%");
bOperator.setForeground(Color.blue);
bOperator.addActionListener(this);
bOperator.setMargin(new Insets(3,3,3,3));
pDown.add(bOperator);
bNumber = new JButton("1");
bNumber.setForeground(Color.blue);
bNumber.addActionListener(this);
bNumber.setMargin(new Insets(3,3,3,3));
pDown.add(bNumber);
bNumber = new JButton("2");
bNumber.setForeground(Color.blue);
bNumber.addActionListener(this);
bNumber.setMargin(new Insets(3,3,3,3));
pDown.add(bNumber);
bNumber = new JButton("3");
bNumber.setForeground(Color.blue);
bNumber.addActionListener(this);
bNumber.setMargin(new Insets(3,3,3,3));
pDown.add(bNumber);
bOperator = new JButton("-");
bOperator.setForeground(Color.red);
bOperator.addActionListener(this);
bOperator.setMargin(new Insets(3,3,3,3));
pDown.add(bOperator);
bOperator = new JButton("1/x");
bOperator.setForeground(Color.blue);
bOperator.addActionListener(this);
pDown.add(bOperator);
bNumber = new JButton("0");
bNumber.setForeground(Color.blue);
bNumber.addActionListener(this);
bNumber.setMargin(new Insets(3,3,3,3));
pDown.add(bNumber);
bOperator = new JButton("+/-");
bOperator.setForeground(Color.blue);
bOperator.addActionListener(this);
bOperator.setMargin(new Insets(3,3,3,3));
pDown.add(bOperator);
bOperator = new JButton(".");
bOperator.setForeground(Color.blue);
bOperator.addActionListener(this);
bOperator.setMargin(new Insets(3,3,3,3));
pDown.add(bOperator);
bOperator = new JButton("+");
bOperator.setForeground(Color.blue);
bOperator.addActionListener(this);
bOperator.setMargin(new Insets(3,3,3,3));
pDown.add(bOperator);
bOperator = new JButton("=");
bOperator.setForeground(Color.blue);
bOperator.addActionListener(this);
bOperator.setMargin(new Insets(3,3,3,3));
pDown.add(bOperator);
pRight.add(pUp,BorderLayout.NORTH);
pRight.add(pDown,BorderLayout.SOUTH);
pBottom.add(pRight,BorderLayout.EAST);
contentPane.add(pBottom,BorderLayout.SOUTH);
f.setSize(new Dimension(320,256));
f.setResizable(false);
f.setVisible(true);
f.addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
}
);
}
/************************Java计算器 计算方法区***************************/
public void actionPerformed(ActionEvent e)
{
String s = e.getActionCommand();
if(s.equals("复制(C)"))
{
String temp = tResult.getText().trim();
copyBoard.replace(0, copyBoard.length(), temp);
mPaste.setEnabled(true);
}
else if(s.equals("粘贴(p)"))
{
tResult.setText(copyBoard.toString());
}
else if(s.equals("CE"))
{
//如果是CE则清除文本框
tResult.setText("0.");
}
else if(s.equals("BackSpace"))
{
if(!tResult.getText().trim().equals("0."))
{
//如果文本框中有内容
if(str.length()!=1 str.length()!=0)
{
tResult.setText(str.delete(str.length()-1,str.length()).toString());
}
else
{
tResult.setText("0.");
str.setLength(0);
}
}
op2 = Double.parseDouble(tResult.getText().trim());
}
else if(s.equals("C"))
{
//如果是C删除当前计算
tResult.setText("0.");
op1 = op2 = 0;
str.replace(0, str.length(), " ");
preOp = currentOp = 0;
}
else if(s.equals("MC"))
{
//如果是MC则清除缓冲区
String temp = "";
memory.replace(0, memory.length(), temp);
bM.setText(" ");
}
else if(s.equals("MR"))
{
//如果按键为MR则恢复缓冲区的数到文本框
tResult.setText(memory.toString());
}
else if(s.equals("MS"))
{
//如果按键为MS则将文本框的数存入缓冲区
String s1 = tResult.getText().trim();
memory.replace(0, memory.length(), s1);
bM.setText("M");
}
else if(s.equals("M+"))
{
//如果按键为MS则将文本框值与缓冲区的数相加但不显示结果
String temp1 = tResult.getText().trim();
double dtemp = Double.parseDouble(temp1);
String temp2 = memory.toString();
dtemp += Double.parseDouble(temp2);
temp1 = String.valueOf(dtemp);
memory.replace(0, memory.length(), temp1);
}
else if(s.equals("1/x"))
{
//如果按键为1/x则将文本框中的数据为它的倒数
String temp = tResult.getText().trim();
double dtemp = Double.parseDouble(temp);
tResult.setText(""+1/dtemp);
}
else if(s.equals("sqrt"))
{
//如果按键为sqrt则将文本框中的内容求平方根
String temp = tResult.getText().trim();
double dtemp = Double.parseDouble(temp);
tResult.setText(""+Math.sqrt(dtemp));
}
else if(s.equals("+"))
{
str.setLength(0);
if(currentOp==0)
{
preOp = currentOp = 1;
op2 = 0;
tResult.setText(""+op1);
}
else
{
currentOp = preOp;
preOp = 1;
switch(currentOp){
case 1:
op1 += op2;
tResult.setText(""+op1);
break;
case 2:
op1 -= op2;
tResult.setText(""+op1);
break;
case 3:
op1 *= op2;
tResult.setText(""+op1);
break;
case 4:
op1 /= op2;
tResult.setText(""+op1);
break;
}
}
}
else if(s.equals("-")){
str.setLength(0);
if(currentOp==0)
{
preOp=currentOp=2;//op1=op2;op2=0;
tResult.setText(""+op1);
}
else
{
currentOp =preOp;
preOp =2;
switch(currentOp){
case 1:op1=op1+op2;tResult.setText(""+op1);break;
case 2:op1=op1-op2;tResult.setText(""+op1);break;
case 3:op1=op1*op2;tResult.setText(""+op1);break;
case 4:op1=op1/op2;tResult.setText(""+op1);break;
}
}
}
else if(s.equals("*"))//*
{
str.setLength(0);
if(currentOp==0)
{
preOp=currentOp=3;//op1=op2;op2=1;
tResult.setText(""+op1);//op1=op2;
}
else
{
currentOp =preOp;
preOp =3;
switch(currentOp){
case 1:op1=op1+op2;tResult.setText(""+op1);break;
case 2:op1=op1-op2;tResult.setText(""+op1);break;
case 3:op1=op1*op2;tResult.setText(""+op1);break;
case 4:op1=op1/op2;tResult.setText(""+op1);break;
}
}
}
else if(s.equals("/"))// /
{
str.setLength(0);
if(currentOp==0)
{
preOp=currentOp=4;//op2=1;
tResult.setText(""+op1);//op1=op2;
}
else
{
currentOp =preOp;
preOp =4;
switch(currentOp){
case 1:op1=op1+op2;tResult.setText(""+op1);break;
case 2:op1=op1-op2;tResult.setText(""+op1);break;
case 3:op1=op1*op2;tResult.setText(""+op1);break;
case 4:op1=op1/op2;tResult.setText(""+op1);break;
}
}
}
else if(s.equals("="))// =
{
if(currentOp==0)
{
str.setLength(0);
tResult.setText(""+op2);
}
else
{
str.setLength(0);
currentOp =preOp;
switch(currentOp){
case 1:op1=op1+op2;tResult.setText(""+op1);break;
case 2:op1=op1-op2;tResult.setText(""+op1);break;
case 3:op1=op1*op2;tResult.setText("qu
计算器源代码
import java.awt.BorderLayout;
import java.awt.Color;
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.JPanel;
import javax.swing.JTextField;
/**
* 一个计算器,与Windows附件自带计算器的标准版功能、界面相仿。
* 但还不支持键盘操作。
*/
public class Calculator extends JFrame implements ActionListener {
/** 计算器上的键的显示名字 */
private final String[] KEYS = { "7", "8", "9", "/", "sqrt", "4", "5", "6",
"*", "%", "1", "2", "3", "-", "1/x", "0", "+/-", ".", "+", "=" };
/** 计算器上的功能键的显示名字 */
private final String[] COMMAND = { "Backspace", "CE", "C" };
/** 计算器左边的M的显示名字 */
private final String[] M = { " ", "MC", "MR", "MS", "M+" };
/** 计算器上键的按钮 */
private JButton keys[] = new JButton[KEYS.length];
/** 计算器上的功能键的按钮 */
private JButton commands[] = new JButton[COMMAND.length];
/** 计算器左边的M的按钮 */
private JButton m[] = new JButton[M.length];
/** 计算结果文本框 */
private JTextField resultText = new JTextField("0");
// 标志用户按的是否是整个表达式的第一个数字,或者是运算符后的第一个数字
private boolean firstDigit = true;
// 计算的中间结果。
private double resultNum = 0.0;
// 当前运算的运算符
private String operator = "=";
// 操作是否合法
private boolean operateValidFlag = true;
/**
* 构造函数
*/
public Calculator(){
super();
//初始化计算器
init();
//设置计算器的背景颜色
this.setBackground(Color.LIGHT_GRAY);
this.setTitle("计算器");
//在屏幕(500, 300)坐标处显示计算器
this.setLocation(500, 300);
//不许修改计算器的大小
this.setResizable(false);
//使计算器中各组件大小合适
this.pack();
}
/**
* 初始化计算器
*/
private void init() {
// 文本框中的内容采用右对齐方式
resultText.setHorizontalAlignment(JTextField.RIGHT);
// 不允许修改结果文本框
resultText.setEditable(false);
// 设置文本框背景颜色为白色
resultText.setBackground(Color.WHITE);
//初始化计算器上键的按钮,将键放在一个画板内
JPanel calckeysPanel = new JPanel();
//用网格布局器,4行,5列的网格,网格之间的水平方向间隔为3个象素,垂直方向间隔为3个象素
calckeysPanel.setLayout(new GridLayout(4, 5, 3, 3));
for (int i = 0; i KEYS.length; i++) {
keys[i] = new JButton(KEYS[i]);
calckeysPanel.add(keys[i]);
keys[i].setForeground(Color.blue);
}
//运算符键用红色标示,其他键用蓝色表示
keys[3].setForeground(Color.red);
keys[8].setForeground(Color.red);
keys[13].setForeground(Color.red);
keys[18].setForeground(Color.red);
keys[19].setForeground(Color.red);
//初始化功能键,都用红色标示。将功能键放在一个画板内
JPanel commandsPanel = new JPanel();
//用网格布局器,1行,3列的网格,网格之间的水平方向间隔为3个象素,垂直方向间隔为3个象素
commandsPanel.setLayout(new GridLayout(1, 3, 3, 3));
for (int i = 0; i COMMAND.length; i++) {
commands[i] = new JButton(COMMAND[i]);
commandsPanel.add(commands[i]);
commands[i].setForeground(Color.red);
}
//初始化M键,用红色标示,将M键放在一个画板内
JPanel calmsPanel = new JPanel();
//用网格布局管理器,5行,1列的网格,网格之间的水平方向间隔为3个象素,垂直方向间隔为3个象素
calmsPanel.setLayout(new GridLayout(5, 1, 3, 3));
for (int i = 0; i M.length; i++) {
m[i] = new JButton(M[i]);
calmsPanel.add(m[i]);
m[i].setForeground(Color.red);
}
//下面进行计算器的整体布局,将calckeys和command画板放在计算器的中部,
//将文本框放在北部,将calms画板放在计算器的西部。
//新建一个大的画板,将上面建立的command和calckeys画板放在该画板内
JPanel panel1 = new JPanel();
//画板采用边界布局管理器,画板里组件之间的水平和垂直方向上间隔都为3象素
panel1.setLayout(new BorderLayout(3, 3));
panel1.add("North", commandsPanel);
panel1.add("Center", calckeysPanel);
//建立一个画板放文本框
JPanel top = new JPanel();
top.setLayout(new BorderLayout());
top.add("Center", resultText);
//整体布局
getContentPane().setLayout(new BorderLayout(3, 5));
getContentPane().add("North", top);
getContentPane().add("Center", panel1);
getContentPane().add("West", calmsPanel);
//为各按钮添加事件侦听器
//都使用同一个事件侦听器,即本对象。本类的声明中有implements ActionListener
for (int i = 0; i KEYS.length; i++) {
keys[i].addActionListener(this);
}
for (int i = 0; i COMMAND.length; i++) {
commands[i].addActionListener(this);
}
for (int i = 0; i M.length; i++) {
m[i].addActionListener(this);
}
}
/**
* 处理事件
*/
public void actionPerformed(ActionEvent e) {
//获取事件源的标签
String label = e.getActionCommand();
if (label.equals(COMMAND[0])){
//用户按了"Backspace"键
handleBackspace();
} else if (label.equals(COMMAND[1])) {
//用户按了"CE"键
resultText.setText("0");
} else if (label.equals(COMMAND[2])){
//用户按了"C"键
handleC();
} else if ("0123456789.".indexOf(label) = 0) {
//用户按了数字键或者小数点键
handleNumber(label);
// handlezero(zero);
} else {
//用户按了运算符键
handleOperator(label);
}
}
/**
* 处理Backspace键被按下的事件
*/
private void handleBackspace() {
String text = resultText.getText();
int i = text.length();
if (i 0) {
//退格,将文本最后一个字符去掉
text = text.substring(0, i - 1);
if (text.length() == 0) {
//如果文本没有了内容,则初始化计算器的各种值
resultText.setText("0");
firstDigit = true;
operator = "=";
} else {
//显示新的文本
resultText.setText(text);
}
}
}
/**
* 处理数字键被按下的事件
* @param key
*/
private void handleNumber(String key) {
if (firstDigit) {
//输入的第一个数字
resultText.setText(key);
} else if ((key.equals(".")) (resultText.getText().indexOf(".") 0)){
//输入的是小数点,并且之前没有小数点,则将小数点附在结果文本框的后面
resultText.setText(resultText.getText() + ".");
} else if (!key.equals(".")) {
//如果输入的不是小数点,则将数字附在结果文本框的后面
resultText.setText(resultText.getText() + key);
}
//以后输入的肯定不是第一个数字了
firstDigit = false;
}
/**
* 处理C键被按下的事件
*/
private void handleC() {
//初始化计算器的各种值
resultText.setText("0");
firstDigit = true;
operator = "=";
}
/**
* 处理运算符键被按下的事件
* @param key
*/
private void handleOperator(String key) {
if (operator.equals("/")) {
//除法运算
//如果当前结果文本框中的值等于0
if (getNumberFromText() == 0.0){
//操作不合法
operateValidFlag = false;
resultText.setText("除数不能为零");
} else {
resultNum /= getNumberFromText();
}
} else if (operator.equals("1/x")) {
//倒数运算
if (resultNum == 0.0){
//操作不合法
operateValidFlag = false;
resultText.setText("零没有倒数");
} else {
resultNum = 1 / resultNum;
}
} else if (operator.equals("+")){
//加法运算
resultNum += getNumberFromText();
} else if (operator.equals("-")){
//减法运算
resultNum -= getNumberFromText();
} else if (operator.equals("*")){
//乘法运算
resultNum *= getNumberFromText();
} else if (operator.equals("sqrt")) {
//平方根运算
resultNum = Math.sqrt(resultNum);
} else if (operator.equals("%")){
//百分号运算,除以100
resultNum = resultNum / 100;
} else if (operator.equals("+/-")){
//正数负数运算
resultNum = resultNum * (-1);
} else if (operator.equals("=")){
//赋值运算
resultNum = getNumberFromText();
}
if (operateValidFlag) {
//双精度浮点数的运算
long t1;
double t2;
t1 = (long) resultNum;
t2 = resultNum - t1;
if (t2 == 0) {
resultText.setText(String.valueOf(t1));
} else {
resultText.setText(String.valueOf(resultNum));
}
}
//运算符等于用户按的按钮
operator = key;
firstDigit = true;
operateValidFlag = true;
}
/**
* 从结果文本框中获取数字
* @return
*/
private double getNumberFromText() {
double result = 0;
try {
result = Double.valueOf(resultText.getText()).doubleValue();
} catch (NumberFormatException e){
}
return result;
}
public static void main(String args[]) {
Calculator calculator1 = new Calculator();
calculator1.setVisible(true);
calculator1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
求Java计算器标准的布局代码
是用awt和swing做的,很好看比单单用AWT做好看
import java.awt.*;
import javax.swing.*;
public class Conputer extends JFrame {
protected Container con = getContentPane();// 指向内容面板
protected JMenuBar a = new JMenuBar();// 菜单条
protected JMenu a1 = new JMenu("编辑(E)");// 菜单1
protected JMenu a2 = new JMenu("查看(V)");// 菜单2
protected JMenu a3 = new JMenu("帮助(H)");// 菜单3
protected JMenuItem a11 = new JMenuItem("复制(C)", 'C');// 菜单1的菜单项
protected JMenuItem a12 = new JMenuItem("粘贴(P)", 'P');// 菜单1的菜单项
protected JMenuItem a21 = new JMenuItem("标准型(T)", 'T');// 菜单2的菜单项
protected JMenuItem a22 = new JMenuItem("科学型(S)", 'S');// 菜单2的菜单项
protected JMenuItem a31 = new JMenuItem("帮助主题(H)", 'H');// 菜单3的菜单项
protected JTextField jtf = new JTextField(30);// 文本框
protected JButton[] jb = new JButton[27];
protected String[] arr = { "Backspace", "CE", "C", "MC", "7", "8", "9", "/", "sqrt",
"MR", "4", "5", "6", "*", "%", "MS", "1", "2", "3", "-", "1/x",
"M+", "0", "+/-", ".", "+", "=" };
protected JPanel jp = new JPanel();// 主面板
protected JPanel m = new JPanel();// 次面板
protected JPanel m1 = new JPanel();// 次次面板
protected JPanel m2 = new JPanel();// 次次面板
protected JPanel m3 = new JPanel();// 次次面板
protected JPanel m4 = new JPanel();// 次次面板
protected JPanel m5 = new JPanel();// 次次面板
protected JPanel m6 = new JPanel();// 次次面板
protected GridLayout glo = new GridLayout(6, 1, 3, 3);// 主网格布局
protected GridLayout glo1 = new GridLayout(1, 3, 3, 3);// 次网格布局
protected GridLayout glo2 = new GridLayout(1, 6, 3, 3);// 次网格布局
protected Conputer(String s) {
super(s);
a1.setMnemonic('E');
a1.add(a11);
a1.add(a12);
a2.setMnemonic('V');
a2.add(a21);
a2.add(a22);
a3.setMnemonic('H');
a3.add(a31);
a.add(a1);
a.add(a2);
a.add(a3);
this.setJMenuBar(a);// 菜单条完成
for (int i = 0; i 27; i++) {
jb[i] = new JButton(arr[i]);
}
jp.setLayout(glo);
jp.add(m1);
m1.add(jtf);
jtf.setEditable(false); jtf.setText("0."); jtf.setForeground(Color.BLUE); jtf.setBackground(Color.WHITE);
jtf.setHorizontalAlignment(JTextField.RIGHT);//文本显示在右边
jp.add(m2);
m2.setLayout(glo1);
m2.add(jb[0]);
m2.add(jb[1]);
m2.add(jb[2]);
jp.add(m3);
m3.setLayout(glo2);
m3.add(jb[3]);
m3.add(jb[4]);
m3.add(jb[5]);
m3.add(jb[6]);
m3.add(jb[7]);
m3.add(jb[8]);
jp.add(m4);
m4.setLayout(glo2);
m4.add(jb[9]);
m4.add(jb[10]);
m4.add(jb[11]);
m4.add(jb[12]);
m4.add(jb[13]);
m4.add(jb[14]);
jp.add(m5);
m5.setLayout(glo2);
m5.add(jb[15]);
m5.add(jb[16]);
m5.add(jb[17]);
m5.add(jb[18]);
m5.add(jb[19]);
m5.add(jb[20]);
jp.add(m6);
m6.setLayout(glo2);
m6.add(jb[21]);
m6.add(jb[22]);
m6.add(jb[23]);
m6.add(jb[24]);
m6.add(jb[25]);
m6.add(jb[26]);
m.add(jp);
con.add(m);
this.setResizable(false);// 不能用鼠标拉伸窗体
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//可以关闭窗体
this.setSize(380, 275);
this.setVisible(true);
}
protected Conputer() {
this("计算器");
}
public static void main(String[] args) {
new Conputer("计算器");
}
}
怎么用JAVA编程编写一个计算器?
打开IED:打开自己java编程的软件,采用的是eclipse软件。
建立java工程。
编写类。
编写类的详细步骤
1.类的基本结构:
由于这里用到了界面,所以要进行窗口界面的编程,按钮事件的处理,和计算处理界面;
package MyCaculator;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class MyCaculator extends JFrame {
private int add=1,sub=2,mul=3,div=4;
private int op=0;
boolean ifOp;
private String output="0";
private Button[] jba=new Button[]{new Button("7"),new Button("8"),
new Button("9"),new Button("+"),
new Button("4"),new Button("5"),new Button("6"),new Button("-"),
new Button("1"),new Button("2"),new Button("3"),new Button("*"),
new Button("0"),new Button("."),new Button("="),new Button("/")};
private JPanel jpt=new JPanel();
private JPanel jpb=new JPanel();
private JTextField jtf=new JTextField("");
private MyCaculator(){
}
private void operate(String x){
}
public String add(String x){
return output;
}
public String subtract(String x){
return output;
}
public String multiply(String x){
return output;
}
public String divide(String x){
return output;
}
public String Equals(String x){
return output;
}
public void opClean(){
}
class setOperate_Act implements ActionListener{
public void actionPerformed(ActionEvent e) {
}
}
class setLabel_Act implements ActionListener{
public void actionPerformed(ActionEvent e) {
}
}
public static void main(String[] args) {
}
}
2.建立构造方法:
所谓构造方法就是,对自己的主类进行初始化,代码如下:
private MyCaculator(){
jpt.setLayout(new BorderLayout());
jpt.add(jtf);
this.add(jpt,BorderLayout.NORTH);
jpb.setLayout(new GridLayout(4,4));
for(int i=0;ijba.length;i++){
jpb.add(jba[i]);
if(i==3||i==7||i==11||i==15||i==14)
jba[i].addActionListener(new setOperate_Act());
else
jba[i].addActionListener(new setLabel_Act());
}
this.add(jpb,BorderLayout.CENTER);
this.setSize(250, 200);
this.setResizable(false);
this.setVisible(true);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
3.建立数据计算方法
这里的数据计算方法有6个,一个是主方法其他几个是加减乘除的处理方法,代码如下:
private void operate(String x){
double x1=Double.valueOf(x);
double y=Double.valueOf(output);
switch(op){
case 0:output=x;break;
case 1:output=String.valueOf(y+x1);break;
case 2:output =String.valueOf(y-x1);break;
case 3:output =String.valueOf(y*x1);break;
case 4:
if(x1!=0) output=String.valueOf(y/x1);
else output="不能为0";
break;
}
}
public String add(String x){
operate(x);
op=add;
return output;
}
public String subtract(String x){
operate(x);
op=sub;
return output;
}
public String multiply(String x){
operate(x);
op=mul;
return output;
}
public String divide(String x){
operate(x);
op=div;
return output;
}
public String Equals(String x){
operate(x);
op=0;
return output;
}
public void opClean(){
op=0;
output ="0";
}
4.事件处理方法
这里的时间处理方法,没有建立一个整体的方法,二是在为了便于处理的方法,将按钮事件分成两个部分,并采用两个子类来实现,这两个类时内部类要写在主类内部的,代码如下:
class setOperate_Act implements ActionListener{
public void actionPerformed(ActionEvent e) {
if(e.getSource()==jba[3]){
jtf.setText(add(jtf.getText()));
ifOp=true;
}
else if(e.getSource()==jba[7]){
jtf.setText(subtract(jtf.getText()));
ifOp=true;
}
else if(e.getSource()==jba[11]){
jtf.setText(multiply(jtf.getText()));
ifOp=true;
}
else if(e.getSource()==jba[15]){
jtf.setText(divide(jtf.getText()));
ifOp=true;
}
else if(e.getSource()==jba[14]){
jtf.setText(Equals(jtf.getText()));
ifOp=true;
}
}
}
class setLabel_Act implements ActionListener{
public void actionPerformed(ActionEvent e) {
Button tempb=(Button)e.getSource();
if(ifOp){
jtf.setText(tempb.getLabel());
ifOp=false;
}else {
jtf.setText(jtf.getText()+tempb.getLabel());
}
}
}
5.建立main方法:
要想实现我们的代码,我们需在main方法中,实例化我们的对象。
public static void main(String[] args) {
new MyCaculator();
}
分享题目:java计算器源代码网格 java 计算器代码
本文链接:http://myzitong.com/article/dogshoh.html