import java.util.Scanner;
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public class JiSuan {
public static void main(String[] args) {
String zhanghao="765800331";//注意账号密码均为字符串类型
String mima="123456";
int isgoing=0;//当账号或密码输入错误时提示是否继续输入
String select="";//六种运算中你的选择
int result=0;//运算结果
int a=0;
int b=0;
Scanner sa = new Scanner(System.in);
do{
System.out.println("请输入你的账号：");
String zhanghao1= sa.next();
System.out.println("请输入你的密码：");
String mima1= sa.next();
if(zhanghao.equals(zhanghao1)mima.equals(mima1)){
while(zhanghao.equals(zhanghao1)mima.equals(mima1)){
System.out.println("*******************欢迎使用Java小计算器**************");
System.out.println("本计算器提供以下功能");
System.out.println("A.加法");
System.out.println("B.减法");
System.out.println("C.乘法");
System.out.println("D.除法");
System.out.println("E.a的b次幂");
System.out.println("F.退出计算器");
System.out.println("请选择：");
select= sa.next();
char c=select.charAt(0);//申明一个变量c来接收select转换成char类型的变量
switch(c){
case 'A':
System.out.println("请输入第一个数");
a = sa.nextInt();
System.out.println("请输入第二个数");
b = sa.nextInt();
result = a+b;
System.out.println("运算结果如下："+result);
break;
case 'B':
System.out.println("请输入第一个数");
a = sa.nextInt();
System.out.println("请输入第二个数");
b = sa.nextInt();
result = a-b;
System.out.println("运算结果如下："+result);
break;
case 'C':
System.out.println("请输入第一个数");
a = sa.nextInt();
System.out.println("请输入第二个数");
b = sa.nextInt();
result = a*b;
System.out.println("运算结果如下："+result);
break;
case 'D':
System.out.println("请输入第一个数");
a = sa.nextInt();
System.out.println("请输入第二个数");
b = sa.nextInt();
result = a/b;
if(a%b!=0){
int m=a%b;
System.out.println("运算结果如下："+result+" 余数："+m);
}else{
System.out.println("运算结果如下："+result);
}
break;
case 'E':
System.out.println("请输入第一个数");
a = sa.nextInt();
System.out.println("请输入第二个数");
b = sa.nextInt();
int i=0;//指数的底数
int sum=1;//用来接收a的b次幂的结果
for(i=0;ib;i++){
sum=sum*a;
result=sum;
}
System.out.println("运算结果如下："+result);
break;
case 'F':
System.out.println("退出计算器");
break;
default:
System.out.println("无效输入");
break;
}
if(c=='F'){
break;
}
}
}else{
System.out.println("账号或密码输入错误！");
System.out.println("是否继续输入？（1.是0.否）");
isgoing = sa.nextInt();
}
}while(isgoing==1);
}
}
界面漂亮堪比系统自带计算器，功能完美加减乘除开平方等等全部具备，还有清零按钮，小数点的使用，连加连乘功能完全参考系统官方计算器经过长期调试改进而成，马上拷贝代码拿去试试看吧，绝不后悔！
代码如下：
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
public class Counter {
public static void main(String[] args) {
CounterFrame frame = new CounterFrame();
frame.show();
}
}
class CounterFrame extends JFrame {
public CounterFrame() {
JMenuBar menuBar = new JMenuBar();
JMenu menuFile = new JMenu();
JMenu menuFile1 = new JMenu();
JMenu menuFile2 = new JMenu();
JMenu menuFile3 = new JMenu();
JMenuItem menuFileExit = new JMenuItem();
menuFile.setText("文件");
menuFile1.setText("编辑");
menuFile2.setText("查看");
menuFile3.setText("帮助");
menuFileExit.setText("退出");
menuFileExit.addActionListener
(
new ActionListener() {
public void actionPerformed(ActionEvent e) {
CounterFrame.this.windowClosed();
}
}
);
menuFile.add(menuFileExit);
menuBar.add(menuFile);
menuBar.add(menuFile1);
menuBar.add(menuFile2);
menuBar.add(menuFile3);
setTitle("计算器");
setJMenuBar(menuBar);
setSize(new Dimension(400, 280));
this.getContentPane().add(new Allpanel());
this.addWindowListener
(
new WindowAdapter() {
public void windowClosing(WindowEvent e) {
CounterFrame.this.windowClosed();
}
}
);
}
protected void windowClosed() {
System.exit(0);
}
}
class Tool {
public static Tool instance;
private JTextField field;
private Tool() {
this.field=new JTextField(30);
this.field.setHorizontalAlignment(JTextField.RIGHT);
}
public static Tool getinstance()
{
if(instance==null)
{
instance=new Tool();
}
return instance;
}
public JTextField getfield()
{
return (this.field);
}
}
class Allpanel extends JPanel {
public Allpanel() {
this.setLayout(new BorderLayout(0,7));
Northpanel np=new Northpanel();
Centerpanel cp=new Centerpanel();
this.add(np,BorderLayout.NORTH);
this.add(cp,BorderLayout.CENTER);
}
}
class Centercenter extends JPanel {
static Vector Vec=new Vector();
static Vector vc=new Vector();
static Vector vc1=new Vector();
static Vector vc2=new Vector();
static Vector vc3=new Vector();
static String begin="yes";
static double add;
static double jq;
static double cs;
static double cq;
static double dy;
static String jg;
static String what;
static double tool=0;
static String to="yes";
/**
* Method Centercenter
*
*
*/
public Centercenter() {
// TODO: Add your code here
final JTextField text=Tool.getinstance().getfield();
this.setLayout(new GridLayout(4,5,3,3));
String arg[] ={"7","8","9","/","sqrt","4","5","6","*","%","1","2","3","-","1/x","0","+/-",".","+","="};
for(int i=0;i20;i++)
{
final JButton b=new JButton(arg[i]);
//this.add(new JButton(arg[i]));
this.add(b);
if(i==0||i==1||i==2||i==5||i==6||i==7||i==10||i==11||i==12||i==15)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String mark=b.getText();
String ma=text.getText();
if(vc3.contains("v3"))
{
text.setText("0."+mark);
vc3.clear();
}
else if(vc.contains("a"))
{
if(vc2.contains("v2"))
{
text.setText("0."+mark);
vc.clear();
vc2.clear();
}
else
{
text.setText(mark);
vc.clear();
Vec.clear();
Vec.add(mark);
}
}
else
{
text.setText(ma.trim()+mark);
Vec.add(mark);
}
begin="no";
to="yes";
}
});
}
if(i==17)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String mar=b.getText();
String m=text.getText();
if("yes".equals(begin))
{
vc3.add("v3");
}
if(vc1.contains("v1"))
{
vc2.add("v2");
vc1.clear();
}
if(!Vec.contains(".")!vc.contains("a"))
{
text.setText(m.trim()+mar);
Vec.add(".");
}
}
});
}
if(i==18)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String ma=text.getText();
add=Double.parseDouble(ma);
if(what==null)
{
tool=add;
what="add";
}
else
{
tool=tool+add;
text.setText(String.valueOf((tool)));
}
vc.add("a");
vc1.add("v1");
to="+";
}
});
}
if(i==13)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String ma=text.getText();
jq=Double.parseDouble(ma);
if(what==null)
{
tool=jq;
what="jq";
}
else
{
tool=tool-jq;
text.setText(String.valueOf((tool)));
}
vc.add("a");
vc1.add("v1");
to="-";
}
});
}
if(i==3)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String ma=text.getText();
cq=Double.parseDouble(ma);
if(what==null)
{
tool=cq;
what="cq";
}
else
{
tool=tool/cq;
text.setText(String.valueOf((tool)));
}
vc.add("a");
vc1.add("v1");
to="/";
}
});
}
if(i==4)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String ma=text.getText();
cq=Double.parseDouble(ma);
text.setText(String.valueOf(Math.sqrt(cq)));
}
});
}
if(i==8)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String ma=text.getText();
cs=Double.parseDouble(ma);
if(what==null)
{
tool=cs;
what="cs";
}
else
{
tool=tool*cs;
text.setText(String.valueOf((tool)));
}
vc.add("a");
vc1.add("v1");
to="*";
}
});
}
if(i==19)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String ma=text.getText();
dy=Double.parseDouble(ma);
if(what=="add")
{
jg=String.valueOf((tool+dy));
}
if(what=="jq")
{
jg=String.valueOf((tool-dy));
}
if(what=="cs")
{
jg=String.valueOf((tool*dy));
}
if(what=="cq")
{
jg=String.valueOf((tool/dy));
}
if(what==null)
{
if(to=="+")
{
tool=add;
jg=String.valueOf(tool+dy);
}
else if(to=="-")
{
tool=jq;
jg=String.valueOf(dy-tool);
}
else if(to=="*")
{
tool=cs;
jg=String.valueOf(dy*tool);
}
else if(to=="/")
{
tool=cq;
jg=String.valueOf(dy/tool);
}
else
{
jg=String.valueOf(dy);
}
}
text.setText(jg);
Vec.clear();
Vec.add(".");
vc.add("a");
vc1.add("v1");
what=null;
tool=0;
}
});
}
}
}
}
class Centernorth extends JPanel {
public Centernorth() {
final JTextField text=Tool.getinstance().getfield();
JButton jb1=new JButton("Backspace");
JButton jb2=new JButton(" CE ");
JButton jb3=new JButton(" C ");
this.add(jb1);
this.add(jb2);
this.add(jb3);
jb1.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
String back=Tool.getinstance().getfield().getText();
text.setText(backmethod(back));
Centercenter.Vec.remove(Centercenter.Vec.size()-1);
}
});
jb3.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e)
{
text.setText("0.");
Centercenter.Vec.clear();
Centercenter.Vec.add(".");
Centercenter.vc.add("a");
Centercenter.begin="yes";
Centercenter.vc1.clear();
Centercenter.what=null;
Centercenter.tool=0;
}
});
}
public String backmethod(String str)
{
return str.substring(0,str.length()-1);
}
}
class Centerpanel extends JPanel {
public Centerpanel() {
this.setLayout(new BorderLayout(8,7));
Centernorth cn=new Centernorth();
Centercenter cc=new Centercenter();
Centerwest cw=new Centerwest();
this.add(cn,BorderLayout.NORTH);
this.add(cc,BorderLayout.CENTER);
this.add(cw,BorderLayout.WEST);
}
}
class Centerwest extends JPanel {
public Centerwest() {
this.setLayout(new GridLayout(4,1,3,3));
this.add(new JButton("MC"));
this.add(new JButton("MR"));
this.add(new JButton("MS"));
this.add(new JButton("M+"));
}
}
class Northpanel extends JPanel {
private JTextField tf;
public Northpanel() {
tf=Tool.getinstance().getfield();
this.add(tf);
}
}
---------------------------------------------------------------------------
=============《按你要求特意后改过的最简单功能的代码如下》========================
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
public class Counter2 {
public static void main(String[] args) {
CounterFrame frame = new CounterFrame();
frame.show();
}
}
class CounterFrame extends JFrame {
public CounterFrame() {
setTitle("计算器");
setSize(new Dimension(400, 280));
this.getContentPane().add(new Allpanel());
this.addWindowListener
(
new WindowAdapter() {
public void windowClosing(WindowEvent e) {
CounterFrame.this.windowClosed();
}
}
);
}
protected void windowClosed() {
System.exit(0);
}
}
class Tool {
public static Tool instance;
private JTextField field;
private Tool() {
this.field=new JTextField(30);
this.field.setHorizontalAlignment(JTextField.RIGHT);
}
public static Tool getinstance()
{
if(instance==null)
{
instance=new Tool();
}
return instance;
}
public JTextField getfield()
{
return (this.field);
}
}
class Allpanel extends JPanel {
public Allpanel() {
this.setLayout(new BorderLayout(0,7));
Northpanel np=new Northpanel();
Centerpanel cp=new Centerpanel();
this.add(np,BorderLayout.NORTH);
this.add(cp,BorderLayout.CENTER);
}
}
class Centercenter extends JPanel {
static Vector Vec=new Vector();
static Vector vc=new Vector();
static Vector vc1=new Vector();
static Vector vc2=new Vector();
static Vector vc3=new Vector();
static String begin="yes";
static double add;
static double jq;
static double cs;
static double cq;
static double dy;
static String jg;
static String what;
static double tool=0;
static String to="yes";
/**
* Method Centercenter
*
*
*/
public Centercenter() {
// TODO: Add your code here
final JTextField text=Tool.getinstance().getfield();
this.setLayout(new GridLayout(4,5,3,3));
String arg[] ={"7","8","9","/","4","5","6","*","1","2","3","-","0","=",".","+"};
for(int i=0;i16;i++)
{
final JButton b=new JButton(arg[i]);
//this.add(new JButton(arg[i]));
this.add(b);
if(i==0||i==1||i==2||i==4||i==5||i==6||i==8||i==9||i==10||i==12)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String mark=b.getText();
String ma=text.getText();
if(vc3.contains("v3"))
{
text.setText("0."+mark);
vc3.clear();
}
else if(vc.contains("a"))
{
if(vc2.contains("v2"))
{
text.setText("0."+mark);
vc.clear();
vc2.clear();
}
else
{
text.setText(mark);
vc.clear();
Vec.clear();
Vec.add(mark);
}
}
else
{
text.setText(ma.trim()+mark);
Vec.add(mark);
}
begin="no";
to="yes";
}
});
}
if(i==14)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String mar=b.getText();
String m=text.getText();
if("yes".equals(begin))
{
vc3.add("v3");
}
if(vc1.contains("v1"))
{
vc2.add("v2");
vc1.clear();
}
if(!Vec.contains(".")!vc.contains("a"))
{
text.setText(m.trim()+mar);
Vec.add(".");
}
}
});
}
if(i==15)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String ma=text.getText();
add=Double.parseDouble(ma);
if(what==null)
{
tool=add;
what="add";
}
else
{
tool=tool+add;
text.setText(String.valueOf((tool)));
}
vc.add("a");
vc1.add("v1");
to="+";
}
});
}
if(i==11)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String ma=text.getText();
jq=Double.parseDouble(ma);
if(what==null)
{
tool=jq;
what="jq";
}
else
{
tool=tool-jq;
text.setText(String.valueOf((tool)));
}
vc.add("a");
vc1.add("v1");
to="-";
}
});
}
if(i==3)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String ma=text.getText();
cq=Double.parseDouble(ma);
if(what==null)
{
tool=cq;
what="cq";
}
else
{
tool=tool/cq;
text.setText(String.valueOf((tool)));
}
vc.add("a");
vc1.add("v1");
to="/";
}
});
}
if(i==7)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String ma=text.getText();
cs=Double.parseDouble(ma);
if(what==null)
{
tool=cs;
what="cs";
}
else
{
tool=tool*cs;
text.setText(String.valueOf((tool)));
}
vc.add("a");
vc1.add("v1");
to="*";
}
});
}
if(i==13)
{
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
String ma=text.getText();
dy=Double.parseDouble(ma);
if(what=="add")
{
jg=String.valueOf((tool+dy));
}
if(what=="jq")
{
jg=String.valueOf((tool-dy));
}
if(what=="cs")
{
jg=String.valueOf((tool*dy));
}
if(what=="cq")
{
jg=String.valueOf((tool/dy));
}
if(what==null)
{
if(to=="+")
{
tool=add;
jg=String.valueOf(tool+dy);
}
else if(to=="-")
{
tool=jq;
jg=String.valueOf(dy-tool);
}
else if(to=="*")
{
tool=cs;
jg=String.valueOf(dy*tool);
}
else if(to=="/")
{
tool=cq;
jg=String.valueOf(dy/tool);
}
else
{
jg=String.valueOf(dy);
}
}
text.setText(jg);
Vec.clear();
Vec.add(".");
vc.add("a");
vc1.add("v1");
what=null;
tool=0;
}
});
}
}
}
}
class Centernorth extends JPanel {
public Centernorth() {
final JTextField text=Tool.getinstance().getfield();
}
}
class Centerpanel extends JPanel {
public Centerpanel() {
this.setLayout(new BorderLayout(8,7));
Centernorth cn=new Centernorth();
Centercenter cc=new Centercenter();
Centerwest cw=new Centerwest();
this.add(cn,BorderLayout.NORTH);
this.add(cc,BorderLayout.CENTER);
this.add(cw,BorderLayout.WEST);
}
}
class Centerwest extends JPanel {
public Centerwest() {
}
}
class Northpanel extends JPanel {
private JTextField tf;
public Northpanel() {
tf=Tool.getinstance().getfield();
this.add(tf);
}
}
------------------------------------------------------------
才子_辉祝您愉快！
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.Toolkit;
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.SwingUtilities;
import javax.swing.UIManager;
class CalculatorPanel extends JPanel {
private JPanel jp; // 中间的面板
private double result; // 计算结果
private boolean start; // 用于判断是否是首次输入,true首次,false不是首次
private boolean flag; // 用于判断是否清空显示区域的值,true需要,false不需要
private String lastCommand; // 用于保存运算符
JButton display; // 显示区域
public CalculatorPanel() {
// 初始化各项值
result = 0;
start = true;
flag = false;
lastCommand = "=";
// 设置CalculatorPanel这个面板的布局为框架布局
setLayout(new BorderLayout());
// 这个按钮用来显示值的区域
display = new JButton("0.0");
display.setEnabled(false);// 按钮样式设置为禁用样式
// 用来初始化,清除用的
JButton clear = new JButton("clear");
clear.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// 作初始化的操作
result = 0;
start = true;
flag = false;
lastCommand = "=";
display.setText("0.0");
}
});
jp = new JPanel();
// 将此面板布局设置为网格布局,4行4列
jp.setLayout(new GridLayout(4, 4));
// 实例化监听器对象
NumberAction na = new NumberAction();
CommandAction ca = new CommandAction();
makeButton("7", na);
makeButton("8", na);
makeButton("9", na);
makeButton("/", ca);
makeButton("4", na);
makeButton("5", na);
makeButton("6", na);
makeButton("*", ca);
makeButton("1", na);
makeButton("2", na);
makeButton("3", na);
makeButton("-", ca);
makeButton("0", na);
makeButton(".", na);
makeButton("+", ca);
makeButton("=", ca);
// 将面板,两个按键加入到我的面板,实现计算器的界面
add(display, BorderLayout.NORTH);
add(jp, BorderLayout.CENTER);
add(clear, BorderLayout.SOUTH);
}
private void makeButton(String buttonName, ActionListener al) {
JButton jb = new JButton(buttonName);
jp.add(jb);
jb.addActionListener(al);
}
// 数字监听器
private class NumberAction implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
JButton jb = (JButton) e.getSource(); // 获取事件源对象
String input = jb.getText(); // 获取事件源对象上的标签
if (start) { // 首次输入
// 一上就".",就什么也不做
if (input.equals(".")) {
return;
}
// 如果是"0.0"的话,就清空
if (display.getText().equals("0.0")) {
display.setText("");
}
start = false;// 改变是否首次输入的标记值
} else {
// 判断显示区域的值里面是否已经有".",如果有,输入的又是".",就什么都不做
if (display.getText().indexOf(".") != -1) {
if (input.equals(".")) {
return;
}
}
// 判断显示区域的值里面只有"-",输入的又是".",就什么都不做
if (display.getText().equals("-")) {
if (input.equals(".")) {
return;
}
}
// 判断显示区域的值如果是"0",输入的不是".",就什么也不做
if (display.getText().equals("0")) {
if (!input.equals(".")) {
return;
}
}
}
// 如果我点击了运算符以后,再输入数字的话,就要清空显示区域的值
if (flag) {
display.setText("");
flag = false;// 还原初始值,不需要清空
}
display.setText(display.getText() + input);// 设置显示区域的值
}
}
// 运算符监听器
private class CommandAction implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
JButton jb = (JButton) e.getSource(); // 获取事件源对象
String inputCommand = jb.getText(); // 获取事件源对象上的标签
if (start) {// 首次输入
// 一上就是"-"
if (inputCommand.equals("-")) {
display.setText("-");// 显示区域的内容设置为"-"
start = false;// 改变首次输入的标记
}
} else {
if (!flag) {// 如果flag=false不需要清空显示区的值,就调用方法计算
calculate(Double.parseDouble(display.getText()));// 保存显示区域的值,并计算
}
// 保存你点击的运算符
lastCommand = inputCommand;
flag = true;// 因为我这里已经输入过运算符,
}
}
}
// 计算用的方法
private void calculate(double x) {
if (lastCommand.equals("+")) {
result += x;
} else if (lastCommand.equals("-")) {
result -= x;
} else if (lastCommand.equals("*")) {
result *= x;
} else if (lastCommand.equals("/")) {
result /= x;
} else if (lastCommand.equals("=")) {
result = x;
}
display.setText("" + result);
}
}
class MyFrameUitl {
public static void init(JFrame jFrame, Dimension frameSize, String title,
String iconFileName, boolean resizable) {
Toolkit tk = Toolkit.getDefaultToolkit(); // 系统工具包,可以读取系统信息
Dimension screenSize = tk.getScreenSize();// 获取屏幕大小
// 获取宽高
int screenWidth = screenSize.width;
int screenHeight = screenSize.height;
// 找中心点
int centerX = screenWidth / 2;
int centerY = screenHeight / 2;
// 解析窗体大小
int frameWidth = frameSize.width;
int frameHeight = frameSize.height;
// 设置窗体位置
jFrame.setBounds(centerX - frameWidth / 2, centerY - frameHeight / 2,
frameWidth, frameHeight);
jFrame.setTitle(title);// 设置标题
if (iconFileName != null) {
jFrame.setIconImage(tk.getImage(iconFileName));// 设置图标
}
// 设置皮肤com.sun.java.swing.plaf.windows.WindowsLookAndFeel
/**/
try {
UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
SwingUtilities.updateComponentTreeUI(jFrame);
} catch (Exception e1) {
e1.printStackTrace();
}
jFrame.setResizable(resizable);// 设置窗体是否可以改变大小
jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // 设置程序关闭动作
jFrame.setVisible(true);// 显示窗体
}
}
class CalculatorFrame extends JFrame {
public CalculatorFrame() {
add(new CalculatorPanel());
MyFrameUitl.init(this, new Dimension(400, 300), "简易计算器", null,
false);
this.pack();// 让组件按原始大小显示,并且窗体的大小刚好能够容纳所有的组件
}
}
public class CalculatorTest {
public static void main(String[] args) {
new CalculatorFrame();
}
}
运行结果：