求一个JAVA简单的计算器代码不要界面和按钮的那种

下面是一个简单的程序：import java.util.*;
public class calc {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.println("*****************简单计算器****************");
System.out.println("*\t\t\t\t\t*");
System.out.println("* 使用说明： 1.加法 2.减法 3.乘法 4.除法 * 5.退出");
System.out.println("*\t\t\t\t\t*");
System.out.println("*****************************************"); for(int i=0;i<100;i++){
System.out.print("\n请选择运算规则：");
int num = input.nextInt();
if (num == 5) {
break;
}
switch(num){
case 1:
System.out.println("\n******你选择了加法******\n");
System.out.print("请输入第1个加数:");
int jiashu1 = input.nextInt();
System.out.print("请输入第2个加数:");
int jiashu2 = input.nextInt();
System.out.println("运算结果为:" + jiashu1 + " + " + jiashu1 + " = " + (jiashu1 + jiashu2));
break;
case 2:
System.out.println("\n******你选择了减法******\n");
System.out.print("请输入被减数:");
int jianshu1 = input.nextInt();
System.out.print("请输入减数:");
int jianshu2 = input.nextInt();
System.out.println("运算结果为:" + jianshu1 + " - " + jianshu2 + " = " + (jianshu1 - jianshu2));
break;
case 3:
System.out.println("\n******你选择了乘法******\n");
System.out.print("请输入第1个因数:");
int chengfa1 = input.nextInt();
System.out.print("请输入第2个因数:");
int chengfa2 = input.nextInt();
System.out.println("运算结果为:" + chengfa1 + " * " + chengfa2 + " = " + (chengfa1 * chengfa2));
break;
case 4:
System.out.println("\n******你选择了除法******\n");
System.out.print("请输入被除数:");
double chufa1 = input.nextInt();
System.out.print("请输入除数:");
double chufa2 = input.nextInt();
System.out.println("运算结果为:" + chufa1 + " / " + chufa2 + " = " + (chufa1 / chufa2) + " 余 " + (chufa1 % chufa2));
break;
default:
System.out.println("\n你的选择有错，请重新选择!");
break;
}
}
}
}

输入一个合法的表达式，然后调用ScriptEngine来求值

package com.test;import java.awt.*;
import javax.swing.*;import java.awt.event.*;import javax.swing.border.*;public class Calculator1 extends JFrame implements ActionListener
{
private JFrame jf;
private JButton[] allButtons;
private JButton clearButton;
private JButton sinButton;
private JButton cosButton;
private JButton tanButton;
// private JButton cotButton;
private JTextField jtf;
private boolean isNew = true;
private String recentOperation = null;
private String recentNum = null;
public Calculator1()
{

/**
  * 设置窗口点击关闭按钮能关闭
  */
  jf=new JFrame("计算器1.0：JAVA");
  jf.addWindowListener(new WindowAdapter()
  {
   public void windowClosing(){
    System.exit(0);
   }
  });
  // 实例化所有的按钮以及编辑栏
  allButtons  = new JButton[16];
  clearButton = new JButton("DEL");
  sinButton   = new JButton("sin");
  cosButton   = new JButton("cos");
  tanButton   = new JButton("tan");
  jtf=new JTextField(25);
  jtf.setEditable(false);
//  jtf.setHorizontalAlignment(alignment)
  //给CanterPanel中的按钮添加标识符
  String str="123+456-789*0.=/";
  for(int i=0;i<allButtons.length;i++)
  {
   allButtons[i]=new JButton(str.substring(i,i+1));
}
}
public void init(){
  //设置布局
  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 GridLayout(1,4));

  northPanel.add(jtf);
  for(int i=0;i<16;i++){
   centerPanel.add(allButtons[i]);
  }
  southPanel.add(sinButton);
  southPanel.add(cosButton);
  southPanel.add(tanButton);
  //southPanel.add(cotButton);
  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;i<allButtons.length;i++)
{
  allButtons[i].addActionListener(this);
}
/**
  * 给DEL注册
  */
  clearButton.addActionListener(new ActionListener()
  {
   public void actionPerformed(ActionEvent e)
{
// TODO Auto-generated method stub
Calculator1.this.jtf.setText("");
}
   });

  /***
   * 实现sin,cos,tan 以及 allButton事件驱动按钮
   */
  sinButton.addActionListener(new ActionListener()
  {
  public void actionPerformed(ActionEvent e)
  {

double temp = Math.sin(Double.parseDouble(jtf.getText()));
  jtf.setText(String.valueOf(temp));
  return;
  }
  });
  cosButton.addActionListener(new ActionListener()
  {
  public void actionPerformed(ActionEvent e)
  {

double temp = Math.cos(Double.parseDouble(jtf.getText()));
  jtf.setText(String.valueOf(temp));
  return;
  }
  });
  tanButton.addActionListener(new ActionListener()
  {
  public void actionPerformed(ActionEvent e)
  {

double temp = Math.tan(Double.parseDouble(jtf.getText()));
  jtf.setText(String.valueOf(temp));
  return;
  }
  });
  /*cotButton.addActionListener(new ActionListener()
  {
  public void actionPerformed(ActionEvent e)
  {

double temp =- Double.parseDouble(jtf.getText());
  jtf.setText(String.valueOf(temp));
  return;
  }
  });*/
}
//对输入数字的事件处理
public void actionPerformed(ActionEvent e)
  {
  String s= e.getActionCommand();
  if(s.charAt(0)>='0'&&s.charAt(0)<='9')
  {
  if(!isNew)
  jtf.setText(jtf.getText()+s);
  else
  jtf.setText(s);
  isNew = false;

  }
  /**
   * 对“.”的事件处理
   */
  else if (s.equals("."))
  {
  if(jtf.getText().indexOf(".")!=-1)
  return;
  if(!isNew &&jtf.getText()!="")
  jtf.setText(jtf.getText()+".");
  else
  jtf.setText("0.");
  isNew = false;

  }
  //对"="的事件处理
  else if(s.equals("="))
  {
equalaction(e);

  }
  else
  {
if((jtf.getText()).equals(""))
return;
if(recentOperation !=null)equalaction(e);
  recentOperation = s;
  recentNum = jtf.getText();
  isNew = true;

  }
}
/**
* 对运算符及计算过程的事件处理
* @param e
*/
private void equalaction(ActionEvent e) {
// TODO Auto-generated method stub
if(recentOperation == null|| recentNum==null||
jtf.getText().equals(""))
return;
double last = 0,now = 0;

try
{
last = Double.parseDouble(recentNum);
now = Double.parseDouble(jtf.getText());
}
catch(NumberFormatException en)

{
recentOperation = null;
recentNum = null;
jtf.setText("数据输入不合法");
System.out.println("数据输入不合法");
isNew = true;
return;

}
if(recentOperation.equals("+"))
{
last+=now;

}
if(recentOperation.equals("-"))
{
last-=now;

}
if(recentOperation.equals("*"))
{
last*=now;

}
if(recentOperation.equals("/"))
{
last/=now;

}
jtf.setText(""+last);
recentNum = jtf.getText();
recentOperation=null;
isNew = true;
  }


//对CenterPanel设置 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;i<16;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 Calculator1().showMe();
}
}
/***
* 下面是第二个程序
*
*
*//*************public class Calculator1 extends JFrame  implements ActionListener
{

private boolean isNew = true;
private String recentOperation = null;
private String recentNum = null;

private JPanel p1 = new JPanel();
private JPanel p2 = new JPanel();
private JTextField jtf = new JTextField();

private GridLayout gridLayout1 = new GridLayout() ;
private GridBagLayout gridBagLayout1 = new GridBagLayout();
private GridBagLayout gridBagLayout2 = new GridBagLayout();

public void addButton(Container c,String s)
{
JButton b =new JButton(s);
b.setFont(new  java.awt.Font("SansSerif",0,12));
b.setForeground(Color.BLUE);
b.setBorder(BorderFactory.createRaisedBevelBorder());
c.add(b);
b.addActionListener( this);

} @Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub

String s= e.getActionCommand();
  if(s.charAt(0)>='0'&&s.charAt(0)<='9')
  {
  if(!isNew)
  jtf.setText(jtf.getText()+s);
  else
  jtf.setText(s);
  isNew = false;

  }
  else if (s.equals("."))
  {
  if(jtf.getText().indexOf(".")!=-1)
  return;
  if(!isNew &&jtf.getText()!="")
  jtf.setText(jtf.getText()+".");
  else
  jtf.setText("0.");
  isNew = false;

  }
  else if(s.equals("="))
  {
equalaction(e);

  }
  else
  {
if((jtf.getText()).equals(""))
return;
if(recentOperation !=null)equalaction(e);
  recentOperation = s;
  recentNum = jtf.getText();
  isNew = true;

  }
} private void equalaction(ActionEvent e) {
// TODO Auto-generated method stub
if(recentOperation == null|| recentNum==null||
jtf.getText().equals(""))
return;
double last = 0,now = 0;

try
{
last = Double.parseDouble(recentNum);
now = Double.parseDouble(jtf.getText());
}
catch(NumberFormatException en)

{
recentOperation = null;
recentNum = null;
jtf.setText("数据输入不合法");
System.out.println("数据输入不合法");
isNew = true;
return;

}
if(recentOperation.equals("+"))
{
last+=now;

}
if(recentOperation.equals("-"))
{
last-=now;

package test6;import java.util.Scanner;public class Calculator {
    public static void main(String[] args){
     boolean flag = true;     while(flag == true){
     System.out.println("请输入任意两个数");
     Scanner sc1 = new Scanner(System.in);
     float a = sc1.nextFloat();
     float b = sc1.nextFloat();
     System.out.println("请输入选择：");
         System.out.println("1.加法");
         System.out.println("2.减法");
         System.out.println("3.乘法");
         System.out.println("4.除法");
         System.out.println("5.求余");
         System.out.println("0.退出");
     System.out.print("请输入你的选择：");
     Scanner sc = new Scanner(System.in);
     int select  = sc.nextInt();
     if((select < 0) || (select > 5)){
     System.out.println("输入错误，请重新输入");

     }
     switch(select){
     case 0: System.exit(0);
     case 1: Calculator.plus(a, b);
     break;
     case 2: Calculator.minus(a, b);
     break;
     case 3: Calculator.multiply(a, b);
     break;
     case 4: Calculator.divid(a, b);
     break;
     case 5: Calculator.remaind(a, b);
     break;
     default: break;
     }

     }

    }
    public static  void plus(float a, float b){
System.out.println("相加结果为：" + (a+b));
}
    public static void minus(float a, float b){
     System.out.println("相减结果为：" + (a-b));
    }
    public static void multiply(float a, float b){
     System.out.println("相乘结果为：" + (a*b));

    }
    public static void divid(float a, float b){
     System.out.println("相除结果为：" + (a/b));
    }
    public static void remaind(float a, float b){
     System.out.println("相除余数为:" + (a%b));
    }
}

import java.awt.BorderLayout;
import java.awt.EventQueue;import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import java.awt.GridLayout;
import javax.swing.JButton;
import javax.swing.JTextField;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
public class Cacuclator extends JFrame {
double x, y;
    int k;

private JPanel contentPane;
private JTextField textField; /**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Cacuclator frame = new Cacuclator();
frame.setResizable(false);
frame.setVisible(true);
frame.setTitle("计算器");
} catch (Exception e) {
e.printStackTrace();
}
}
});
} /**
* Create the frame.
*/
public Cacuclator() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 450, 300);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);

JPanel panel = new JPanel();
panel.setBounds(10, 62, 60, 190);
contentPane.add(panel);
panel.setLayout(new GridLayout(4, 0, 1, 0));

JButton btnNewButton = new JButton("New button");
panel.add(btnNewButton);

JButton btnNewButton_2 = new JButton("New button");
panel.add(btnNewButton_2);

JButton btnNewButton_1 = new JButton("New button");
panel.add(btnNewButton_1);

JButton 正负 = new JButton("+/-");
正负.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) { String s = new String();
s = textField.getText();
//s = s.replaceAll("\\D+", "");
StringBuffer k = new StringBuffer(s);
k.append("-");
String u = new String(k);
textField.setText(u);

}
});
panel.add(正负);

JPanel panel_1 = new JPanel();
panel_1.setBounds(73, 49, 351, 50);
contentPane.add(panel_1);
panel_1.setLayout(new GridLayout(1, 0, 3, 0));

JButton BLACKSPACE = new JButton("BLACKSPACE");
BLACKSPACE.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
}
});
panel_1.add(BLACKSPACE);

JButton MC = new JButton("MC");
MC.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
}
});
panel_1.add(MC);

JButton C = new JButton("C");
C.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
textField.setText("");
}
});
panel_1.add(C);

JPanel panel_2 = new JPanel();
panel_2.setBounds(80, 109, 344, 143);
contentPane.add(panel_2);
panel_2.setLayout(new GridLayout(4, 0, 4, 0));

JButton b7 = new JButton("7");
b7.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String s = new String();
s = textField.getText();
StringBuffer k = new StringBuffer(s);
k.append("7");
String u = new String(k);
textField.setText(u);
}
});
panel_2.add(b7);

JButton b8 = new JButton("8");
b8.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String s = new String();
s = textField.getText();
StringBuffer k = new StringBuffer(s);
k.append("8");
String u = new String(k);
textField.setText(u);
}
});
panel_2.add(b8);

JButton b9 = new JButton("9");
b9.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String s = new String();
s = textField.getText();
StringBuffer k = new StringBuffer(s);
k.append("9");
String u = new String(k);
textField.setText(u);
}
});
panel_2.add(b9);

JButton 加 = new JButton("+");
加.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String s = textField.getText();
    x=Double.parseDouble(s);
  if(s.contains("+")||s.contains("-")||s.contains("*")||s.contains("/")){
  StringBuffer m=new StringBuffer(s);
  m.delete(m.length()-1, m.length());
  } textField.setText("+");
k = 0;

}
});
panel_2.add(加);

JButton b4 = new JButton("4");
b4.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String s = new String();
s = textField.getText();
StringBuffer k = new StringBuffer(s);
k.append("4");
String u = new String(k);
textField.setText(u);

}
});
panel_2.add(b4);

JButton b5 = new JButton("5");
b5.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String s = new String();
s = textField.getText();
StringBuffer k = new StringBuffer(s);
k.append("5");
String u = new String(k);
textField.setText(u);
}
});
panel_2.add(b5);

JButton b6 = new JButton("6");
b6.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String s = new String();
s = textField.getText();
StringBuffer k = new StringBuffer(s);
k.append("6");
String u = new String(k);
textField.setText(u);
}
});
panel_2.add(b6);

JButton 减 = new JButton("-");
减.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String s = textField.getText();
    x=Double.parseDouble(s);
  if(s.contains("+")||s.contains("-")||s.contains("*")||s.contains("/")){
  StringBuffer m=new StringBuffer(s);
  m.delete(m.length()-1, m.length());
  } textField.setText("-");
k =1;
}
});
panel_2.add(减);

JButton b1 = new JButton("1");
b1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String s = new String();
s = textField.getText();
StringBuffer k = new StringBuffer(s);
k.append("1");
String u = new String(k);
textField.setText(u);
}
});
panel_2.add(b1);

JButton b2 = new JButton("2");
b2.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String s = new String();
s = textField.getText();
StringBuffer k = new StringBuffer(s);
k.append("2");
String u = new String(k);
textField.setText(u);
}
});
panel_2.add(b2);

JButton b3 = new JButton("3");
b3.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String s = new String();
s = textField.getText();
StringBuffer k = new StringBuffer(s);
k.append("3");
String u = new String(k);
textField.setText(u);
}
});
panel_2.add(b3);

JButton 乘 = new JButton("*");
乘.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String s = textField.getText();
    x=Double.parseDouble(s);
  if(s.contains("+")||s.contains("-")||s.contains("*")||s.contains("/")){
  StringBuffer m=new StringBuffer(s);
  m.delete(m.length()-1, m.length());
  } textField.setText("*");
k = 2;
}
});
panel_2.add(乘);

JButton b0 = new JButton("0");
b0.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String s = new String();
s = textField.getText();
StringBuffer k = new StringBuffer(s);
k.append("0");
String u = new String(k);
textField.setText(u);
}
});
panel_2.add(b0);

JButton 点 = new JButton(".");
点.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
}
});
panel_2.add(点);

JButton 等 = new JButton("=");
等.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
     String s = textField.getText();
     StringBuffer kBuffer=new StringBuffer(s);
     kBuffer.delete(0, 1);
     String uString =new String(kBuffer);
     y=Double.parseDouble(uString);
     if(k==0){
x = x + y;
     }
     if(k==1){
x = x-y;
        }
        if(k==2){
x = x*y;
    }
    if(k==3){
x = x/y;
    }
String w = String.valueOf(x);
textField.setText(w);
x = 0;
y = 0;
}
});
panel_2.add(等);

JButton 除 = new JButton("/");
除.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String s = textField.getText();
    x=Double.parseDouble(s);
  if(s.contains("+")||s.contains("-")||s.contains("*")||s.contains("/")){
  StringBuffer m=new StringBuffer(s);
  m.delete(m.length()-1, m.length());
  } textField.setText("/");
k = 3;
}
});
panel_2.add(除);

textField = new JTextField();
textField.setBounds(10, 0, 414, 50);
contentPane.add(textField);
textField.setColumns(10);
}
}

这个是控制台的，实现四则运算，没有进行异常判断。
import java.util.ArrayList;
import java.util.Stack;
import java.util.StringTokenizer;
import java.io.*;public class Main {
    public static void main(String []args)throws IOException{
        Stack<String> stack = new Stack<String>();
        ArrayList<String> list = new ArrayList<String>();
        BufferedReader buf = new BufferedReader(
                new InputStreamReader(System.in));
        String str = buf.readLine();
        while(!str.equals("0")){
            list.clear();
            stack.clear();
            StringTokenizer st = new StringTokenizer(str);
            while(st.hasMoreTokens()){
                String temp = st.nextToken();
                if(isOperation(temp)){
                    while(!stack.empty() && getPriority(temp)<=getPriority(stack.peek())){
                        list.add(stack.pop());
                    }
                    stack.push(temp);
                }else{
                    list.add(temp);
                }
            }
            while(!stack.empty()){
                list.add(stack.pop());
            }
            double num1 =0;
            double num2 = 0;
            for(int i=0;i<list.size();i++){
                if(isOperation(list.get(i))){
                    num2=Double.parseDouble(stack.pop());
                    num1=Double.parseDouble(stack.pop());
                    num1=cal(num1,num2,list.get(i));
                    stack.push(String.valueOf(num1));
                }else{
                    stack.push(list.get(i));
                }
            }
            System.out.println(String.format("%.2f",Double.valueOf(stack.pop())));
            str=buf.readLine();
        }
    }
    private static boolean isOperation(String op){
        if(op.equals("+") || op.equals("-")
                || op.equals("*") || op.equals("/")){
            return true;
        }
        return false;
    }
    private static int getPriority(String op){
        if(op.equals("+") || op.equals("-")){
            return 0;
        }else{
            return 1;
        }
    }
    private static double cal(double v1,double v2,String op){
        if(op.equals("+")){
            return v1+v2;
        }else if(op.equals("-")){
            return v1-v2;
        }else if(op.equals("*")){
            return v1*v2;
        }else{
            return v1/v2;
        }
    }
}

调试易

求一个JAVA简单的计算器代码不要界面和按钮的那种

解决方案 »

求一个JAVA简单的计算器代码 不要界面和按钮的那种

解决方案 »

求一个JAVA简单的计算器代码不要界面和按钮的那种