java实现简单计算器功能

使用java来实现一个简单的计算器，供大家参考，具体内容如下

最近使用java制作了一个计算器，菜单栏里的功能没有实现，只是写一个版式，仅仅实现了计算功能 ，如果想要实现菜单栏功能可自行在该代码的基础上去实现。

话不多说直接上代码

package test;

import javax.swing.*;
import java.awt.*;
import java.awt.event.actionevent;
import java.awt.event.actionlistener;

 public class calculate extends jframe implements actionlistener {
  private container ct;
  private jbutton[] jbs;
  private string[] str;
  private jtextfield jtextfield;
  //cal[0]用来存储第一次输入的数
  //cal[1]用来存储运算符（+，-，*，/，%）
  //cal[2]用来存储第二次输入的数
  //cal[3]用来存储结果
  //cal[4]用来存储ms键所存储的数
  //cal[5]用来获取要存入的值(用来给cal[4]赋值)
  private string[] cal = {"","","","","",""};
  //_count和_count1始终相反,如果_count为true则表示正在输入cal[0]反之表示cal[0]输入完成，该输入cal[2]
  //当点过等号后将cal[3]的值赋给cal[0]
  private boolean _count = true;
  private boolean _count1 = false;

  public calculate() {
   super("计算器");
   jbs = new jbutton[28];
   ct = this.getcontentpane();
   this.setbounds(100, 100, 315, 400);
   this.setdefaultcloseoperation(windowconstants.exit_on_close);
   ct.setlayout(null);
   //菜单栏
   jmenubar jmenubar = new jmenubar();
   jmenu jm = new jmenu("查看(v)");
   jmenu jm1 = new jmenu("编辑(e)");
   jmenu jm2 = new jmenu("帮助(h)");
   jmenubar.add(jm);
   jmenubar.add(jm1);
   jmenubar.add(jm2);
   this.setjmenubar(jmenubar);
   //输出框
   jtextfield = new jtextfield("0");
   jtextfield.setfont(new font("宋体", font.bold, 25));
   jtextfield.seteditable(false);
   jtextfield.sethorizontalalignment(jtextfield.right);
   jtextfield.setbounds(5, 5, 285, 65);
   ct.add(jtextfield);
   //按键    0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27
   str = new string[]{"mc", "mr", "ms", "m+", "m-", "←", "ce", "c", "±", "√", "7", "8", "9", "/", "%", "4", "5", "6", "*", "1/x", "1", "2", "3", "-", "=", "0", ".", "+"};
   int k = 0;
   for (int i = 75; i <= 195; i = i + 40) {
    for (int init = 10; init <= 290; init = init + 57) {
     jbutton jbutton = new jbutton(str[k]);
     jbs[k] = jbutton;
     jbutton.setbounds(init, i, 52, 35);
     ct.add(jbutton);
     k++;
     system.out.println(k);
    }
   }
   for (int i = 235; i < 265; i = i + 40) {
    for (int j = 10; j <= 181; j = j + 57) {
     jbutton jbutton = new jbutton(str[k]);
     jbutton.setbounds(j, i, 52, 35);
     ct.add(jbutton);
     jbs[k] = jbutton;
     k++;
     system.out.println(k);
    }
   }
   jbutton jbutton = new jbutton(str[k]);
   jbs[k] = jbutton;
   k++;
   system.out.println(k);
   jbutton.setbounds(240, 235, 52, 75);
   ct.add(jbutton);
   jbutton jbutton2 = new jbutton(str[k]);
   system.out.println(str[k]);
   jbutton2.setbounds(10, 275, 109, 35);
   ct.add(jbutton2);
   jbs[k] = jbutton2;
   k++;
   for (int i = 275; i < 310; i = i + 40) {
    for (int j = 124; j <= 181; j = j + 57) {
     jbutton jbutton1 = new jbutton(str[k]);
     jbutton1.setbounds(j, i, 52, 35);
     ct.add(jbutton1);
     jbs[k] = jbutton1;
     k++;
    }
   }
   for (int i = 0; i < 28; i++) {
    jbs[i].addactionlistener(this);
   }
   this.setvisible(true);
  }

  public static void main(string[] args) {
   new calculate();
  }


  @override
  public void actionperformed(actionevent actionevent) {
   if (actionevent.getactioncommand().equals(".")){
    method(actionevent);
   }else if (actionevent.getactioncommand().equals("0")){
    method(actionevent);
   } else if (actionevent.getactioncommand().equals("1")){
    method(actionevent);
   }else if(actionevent.getactioncommand().equals("2")){
    method(actionevent);
   }else if (actionevent.getactioncommand().equals("3")){
    method(actionevent);
   }else if (actionevent.getactioncommand().equals("4")){
    method(actionevent);
   }else if (actionevent.getactioncommand().equals("5")){
    method(actionevent);
   }else if (actionevent.getactioncommand().equals("6")){
    method(actionevent);
   }else if (actionevent.getactioncommand().equals("7")){
    method(actionevent);
   }else if (actionevent.getactioncommand().equals("8")){
    method(actionevent);
   }else if (actionevent.getactioncommand().equals("9")){
    method(actionevent);
   }else if (actionevent.getactioncommand().equals("±")){
    if(_count){
     if (cal[0].contains(".")){
      cal[0] = string.valueof(double.parsedouble(cal[0]) * (-1));
      jtextfield.settext(cal[0]);
     }else {
      cal[0] = string.valueof(integer.parseint(cal[0]) * (-1));
      jtextfield.settext(cal[0]);
     }
    }else {
     if (cal[2].contains(".")){
      cal[2] = string.valueof(double.parsedouble(cal[2]) * (-1));
      jtextfield.settext(cal[2]);
     }else {
      cal[2] = string.valueof(integer.parseint(cal[2]) * (-1));
      jtextfield.settext(cal[2]);
     }
    }
   }else if(actionevent.getactioncommand().equals("√")){
    if(_count){
     cal[0] = string.valueof(math.pow(double.parsedouble(cal[0]),0.5));
     jtextfield.settext(cal[0]);
    }else {
     cal[2] = string.valueof(math.pow(double.parsedouble(cal[2]),0.5));
     jtextfield.settext(cal[2]);
    }
   }else if(actionevent.getactioncommand().equals("1/x")){
    if(_count){
     cal[0] = string.valueof(1/double.parsedouble(cal[0]));
     jtextfield.settext(cal[0]);
    }else {
     cal[2] = string.valueof(1/double.parsedouble(cal[2]));
     jtextfield.settext(cal[2]);
    }
   }else if(actionevent.getactioncommand().equals("←")){
    if(_count){
     cal[0] = cal[0].substring(0,cal[0].length()-1);
     if(cal[0].equals("")){
      jtextfield.settext("0");
     }else {
      jtextfield.settext(cal[0]);
     }
    }else {
     cal[2] = cal[2].substring(0,cal[2].length()-1);
     if(cal[2].equals("")){
      jtextfield.settext("0");
     }else {
      jtextfield.settext(cal[2]);
     }
    }
   }else if(actionevent.getactioncommand().equals("ce")){
    if (_count){
     cal[0]="";
     jtextfield.settext("0");
    }else {
     cal[2]="";
     jtextfield.settext("0");
    }
   }else if(actionevent.getactioncommand().equals("c")){
    _count = true;
    cal[0]="";
    cal[1]="";
    cal[2]="";
    cal[3]="";
    jtextfield.settext("0");
   }else if (actionevent.getactioncommand().equals("+")){
    if (!cal[0].equals("")&&!cal[2].equals("")){
     if (cal[0].contains(".") || cal[2].contains(".")){
      cal[0]=string.valueof(double.parsedouble(cal[0]) + double.parsedouble(cal[2]));
     }else {
      cal[0] = string.valueof(integer.parseint(cal[0]) + integer.parseint(cal[2]));
     }
     cal[2]="";
    }
    cal[1] = "+";
    _count=false;
    jtextfield.settext(cal[1]);
   }else if (actionevent.getactioncommand().equals("-")){
    if (!cal[0].equals("")&&!cal[2].equals("")){
     if (cal[0].contains(".") || cal[2].contains(".")){
      cal[0]=string.valueof(double.parsedouble(cal[0]) - double.parsedouble(cal[2]));
     }else {
      cal[0] = string.valueof(integer.parseint(cal[0]) - integer.parseint(cal[2]));
     }
     cal[2]="";
    }
    cal[1] = "-";
    _count=false;
    jtextfield.settext(cal[1]);
   }else if (actionevent.getactioncommand().equals("*")){
    if (!cal[0].equals("")&&!cal[2].equals("")){
     if (cal[0].contains(".") || cal[2].contains(".")){
      cal[0]=string.valueof(double.parsedouble(cal[0]) * double.parsedouble(cal[2]));
     }else {
      cal[0] = string.valueof(integer.parseint(cal[0]) * integer.parseint(cal[2]));
     }
     cal[2]="";
    }
    cal[1] = "*";
    _count=false;
    jtextfield.settext(cal[1]);
   }else if (actionevent.getactioncommand().equals("/")){
    if (!cal[0].equals("")&&!cal[2].equals("")){
     if (cal[0].contains(".") || cal[2].contains(".")){
      cal[0]=string.valueof(double.parsedouble(cal[0]) / double.parsedouble(cal[2]));
     }else {
      cal[0] = string.valueof(integer.parseint(cal[0]) / integer.parseint(cal[2]));
     }
     cal[2]="";
    }
    cal[1] = "/";
    _count=false;
    jtextfield.settext(cal[1]);
   }else if (actionevent.getactioncommand().equals("%")){
    cal[0]=string.valueof(integer.parseint(cal[0]) % integer.parseint(cal[2]));
    cal[2]="";
    cal[1] = "%";
    _count=false;
    jtextfield.settext(cal[1]);
   }else if (actionevent.getactioncommand().equals("=")){
    if(cal[0].equals("")&&cal[2].equals("")){
     jtextfield.settext("0");
    }else if(!cal[0].equals("")&&cal[2].equals("")){
     jtextfield.settext(cal[0]);
    }else if(!cal[0].equals("")&&!cal[2].equals("")){
     if(cal[1].equals("+")){
      if (cal[0].contains(".") || cal[2].contains(".")){
       cal[3]=string.valueof(double.parsedouble(cal[0]) + double.parsedouble(cal[2]));
      }else {
       cal[3] = string.valueof(integer.parseint(cal[0]) + integer.parseint(cal[2]));
      }
      jtextfield.settext(cal[3]);
     }else if (cal[1].equals("-")){
      if (cal[0].contains(".") || cal[2].contains(".")){
       cal[3]=string.valueof(double.parsedouble(cal[0]) - double.parsedouble(cal[2]));
      }else {
       cal[3] = string.valueof(integer.parseint(cal[0]) - integer.parseint(cal[2]));
      }
      jtextfield.settext(cal[3]);
     }else if(cal[1].equals("*")){
      if (cal[0].contains(".") || cal[2].contains(".")){
       cal[3]=string.valueof(double.parsedouble(cal[0]) * double.parsedouble(cal[2]));
      }else {
       cal[3] = string.valueof(integer.parseint(cal[0]) * integer.parseint(cal[2]));
      }
      jtextfield.settext(cal[3]);
     }else if (cal[1].equals("/")){
      if (cal[0].contains(".") || cal[2].contains(".")){
       cal[3]=string.valueof(double.parsedouble(cal[0]) / double.parsedouble(cal[2]));
      }else {
       cal[3] = string.valueof(integer.parseint(cal[0]) / integer.parseint(cal[2]));
      }
      jtextfield.settext(cal[3]);
     }else if (cal[1].equals("%")){
      cal[3]=string.valueof(integer.parseint(cal[0]) % integer.parseint(cal[2]));
      jtextfield.settext(cal[3]);
     }
    }
    cal[0]=cal[3];
    cal[2]="";
    _count=true;
    _count1 = true;
    cal[5]=cal[0];
   }else if(actionevent.getactioncommand().equals("mc")){
    cal[4]="";
   }else if(actionevent.getactioncommand().equals("mr")){
    if(_count){
     if(!cal[4].equals("")){
      cal[0]=cal[4];
      jtextfield.settext(cal[0]);
     }
    }else {
     if(!cal[4].equals("")){
      cal[2]=cal[4];
      jtextfield.settext(cal[2]);
     }
    }
   }else if(actionevent.getactioncommand().equals("ms")){
    if(_count){
     cal[0]="";
    }
    cal[4]=cal[5];
    system.out.println("cal[5]"+cal[5]);
    system.out.println("ms:"+cal[4]);
   }else if(actionevent.getactioncommand().equals("m+")){
    if(!cal[4].equals("")){
     if (cal[4].contains(".") || cal[5].contains(".")){
      cal[4]=string.valueof(double.parsedouble(cal[4]) + double.parsedouble(cal[5]));
     }else {
      cal[4] = string.valueof(integer.parseint(cal[4]) + integer.parseint(cal[5]));
     }
    }
   }else if(actionevent.getactioncommand().equals("m-")){
    if(!cal[4].equals("")){
     if (cal[4].contains(".") || cal[5].contains(".")){
      cal[4]=string.valueof(double.parsedouble(cal[4]) - double.parsedouble(cal[5]));
     }else {
      cal[4] = string.valueof(integer.parseint(cal[4]) - integer.parseint(cal[5]));
     }
    }
   }
  }
  public void method(actionevent actionevent){
   if(_count){
    if (_count1){
     cal[0]="";
     _count1=false;
    }
    cal[0] += actionevent.getactioncommand();
    cal[5]=cal[0];
    system.out.println(cal[5]);
   }else {
    cal[2] += actionevent.getactioncommand();
    cal[5]=cal[2];
   }
   jtextfield.settext(actionevent.getactioncommand());
  }
}

效果图:

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。