j计算器，Java的计算器实现源代码

本文目录一览

1，Java的计算器实现源代码
2，用java做一个计算器
3，JAVA简单计算器
4，在JAVA中编写一个简单的计算器要求实现加减乘除功能
5，java计算器有高手给我讲解一下嘛
6，如何用JAVA编写计算器

1，Java的计算器实现源代码

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Java的计算器实现源代码

2，用java做一个计算器

public void jisuan(int a,int b,int c,int d,int e){ int result = ((a+b)*c-d)/e; System.out.println(result); }

public void jisuan(int a,int b,int c,int d,int e) Scanner sc = new Scanner(System.in); 　　a = sc.nextInt(); System.out.println("请输入a："); 　b = sc.nextInt(); System.out.println("请输入b："); c = sc.nextInt(); System.out.println("请输入c："); 　d = sc.nextInt(); System.out.println("请输入d：");　e = sc.nextInt(); System.out.println("请输入e："); int result = ((a+b)*c-d)/e; System.out.println("(("a+"+"+b")*"+c+"-"+d")/"+e"="+result); }

用java做一个计算器

3，JAVA简单计算器

用windows自带的计算器就可以。点击开始---〉程序---〉附件---〉计算器，打开就可以用了。

import java.awt.*; import java.awt.event.*; import javax.swing.*; public class jsq { public static void main(string args[]) { myframe. kk = new myframe(); } } //版本声明 class about extends jdialog { public about(frame. parent) { super(parent, true); initcomponents(); pack(); setsize(250, 150); setlocationrelativeto(parent); } private void initcomponents() { jtextfield1 = new jtextfield(); jtextfield2 = new jtextfield(); settitle("版本声明"); setresizable(false);//定义面板大小为固定 addwindowlistener(new windowadapter() { public void windowclosing(windowevent evt) { closedialog(evt); } }); jtextfield1.seteditable(false); jtextfield1.settext("计算器版本号: 1.0 "); jtextfield1.setbackground(color.lightgray); jtextfield2.seteditable(false); jtextfield2.settext(" ---开发者:wk"); getcontentpane().add(jtextfield1, borderlayout.north); getcontentpane().add(jtextfield2, borderlayout.center); } private void closedialog(windowevent evt) { setvisible(false); dispose(); } private jtextfield jtextfield1; private jtextfield jtextfield2; } class myframe. extends frame. implements actionlistener, mouselistener, windowlistener { menubar myb = new menubar(); menu menu1, menu2; char ch; //存储字符串中取得的一个字符 boolean ft1 = false; //标志小数点 boolean ft2 = false; //标志符号位 double firstnum = 0; //存储输入运算符前的数据 double nextnum = 0; //存储输入运算符后的数据 double resultnum = 0; //算得最终浮点型结果 string yunsuanfu = new string(); //存储输入的运算符 string linshistr = new string(); //存储临时的字符串 string resultstr = new string(); //存储算得的最终字符串型结果 string ss = new string(); //存储鼠标点击的按钮标号 string fuzhi = new string(); //存储复制的字符串 textfield shuru; button bt1[], bt2[]; panel pa1, pa2; gridlayout gri1, gri2;

JAVA简单计算器

4，在JAVA中编写一个简单的计算器要求实现加减乘除功能

public mycalculator() f = new jframe("计算器bymdou"); container contentpane = f.getcontentpane(); /****************菜单的创建开始**************************************/ 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); 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);

http://blog.csdn.net/YidingHe/archive/2009/04/15/4076550.aspx看看上面有源代码的。

5，java计算器有高手给我讲解一下嘛

import java.awt.*;import java.awt.event.*;import javax.swing.*;//以上引入所需要的三个包，awt是要创建组件所需；awt.event是给组件加触发事件所需class Jisuanqi extends JFrame implements ActionListener JTextField text1；//创建一个文本对象 JButton add,sub,mul,div,min,dot,equ,exit,clear; JButton s0,s1,s2,s3,s4,s5,s6,s7,s8,s9//创建19个按钮对象；Jisuanqi() super("计算器");//窗体名为计算器 setLayout(new BorderLayout());采用边界布局方式 JPanel m=new JPanel(); JPanel n=new JPanel(); JPanel k=new JPanel();//创建三个面板 add(m,"North");在南边添加面板m； add(n,"Center");同上类似m.setLayout(new FlowLayout());面板m的布局被顺序布局 n.setLayout(new GridLayout(4,4));面板n的布局被网格 4行4列 setSize(300,300); setVisible(true);、、窗体大小为300*300，可见text1=new JTextField(10);文本框输入为10个字；add=new JButton("+");按钮显示为+ sub=new JButton("-"); mul=new JButton("*"); div=new JButton("/"); min=new JButton("+/-"); dot=new JButton("."); equ=new JButton("="); clear=new JButton("C"); exit=new JButton("退出");//同上类似 m.add(text1); m.add(exit); m.add(equ); m.add(clear);//在面板m上增加文本框text1，按钮exit和equ s0=new JButton("0"); s1=new JButton("1"); s2=new JButton("2"); s3=new JButton("3"); s4=new JButton("4"); s5=new JButton("5"); s6=new JButton("6"); s7=new JButton("7"); s8=new JButton("8"); s9=new JButton("9");//创建显示为1~9的按钮 n.add(s7); n.add(s8); n.add(s9); n.add(add); n.add(s4); n.add(s5); n.add(s6); n.add(sub); n.add(s1); n.add(s2); n.add(s3); n.add(mul); n.add(min); n.add(s0); n.add(dot); n.add(div);//在面板n上加s7~div的按钮text1.addActionListener(this);//将文本text1加入触发响应事件，this表示text1这个对象本身add.addActionListener(this); sub.addActionListener(this); mul.addActionListener(this); div.addActionListener(this); min.addActionListener(this); dot.addActionListener(this); exit.addActionListener(this); equ.addActionListener(this); clear.addActionListener(this); s0.addActionListener(this); s1.addActionListener(this); s2.addActionListener(this); s3.addActionListener(this); s4.addActionListener(this); s5.addActionListener(this); s6.addActionListener(this); s7.addActionListener(this); s8.addActionListener(this); s9.addActionListener(this);//同上解释

6，如何用JAVA编写计算器

jave 么？不知道c++可不可以榜上你呢？ #include <stdio> void main() int i; int j; for(i=1;i<=9;i++) for(j=1;j<=i;j++) printf("%d*%d=%d",i,j,i*j); } printf("\n"); }

简易的计算器 import java.awt.BorderLayout;import java.awt.Color;import java.awt.GridLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.math.BigDecimal; import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JPanel;import javax.swing.JTextField; public class Calcular implements ActionListener JTextField jtf = new JTextField(10); boolean flag = false; boolean emblem = false; @SuppressWarnings("static-access") public Calcular() JFrame jf = new JFrame("testcalcular"); jf.setLayout(new BorderLayout()); jtf.setEditable(false); jtf.setHorizontalAlignment(JTextField.RIGHT); jtf.setText("0"); JPanel jp = new JPanel(); jp.setLayout(new GridLayout(5, 4)); String[] lab = "6", "*", "3", "2", "1", "/", "0", "+/-", ".", "=" }; JButton[] jb = new JButton[lab.length]; for (int i = 0; i < jb.length; i++) jb[i] = new JButton(lab[i]); if (lab[i].matches("^\\d$")) jb[i].setBackground(Color.PINK); } else if (lab[i].matches("^[a-zA-Z]+$")) jb[i].setBackground(Color.GREEN); } else jb[i].setBackground(Color.LIGHT_GRAY); } jb[i].addActionListener(this); jp.add(jb[i]); } jf.add(jtf, BorderLayout.NORTH); jf.add(jp); jf.setSize(300, 200); jf.setLocation(300, 200); jf.setResizable(false); jf.setVisible(true); jf.setDefaultCloseOperation(jf.EXIT_ON_CLOSE); } public static void main(String[] args) new Calcular(); } public void actionPerformed(ActionEvent e) String comm = e.getActionCommand(); if ("CE".equals(comm)) jtf.setText("0"); flag = false; emblem = false; } else if ("C".equals(comm)) jtf.setText("0"); flag = false; emblem = false; } else if ("BACK".equals(comm)) String com = jtf.getText() + comm; com = com.substring(0, com.length() - 5); if (com.length() == 0) jtf.setText("0"); flag = false; } else jtf.setText(com); } } else if ("+-*/".contains(comm)) if (emblem) String num = number(jtf.getText()); jtf.setText(num + comm); emblem = false; } else String number = jtf.getText() + comm; jtf.setText(number); emblem = true; } } else if ("=".equals(comm)) emblem = false; jtf.setText(number(jtf.getText())); } else if ("+/-".equals(comm)) String com = jtf.getText(); com = com.substring(0, 1); if ("-".equals(com)) com = jtf.getText(); com = com.substring(1, com.length()); jtf.setText(com); } else com = "-" + jtf.getText(); jtf.setText(com); } } else if (flag) String com = jtf.getText() + comm; jtf.setText(com); } else jtf.setText(comm); if ("0".equals(comm)) flag = false; } else flag = true; } } } } public String number(String s) BigDecimal a = null; String ss = "^[-] String sss = "^\\d+[\\+\\-\\*\\/] if (s.matches(sss)) if (s.contains("*")) String[] str = s.split("\\*"); BigDecimal b1 = new BigDecimal(str[0]); BigDecimal b2 = new BigDecimal(str[1]); a = b1.multiply(b2); } if (s.contains("/")) String[] str = s.split("\\/"); BigDecimal b1 = new BigDecimal(str[0]); BigDecimal b2 = new BigDecimal(str[1]); a = b1.divide(b2, 10, BigDecimal.ROUND_HALF_UP); } if (s.contains("+")) String[] str = s.split("\\+"); BigDecimal b1 = new BigDecimal(str[0]); BigDecimal b2 = new BigDecimal(str[1]); a = b1.add(b2); } if (s.contains("-")) String[] str = s.split("\\-"); BigDecimal b1 = new BigDecimal(str[0]); BigDecimal b2 = new BigDecimal(str[1]); a = b1.subtract(b2); } } else if (s.matches(ss)) s = s.substring(1); if (s.contains("*")) String[] str = s.split("\\*"); BigDecimal b1 = new BigDecimal("-" + str[0]); BigDecimal b2 = new BigDecimal(str[1]); a = b1.multiply(b2); } if (s.contains("/")) String[] str = s.split("\\/"); BigDecimal b1 = new BigDecimal("-" + str[0]); BigDecimal b2 = new BigDecimal(str[1]); a = b1.divide(b2, 10, BigDecimal.ROUND_HALF_UP); } if (s.contains("+")) String[] str = s.split("\\+"); BigDecimal b1 = new BigDecimal("-" + str[0]); BigDecimal b2 = new BigDecimal(str[1]); a = b1.add(b2); } if (s.contains("-")) String[] str = s.split("\\-"); BigDecimal b1 = new BigDecimal("-" + str[0]); BigDecimal b2 = new BigDecimal(str[1]); a = b1.subtract(b2); } } else return "ERROR"; } return a.toString(); }}

我这里有一个实现基本的加减乘除功能： import javax.swing.*; import javax.swing.border.Border; import java.awt.*; import java.awt.event.ActionListener; import java.awt.event.ActionEvent; import java.math.BigDecimal; import java.math.RoundingMode; import java.util.HashMap; /** * 功能：在JAVA中编写一个简单的计算器。要求实现加、减、乘、除功能。 * @author 飛龍劍 * @date 2009-11-01 */ /** * 我的计算器。MyCalculator 继承于 JFrame，是计算器的界面 */ public class MyCalculator extends JFrame private Border border = BorderFactory.createEmptyBorder(5, 5, 5, 5); private JTextField textbox = new JTextField("0"); private CalculatorCore core = new CalculatorCore(); private ActionListener listener = new ActionListener() public void actionPerformed(ActionEvent e) JButton b = (JButton) e.getSource(); String label = b.getText(); String result = core.process(label); textbox.setText(result); } }; public MyCalculator(String title) throws HeadlessException super(title); // 调用父类构造方法 setupFrame(); // 调整窗体属性 setupControls(); // 创建控件 } private void setupControls() setupDisplayPanel(); // 创建文本面板 setupButtonsPanel(); // 创建按钮面板 } // 创建按钮面板并添加按钮 private void setupButtonsPanel() JPanel panel = new JPanel(); panel.setBorder(border); panel.setLayout(new GridLayout(4, 5, 3, 3)); createButtons(panel, new String[] "7", "8", "9", "+", "C", "4", "5", "6", "-", "CE", "1", "2", "3", "*", "空", // 空字符串表示这个位置没有按钮 "0", ".", "=", "/", "空" }); this.add(panel, BorderLayout.CENTER); }