java計(jì)算器簡(jiǎn)易代碼,java做計(jì)算器代碼

編寫(xiě)java程序簡(jiǎn)單計(jì)算器

主要涉及的知識(shí)點(diǎn): 類(lèi)的寫(xiě)法, 以及方法的調(diào)用 .建議多做練習(xí). 如果有看不懂的地方. 可以繼續(xù)追問(wèn),一起討論.

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參考代碼如下

//Number類(lèi)

class?Number?{

private?int?n1;//私有的整型數(shù)據(jù)成員n1

private?int?n2;//私有的整型數(shù)據(jù)成員n2

//?通過(guò)構(gòu)造函數(shù)給n1和n2賦值

public?Number(int?n1,?int?n2)?{

this.n1?=?n1;

this.n2?=?n2;

}

//?加法

public?int?addition()?{

return?n1?+?n2;

}

//?減法

public?int?subtration()?{

return?n1?-?n2;

}

//?乘法

public?int?multiplication()?{

return?n1?*?n2;

}

//?除法?(可能除不盡,所以使用double作為返回類(lèi)型)

public?double?division()?{

return?n1?*?1.0?/?n2;?//?通過(guò)n1*1.0?把計(jì)算結(jié)果轉(zhuǎn)換成double類(lèi)型.

}

//Exam4?類(lèi)

public?class?Exam4{

public?static?void?main(String[]?args)?{

Number?number=new?Number(15,?6);//創(chuàng)建Number類(lèi)的對(duì)象

//下面的是調(diào)用方法得到返回值進(jìn)行輸出顯示

System.out.println("加法"+number.addition());

System.out.println("減法"+number.subtration());

System.out.println("乘法"+number.multiplication());

System.out.println("除法"+number.division());

}

求大神發(fā)個(gè)完整簡(jiǎn)單的java計(jì)算器代碼，

public static void main(String[] args) {

System.out.println("簡(jiǎn)單計(jì)算器");

boolean flag=true;//while循環(huán)是否繼續(xù)，true繼續(xù)循環(huán)，false停止循環(huán)

System.out.println("請(qǐng)輸入第一個(gè)數(shù)字");

while(flag){

Scanner scan = new Scanner(System.in);

String bh=scan.next();

try {

double num = Double.parseDouble(bh);

System.out.println("請(qǐng)輸入符號(hào)(+、-、*、/)");

while(1==1){

String fh=scan.next();

if("+".equals(fh) || "-".equals(fh) || "*".equals(fh) || "/".equals(fh)){

System.out.println("請(qǐng)輸入第二個(gè)數(shù)字");

while(1==1){

String bh2=scan.next();

try {

double num2 = Double.parseDouble(bh2);

double num3=0;

if("+".equals(fh)){

num3=num+num2;

}else if("-".equals(fh)){

num3=num-num2;

}else if("*".equals(fh)){

num3=num*num2;

}else if("/".equals(fh)){

num3=num/num2;

}

System.out.println(num3);

break;

} catch (Exception e) {

System.out.println("請(qǐng)輸入第二個(gè)正確的數(shù)字");

continue;

}

break;

}else{

System.out.println("請(qǐng)輸入正確的符號(hào)(+、-、*、/)");

continue;

}

System.out.println("是否繼續(xù)運(yùn)算:輸入Y或者y繼續(xù)，輸入其它任意字符退出");

String yn=scan.next();

if("Y".equals(yn) || "y".equals(yn)){

continue;

}else{

System.out.println("運(yùn)算結(jié)束");

break;

}

}catch (NumberFormatException e) {//輸入非數(shù)字類(lèi)型時(shí)

System.out.println("請(qǐng)輸入第一個(gè)正確的數(shù)字");

continue;

}

急求java簡(jiǎn)易計(jì)算器代碼

試試下面的代碼絕對(duì)沒(méi)有錯(cuò)誤。

package main;

import java.awt.Button;

import java.awt.Color;

import java.awt.GridLayout;

import java.awt.Panel;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.math.BigDecimal;

import javax.swing.JFrame;

import javax.swing.JTextField;

public class app7 extends JFrame implements ActionListener {

static Panel pan = new Panel();

static JTextField textField = new JTextField("0");

static Button b0, b1, b2, b3, b4, b5, b6, b7, b8, b9, bp, ba, bs, bm, bd,

be, bc, bt, bf, bh;

private StringBuffer temp = new StringBuffer("");

private String optValue = "0";

private String optType="";

private boolean isChoiseOptType=true;

public void init() {

b0 = new Button("0");

b0.addActionListener(this);

b1 = new Button("1");

b1.addActionListener(this);

b2 = new Button("2");

b2.addActionListener(this);

b3 = new Button("3");

b3.addActionListener(this);

b4 = new Button("4");

b4.addActionListener(this);

b5 = new Button("5");

b5.addActionListener(this);

b6 = new Button("6");

b6.addActionListener(this);

b7 = new Button("7");

b7.addActionListener(this);

b8 = new Button("8");

b8.addActionListener(this);

b9 = new Button("9");

b9.addActionListener(this);

bp = new Button(".");

bp.addActionListener(this);

ba = new Button("+");

ba.addActionListener(this);

bs = new Button("-");

bs.addActionListener(this);

bm = new Button("*");

bm.addActionListener(this);

bd = new Button("/");

bd.addActionListener(this);

be = new Button("=");

be.addActionListener(this);

bc = new Button("c");

bc.addActionListener(this);

bt = new Button("退格");

bt.addActionListener(this);

bf = new Button("1/x");

bf.addActionListener(this);

bh = new Button("+/-");

bh.addActionListener(this);

this.setTitle("計(jì)算機(jī)");

this.setLayout(null);

this.setSize(260, 300);

this.setResizable(false);

GridLayout grid = new GridLayout(4, 5);

pan.setLayout(grid);

pan.setBounds(20, 60, 150, 120);

textField.setBounds(20, 35, 150, 20);

textField.setBackground(Color.cyan);

textField.setHorizontalAlignment(textField.RIGHT);

textField.setEditable(false);

pan.add(b1);

pan.add(b2);

pan.add(b3);

pan.add(ba);

pan.add(bc);

pan.add(b4);

pan.add(b5);

pan.add(b6);

pan.add(bs);

pan.add(bt);

pan.add(b7);

pan.add(b8);

pan.add(b9);

pan.add(bm);

pan.add(bf);

pan.add(b0);

pan.add(bh);

pan.add(bp);

pan.add(bd);

pan.add(be);

this.add(textField);

this.add(pan);

}

public static void main(String[] args) {

app7 frm = new app7();

frm.init();

frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frm.setVisible(true);

}

@SuppressWarnings("static-access")

@Override

public void actionPerformed(ActionEvent e) {

String value="0";

if (e.getSource().equals(b0)) {

this.temp.append(b0.getLabel());