用Java設(shè)計(jì)一個圖形界面（GUI）的計(jì)算器應(yīng)用程序，完成簡單的算術(shù)運(yùn)算

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五分鐘搞定，先給你發(fā)個簡單的，照例子自己去做你想要的計(jì)算器

package aaa;

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class YunSuan implements ActionListener,ItemListener

{

public static JFrame jf;

public static Container c;

public static JTextField jtf1,jtf2,jtf3;

public static JButton jb1;

public static Choice c2;

public static String fuhao="";

public YunSuan()

{

jf=new JFrame("加減乘除運(yùn)算");

c=jf.getContentPane();

c.setLayout(new FlowLayout());

jtf1=new JTextField(10);

jtf2=new JTextField(10);

jtf3=new JTextField(10);

c2=new Choice();

jb1=new JButton("=");

}

public void Jiemian()

{

c.add(jtf1);

c2.addItemListener(this);

c2.add("");

c2.add("+");

c2.add("-");

c2.add("*");

c2.add("/");

c.add(c2);

c.add(jtf2);

jb1.addActionListener(this);

c.add(jb1);

c.add(jtf3);

jf.setLocation(200,100);

jf.setVisible(true);

jf.pack();

}

public static void main(String args[])

{

YunSuan ys=new YunSuan();

ys.Jiemian();

}

public void actionPerformed(ActionEvent e) {

// TODO Auto-generated method stub

double s1=Integer.parseInt(jtf1.getText());

double s2=Integer.parseInt(jtf2.getText());

double result=0;

if(fuhao.equals("+"))

{

result=s1+s2;

String result2=String.valueOf(result);

jtf3.setText(result2);

}

if(fuhao.equals("-"))

{

result=s1-s2;

String result2=String.valueOf(result);

jtf3.setText(result2);

}

if(fuhao.equals("*"))

{

result=s1*s2;

String result2=String.valueOf(result);

jtf3.setText(result2);

}

if(fuhao.equals("/"))

{

result=s1/s2;

String result2=String.valueOf(result);

jtf3.setText(result2);

}

}

public void itemStateChanged(ItemEvent ie)

{

if(ie.getSource()==c2)

{

String str1=c2.getSelectedItem();

fanhui(str1);

}

}

public String fanhui(String str2)

{

return fuhao=str2;

}

}

用java編寫程序 課題：算術(shù)運(yùn)算測試

你好，按照你的要求代碼如下，可以直接運(yùn)行

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

public class test {

public static void main(String[] args) {

int count = 0;

BufferedReader in = new BufferedReader(new InputStreamReader(System.in));

for (int i = 0; i 10; i++) {

int a = (int) (Math.random() * 100);

int b = (int) (Math.random() * 100);

int c = (int) (Math.random() * 2);

int r = 0;

switch (c) {

case 0:

if (a + b = 100) {

a = 100 - b;

}

System.out.print(a + " + " + b + " = ");

r = a + b;

break;

case 1:

if (a b) {

int t = a;

a = b;

b = t;

}

System.out.print(a + " - " + b + " = ");

r = a - b;

}

int input;

try {

input = Integer.valueOf(in.readLine());

} catch (Exception e1) {

System.out.println("答案錯誤\n");

continue;

}

if (input == r) {

count++;

System.out.println("答案正確\n");

} else {

System.out.println("答案錯誤\n");

}

}

if (null != in) {

try {

in.close();

} catch (IOException e) {

e.printStackTrace();

}

}

System.out.println("答對數(shù)量：" + count + "\n得分: " + count * 10);

}

}

求編寫一個超級簡單的Java的程序源代碼

class Stack_Float

{

float nums[];

int top;

Stack_Float()

{

nums = new float[50];

top = -1;

}

boolean IsEmpty()

{

if(top == -1)

return true;

else

return false;

}

float Pop_Stack()

{

if(top==-1)

{

return 0;

}

top--;

return nums[top + 1];

}

float GetTop()

{

return nums[top];

}

void Push_Stack(float num)

{

if(top == 49)

return;

top++;

nums[top] = num;

}

}

/*****************************************************************************/

class Stack_Char

{

char str[];

int top;

Stack_Char()

{

str = new char[50];

top = -1;

}

boolean IsEmpty()

{

if(top==-1)

return true;

else

return false;

}

void Push_Stack(char ch)

{

if(top == 49)

return;

top++;

str[top] = ch;

}

char Pop_Stack()

{

if(top == -1)

return '\0';

top--;

return str[top + 1];

}

char GetTop()

{

if(top == -1)

{

System.out.print("error");

System.exit(0);

}

return str[top];

}

}

/*****************************************************************************/

public class jisuanqi extends javax.swing.JFrame

{

String show = "";

public jisuanqi()

{

initComponents();

}

char[] TranSmit(char str[])

{

char houzhui[] = new char[50]; //存放后綴表達(dá)式的字符串

int i = 0,j = 0;

char c = str[i];

Stack_Char s = new Stack_Char(); //存放運(yùn)算符的棧

while(c != '=') //對算術(shù)表達(dá)式掃描未結(jié)束時

{

if(c = '0' c = '9')

{

while(c = '0' c = '9')//數(shù)字直接入棧

{

houzhui[j]=c;

j++;

i++;

c=str[i];

}

houzhui[j]='#';//用#隔開數(shù)字

j++;

}

switch(c) //掃描到運(yùn)算符時

{

case '+':

case '-':

case '*':

case '/':

if(s.IsEmpty() == true) //棧空,直接入棧

{

s.Push_Stack(c);

i++;

c=str[i];

break;

}

if(ComPare(s.GetTop(),c) == -1)

{

s.Push_Stack(c); //入棧

i++;

c=str[i];

break;

}

if(ComPare(s.GetTop(),c) == 1)

{

houzhui[j]=s.Pop_Stack();//出棧元素存入后綴表達(dá)式

j++;

break;

}

}

}

while(s.IsEmpty() != true)//把剩余的運(yùn)算符直接出棧

{

houzhui[j]=s.Pop_Stack();

j++;

}

houzhui[j] = '=';//后綴表達(dá)式后面加 =

j++;

houzhui[j] = '\0';

j++;

return houzhui;

}

float Count(char str[])

{

Stack_Float s = new Stack_Float();//定義存放數(shù)字的棧

char c = str[0];

int i = 0,j = 0;

float result = 0,temp,left,right;

while(c != '=') //未掃描到 = 時

{

if(c = '0' c = '9')//掃描到數(shù)字

{

temp = 0;

while(c != '#')//未讀到分隔符時

{

temp = temp * 10 + c - '0';

i++;

c = str[i];

}

s.Push_Stack(temp);//進(jìn)棧

}

switch(c)//掃描到運(yùn)算符時

{

case '+':

{

result = s.Pop_Stack() + s.Pop_Stack();//2個數(shù)字出棧相加

s.Push_Stack(result);//最后得數(shù)進(jìn)棧

break;

}

case '-':

{

right = s.Pop_Stack();//右操作數(shù)出棧

left = s.Pop_Stack();//左操作數(shù)出棧

result = left - right;

s.Push_Stack(result);

break;

}

case '*':

{

result = s.Pop_Stack() * s.Pop_Stack();//2個數(shù)字出棧相乘

s.Push_Stack(result);

break;

}

case '/':

{

right = s.Pop_Stack();//右操作數(shù)出棧

left = s.Pop_Stack();//左操作數(shù)出棧

result = left / right;

s.Push_Stack(result);

break;

}

}

i++;

c = str[i];

}

return result;

}

int ComPare(char a,char b) //判斷運(yùn)算符的優(yōu)先級函數(shù)

{

int s[][] =

{// 棧頂元素高于算術(shù)表達(dá)式中的元素時, 返回 1,否則返回 -1

{1,1,-1,-1},

{1,1,-1,-1},

{1,1,1,1},

{1,1,1,1},

};

char x1[]={'+','-','*','/'};//棧頂元素

char x2[]={'+','-','*','/'};//算術(shù)表達(dá)式中的元素

int k=0,m,n = 0;

for(m=0;m4;m++) //查找2個進(jìn)行比較的運(yùn)算符在表中的位置,并返回比較結(jié)果

{

for(n=0;n4;n++)

{

if(x1[m]==ax2[n]==b)

{

k=1;break; //找到比較結(jié)果后,跳出循環(huán)

}

}

if(k==1)

break;

}

return s[m][n];//返回比較結(jié)果

}

/*****************************************************************************/

@SuppressWarnings("unchecked")

// editor-fold defaultstate="collapsed" desc="Generated Code"http://GEN-BEGIN:initComponents

private void initComponents() {

text = new javax.swing.JTextField();

jButton1 = new javax.swing.JButton();

jButton2 = new javax.swing.JButton();

jButton3 = new javax.swing.JButton();

jButton4 = new javax.swing.JButton();

jButton5 = new javax.swing.JButton();

jButton6 = new javax.swing.JButton();

jButton7 = new javax.swing.JButton();

jButton8 = new javax.swing.JButton();

jButton9 = new javax.swing.JButton();

jButton10 = new javax.swing.JButton();

jButton11 = new javax.swing.JButton();

jButton12 = new javax.swing.JButton();

jButton13 = new javax.swing.JButton();

jButton14 = new javax.swing.JButton();

jButton21 = new javax.swing.JButton();

jButton22 = new javax.swing.JButton();

setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

getContentPane().setLayout(null);

getContentPane().add(text);

text.setBounds(10, 10, 270, 30);

jButton1.setText("1");

jButton1.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

jButton1ActionPerformed(evt);

}

});

getContentPane().add(jButton1);

jButton1.setBounds(10, 50, 60, 25);

jButton2.setText("2");

jButton2.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

jButton2ActionPerformed(evt);

}

});

getContentPane().add(jButton2);

jButton2.setBounds(80, 50, 60, 25);

jButton3.setText("3");

jButton3.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

jButton3ActionPerformed(evt);

}

});

getContentPane().add(jButton3);

jButton3.setBounds(150, 50, 60, 25);

jButton4.setText("4");

jButton4.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

jButton4ActionPerformed(evt);

}

});

getContentPane().add(jButton4);

jButton4.setBounds(220, 50, 60, 25);

jButton5.setText("5");

jButton5.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

jButton5ActionPerformed(evt);

}

});

getContentPane().add(jButton5);

jButton5.setBounds(10, 80, 60, 25);

jButton6.setText("6");

jButton6.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

jButton6ActionPerformed(evt);

}

});

getContentPane().add(jButton6);

jButton6.setBounds(80, 80, 60, 25);

jButton7.setText("7");

jButton7.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

jButton7ActionPerformed(evt);

}

});

getContentPane().add(jButton7);

jButton7.setBounds(150, 80, 60, 25);

jButton8.setText("8");

jButton8.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

jButton8ActionPerformed(evt);

}

});

getContentPane().add(jButton8);

jButton8.setBounds(220, 80, 60, 25);

jButton9.setText("9");

jButton9.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

jButton9ActionPerformed(evt);

}

});

getContentPane().add(jButton9);

jButton9.setBounds(10, 110, 60, 25);

jButton10.setText("0");

jButton10.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

jButton10ActionPerformed(evt);

}

});

getContentPane().add(jButton10);

jButton10.setBounds(80, 110, 60, 25);

jButton11.setText("+");

jButton11.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

jButton11ActionPerformed(evt);

}

});

getContentPane().add(jButton11);

jButton11.setBounds(150, 110, 60, 25);

jButton12.setText("-");

jButton12.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

jButton12ActionPerformed(evt);

}

});

getContentPane().add(jButton12);

jButton12.setBounds(220, 110, 60, 25);

jButton13.setText("*");

jButton13.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

jButton13ActionPerformed(evt);

}

});

getContentPane().add(jButton13);

jButton13.setBounds(10, 140, 60, 25);

jButton14.setText("/");

jButton14.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

jButton14ActionPerformed(evt);

}

});

getContentPane().add(jButton14);

jButton14.setBounds(80, 140, 60, 25);

jButton21.setText("CE");

jButton21.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

jButton21ActionPerformed(evt);

}

});

getContentPane().add(jButton21);

jButton21.setBounds(150, 140, 60, 25);

jButton22.setText("=");

jButton22.addActionListener(new java.awt.event.ActionListener() {

public void actionPerformed(java.awt.event.ActionEvent evt) {

jButton22ActionPerformed(evt);

}

});

getContentPane().add(jButton22);

jButton22.setBounds(220, 140, 60, 25);

pack();

}// /editor-fold//GEN-END:initComponents

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton1ActionPerformed

show += "1";

text.setText(show);

}//GEN-LAST:event_jButton1ActionPerformed

private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton2ActionPerformed

show += "2";

text.setText(show);

}//GEN-LAST:event_jButton2ActionPerformed

private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton3ActionPerformed

show += "3";

text.setText(show);

}//GEN-LAST:event_jButton3ActionPerformed

private void jButton4ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton4ActionPerformed

show += "4";

text.setText(show);

}//GEN-LAST:event_jButton4ActionPerformed

private void jButton5ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton5ActionPerformed

show += "5";

text.setText(show);

}//GEN-LAST:event_jButton5ActionPerformed

private void jButton6ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton6ActionPerformed

show += "6";

text.setText(show);

}//GEN-LAST:event_jButton6ActionPerformed

private void jButton7ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton7ActionPerformed

show += "7";

text.setText(show);

}//GEN-LAST:event_jButton7ActionPerformed

private void jButton8ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton8ActionPerformed

show += "8";

text.setText(show);

}//GEN-LAST:event_jButton8ActionPerformed

private void jButton9ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton9ActionPerformed

show += "9";

text.setText(show);

}//GEN-LAST:event_jButton9ActionPerformed

private void jButton10ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton10ActionPerformed

show += "0";

text.setText(show);

}//GEN-LAST:event_jButton10ActionPerformed

private void jButton13ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton13ActionPerformed

show += "*";

text.setText(show);

}//GEN-LAST:event_jButton13ActionPerformed

private void jButton14ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton14ActionPerformed

show += "/";

text.setText(show);

}//GEN-LAST:event_jButton14ActionPerformed

private void jButton21ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton21ActionPerformed

show = "";

text.setText("");

}//GEN-LAST:event_jButton21ActionPerformed

private void jButton22ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton22ActionPerformed

show += "=";

text.setText(show);

char str1[] = new char[50];

char str2[] = new char[50];

float result = 0;

str1 = show.toCharArray();

str2 = TranSmit(str1);

result = Count(str2);

text.setText("" + result);

show = "";

}//GEN-LAST:event_jButton22ActionPerformed

private void jButton12ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton12ActionPerformed

show += "-";

text.setText(show);

}//GEN-LAST:event_jButton12ActionPerformed

private void jButton11ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton11ActionPerformed

show += "+";

text.setText(show);

}//GEN-LAST:event_jButton11ActionPerformed

public static void main(String args[])

{

jisuanqi j = new jisuanqi();

j.setBounds(300, 300, 300, 195);

j.setVisible(true);

}

// Variables declaration - do not modify//GEN-BEGIN:variables

private javax.swing.JButton jButton1;

private javax.swing.JButton jButton10;

private javax.swing.JButton jButton11;

private javax.swing.JButton jButton12;

private javax.swing.JButton jButton13;

private javax.swing.JButton jButton14;

private javax.swing.JButton jButton2;

private javax.swing.JButton jButton21;

private javax.swing.JButton jButton22;

private javax.swing.JButton jButton3;

private javax.swing.JButton jButton4;

private javax.swing.JButton jButton5;

private javax.swing.JButton jButton6;

private javax.swing.JButton jButton7;

private javax.swing.JButton jButton8;

private javax.swing.JButton jButton9;

private javax.swing.JTextField text;

// End of variables declaration//GEN-END:variables

}

Java編寫一個能夠自動生成小朋友算術(shù)練習(xí)題目的程序。設(shè)計(jì)一個程序，要求能夠隨機(jī)生成每個題目。

package?com.demo;

import?java.math.BigDecimal;

import?java.util.Random;

import?java.util.Scanner;

/*

*?Java編寫一個能夠自動生成小朋友算術(shù)練習(xí)題目的程序。設(shè)計(jì)一個程序，要求能夠隨機(jī)生成每個題目。

*?編寫一個能夠自動生成小朋友算術(shù)練習(xí)題目的程序。設(shè)計(jì)一個程序，要求能夠隨機(jī)生成每個題目，并具有以下基本功能：

*?（1）要求題目以單項(xiàng)選擇題及填空題兩種形式出現(xiàn)。

*?（2）完成一題后自動判斷答案是否正確，分別彈出不同的提示，并自動更新成下一題。

*?（3）單擊“退出”時，匯總本次計(jì)算結(jié)果，共完成幾題，正確率，并給出相應(yīng)評語。確定后正式退出。

*/

public?class?publicDemo2?{

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

Random?random?=?new?Random();

StringBuilder?stringBuilder?=?new?StringBuilder();

String[]?symbol?=?{"+","-","*","/"};

String?question_tip?=?"選擇題(除法保留小數(shù)點(diǎn)后兩位)：";

stringBuilder.append(question_tip).append("\n");

System.out.println(question_tip);

int?a;

int?b;

String?f;

String?result_str;

for?(int?i=1;i11;i++){

a?=?random.nextInt(50);

b?=?random.nextInt(50);

f?=?symbol[random.nextInt(3)];

String?question?=?i+"、"+a+f+b+"=";

System.out.println(question);

stringBuilder.append(question);

Scanner?sc?=?new?Scanner(System.in);

String?sc_str?=?sc.next();

if("/".equals(f)){

double?scan_value?=?Double.parseDouble(sc_str);

double?result_value?=?a?/?b;

BigDecimal?bigDecimal1?=?new?BigDecimal(scan_value);

scan_value?=?bigDecimal1.setScale(2,?BigDecimal.ROUND_HALF_UP).doubleValue();

BigDecimal?bigDecimal2?=?new?BigDecimal(result_value);

result_value?=?bigDecimal2.setScale(2,?BigDecimal.ROUND_HALF_UP).doubleValue();

result_str?=?(scan_value==result_value)?"回答正確！":"回答錯誤！";

stringBuilder.append(scan_value).append(";(答案："+result_value+")"+result_str).append("\n");

}else{

int?scan_value?=?Integer.parseInt(sc_str);

int?result_value;

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

result_value?=?a?+?b;

}else?if("-".equals(f)){

result_value?=?a?-?b;

}else?if("*".equals(f)){

result_value?=?a?*?b;

}else{

break;

}

result_str?=?(scan_value==result_value)?"回答正確！":"回答錯誤！";

stringBuilder.append(scan_value).append(";(答案："+result_value+")"+result_str).append("\n");

}

}

System.out.println(stringBuilder.toString());

}

}

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