java计算器代码及实验报告

时间：2024.3.19

一、实验内容

题目：1、设计一个计算器

要求：1、使用layout进行布局，使界面更加友好

2、实现整数的加减乘除运算（不考虑优先级）二、实验过程

（这是实验报告极其重要的内容。要抓住重点，可以从理论和实践两个方面考虑。这部分要写明依据什么知识点以及使用方法进行实验以及实验步骤。不要简单照抄实习指导，更不可写一大堆源代码）

二、实验过程

1、进行计算器界面的布局：

a 、Panel的嵌套布局：

主要设置了七个Panel来将界面分成几个部分。且Panel都是用borderLayout来进行的布局。

如图所示，其中4、5、6、7分别表示Panel4、Panel5、Panel6、Panel7

Panel2由Panel4、Panel5组成；Panel3由Panel6、Panel7组成；

Panel1由Panel2、Panel3组成；

b、

（1）、在Panel6添加一个按钮并将border设置成LoweredBevel，设置按钮大小，并给按钮命名

（2）、将Panel7的layout 设置成FlowLayout，并添加三个按钮，设置按钮大小，并给按钮命名

（3）、将Panel5的layout 设置成gridLayout，并添加四个按钮，设置按钮大小，并给按钮命名

（4）、将Panel4的layout 设置成gridLayout，并添加二十个按钮，设置按钮大小，并给按钮命名

2、给对应按钮添加方法，实现起相应的功能

三、实验结果

1、计算器界面

2、实现功能

能进行整数基本的加减乘除运算、及其连续运算、清零。

四、讨论与分析

1、此实验主要是进行计算器界面的布局，根据电脑上的计算器设计布局

主要设置了七个Panel来将界面分成几个部分。且Panel都是用borderLayout来进行的布局。

2、刚刚开始不能实现连续运算，本程序的设计思路是，读取两次文本框的内容赋值给a,b。

后来在原来的基础上增加了一个标志位，判断符号是不是第一次输入，如果不是则调用等于按钮功能，实现与等于相同的功能。

五、附录：关键代码

1、数字按钮方法：

如0：如果之前只输入过一次符号，则将数字添加在之前的数后面，否则将文本框置为数字"0"。

void num0_actionPerformed(ActionEvent e) {

if(flag1 == 0)

jTextField1.setText(jTextField1.getText() + "0");

else

{

jTextField1.setText("0");

flag1 = 0;

}

其它数字键相同的处理方法，即数字不一样

2、运算按钮：

若为加

void add_actionPerformed(ActionEvent e) {

if (flag == 0) {

a = Integer.parseInt(jTextField1.getText());

jTextField1.setText("");

}

else {

equ_actionPerformed(e);

flag1 = 1;

b = 0;

}

flag = 1;

}

若此次运算过程中第一次输入加号，则将文本框的内容转换成int型并赋值给a,再将文本框置空。否则，调用等于按钮方法，并将flag1 置1，b清零。最后符号位置1。

若为加法符号标志flag置1。若为减，符号标志flag置2。若为乘，符号标志flag置3。若为除，符号标志flag置4。

3、等于按钮：

void equ_actionPerformed(ActionEvent e) {

b = Integer.parseInt(jTextField1.getText());

switch (flag) {

case 1:

a += b;

break;

case 2:

a -= b;

break;

case 3:

a *= b;

break;

case 4:

a /= b;

break;

}

Flag= 0;

Flag 1 = 1;

jTextField1.setText(String.valueOf(a));

}

得到当前文本框内容，转换为整形，赋值给b。判断符号位，进行运算，将结果显示到文本框。

4、清零按钮

void jButton2_actionPerformed(ActionEvent e) {

jTextField1.setText("");

a = 0;

b = 0;

flag = 0;

flag1 = 0;

}

即将文本框，及所有变量置零

第二篇：java 计算器代码

/** Counter.java** Created on __DATE__, __TIME__*/package Counter;import java.awt.event.ActionEvent;/**** @author __USER__*/public class Counter extends javax.swing.JFrame {int Num1 = 0, Num2 = 0, temp = 0, temp2 = 0;enum Operation {ADD, MINUS, MULTIPLE, DIVIDE};Operation operation;boolean isToggle = false, isequal = false, isClicked = false;int result = 0;String oldText, newText;/** Creates new form Counter */public Counter() {initComponents();}//GEN-BEGIN:initComponents// <editor-fold defaultstate="collapsed" desc="Generated Code">private void initComponents() {jButtonNum2 = new javax.swing.JButton();jButtonNum3 = new javax.swing.JButton();jButtonNum4 = new javax.swing.JButton();jButtonNum5 = new javax.swing.JButton();jButtonNum6 = new javax.swing.JButton();jButtonNum7 = new javax.swing.JButton();jButtonNum8 = new javax.swing.JButton();jButtonNum9 = new javax.swing.JButton();AddjButton = new javax.swing.JButton();MinusjButton = new javax.swing.JButton();MultiplyjButton = new javax.swing.JButton();DividejButton = new javax.swing.JButton();equaljButton = new javax.swing.JButton();resultText = new javax.swing.JTextField();jButtonNum1 = new javax.swing.JButton();jButtonNum0 = new javax.swing.JButton();setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);addMouseListener(new java.awt.event.MouseAdapter() {public void mouseClicked(java.awt.event.MouseEvent evt) {formMouseClicked(evt);}});jButtonNum2.setText("2");jButtonNum2.addMouseListener(new java.awt.event.MouseAdapter() {public void mouseClicked(java.awt.event.MouseEvent evt) {jButtonNum2MouseClicked(evt);}});jButtonNum3.setText("3");jButtonNum3.addMouseListener(new java.awt.event.MouseAdapter() {public void mouseClicked(java.awt.event.MouseEvent evt) {jButtonNum3MouseClicked(evt);}});jButtonNum4.setText("4");jButtonNum4.addMouseListener(new java.awt.event.MouseAdapter() {public void mouseClicked(java.awt.event.MouseEvent evt) {jButtonNum4MouseClicked(evt);}});jButtonNum5.setText("5");jButtonNum5.addMouseListener(new java.awt.event.MouseAdapter() {public void mouseClicked(java.awt.event.MouseEvent evt) {jButtonNum5MouseClicked(evt);}});jButtonNum6.setText("6");jButtonNum6.addMouseListener(new java.awt.event.MouseAdapter() {public void mouseClicked(java.awt.event.MouseEvent evt) {jButtonNum6MouseClicked(evt);}});jButtonNum7.setText("7");jButtonNum7.addMouseListener(new java.awt.event.MouseAdapter() {public void mouseClicked(java.awt.event.MouseEvent evt) {jButtonNum7MouseClicked(evt);}});jButtonNum8.setText("8");jButtonNum8.addMouseListener(new java.awt.event.MouseAdapter() {public void mouseClicked(java.awt

.event.MouseEvent evt) {jButtonNum8MouseClicked(evt);}});jButtonNum9.setText("9");jButtonNum9.addMouseListener(new java.awt.event.MouseAdapter() {public void mouseClicked(java.awt.event.MouseEvent evt) {jButtonNum9MouseClicked(evt);}});AddjButton.setText("+");AddjButton.addMouseListener(new java.awt.event.MouseAdapter() {public void mouseClicked(java.awt.event.MouseEvent evt) {AddjButtonMouseClicked(evt);}});MinusjButton.setText("-");MinusjButton.addMouseListener(new java.awt.event.MouseAdapter() {public void mouseClicked(java.awt.event.MouseEvent evt) {MinusjButtonMouseClicked(evt);}});MultiplyjButton.setText("*");MultiplyjButton.addMouseListener(new java.awt.event.MouseAdapter() {public void mouseClicked(java.awt.event.MouseEvent evt) {MultiplyjButtonMouseClicked(evt);}});DividejButton.setText("/");DividejButton.addMouseListener(new java.awt.event.MouseAdapter() {public void mouseClicked(java.awt.event.MouseEvent evt) {DividejButtonMouseClicked(evt);}});equaljButton.setText("=");equaljButton.addMouseListener(new java.awt.event.MouseAdapter() {public void mouseClicked(java.awt.event.MouseEvent evt) {equaljButtonMouseClicked(evt);}});resultText.addActionListener(new java.awt.event.ActionListener() {public void actionPerformed(java.awt.event.ActionEvent evt) {resultTextActionPerformed(evt);}});jButtonNum1.setText("1");jButtonNum1.addMouseListener(new java.awt.event.MouseAdapter() {public void mouseClicked(java.awt.event.MouseEvent evt) {jButtonNum1MouseClicked(evt);}});jButtonNum0.setText("0");jButtonNum0.addMouseListener(new java.awt.event.MouseAdapter() {public void mouseClicked(java.awt.event.MouseEvent evt) {jButtonNum0MouseClicked(evt);}});javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());getContentPane().setLayout(layout);layout.setHorizontalGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).addGroup(layout.createSequentialGroup().addGap(64, 64, 64).addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).addComponent(resultText,javax.swing.GroupLayout.PREFERRED_SIZE,314,javax.swing.GroupLayout.PREFERRED_SIZE).addGroup(layout.createSequentialGroup().addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING,false).addGroup(la

yout.createSequentialGroup().addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING,false).addComponent(jButtonNum1).addComponent(jButtonNum7).addComponent(jButtonNum4)).addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED).addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING).addComponent(jButtonNum8).addComponent(jButtonNum5)).addComponent(jButtonNum2)).addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED).addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).addComponent(jButtonNum9).addComponent(jButtonNum6).addComponent(jButtonNum3))).addComponent(jButtonNum0,javax.swing.GroupLayout.DEFAULT_SIZE,javax.swing.GroupLayout.DEFAULT_SIZE,Short.MAX_VALUE)).addGap(64,64,64).addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).addGroup(layout.createSequentialGroup().addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED).addComponent(DividejButton).addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATE

D).addComponent(equaljButton)).addComponent(AddjButton).addComponent(MinusjButton).addComponent(MultiplyjButton)))).addGap(69, 69, 69)));layout.setVerticalGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).addGroup(layout.createSequentialGroup().addGap(24, 24, 24).addComponent(resultText,javax.swing.GroupLayout.PREFERRED_SIZE,javax.swing.GroupLayout.DEFAULT_SIZE,javax.swing.GroupLayout.PREFERRED_SIZE).addGap(28, 28, 28).addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE).addComponent(jButtonNum8).addComponent(jButtonNum7).addComponent(jButtonNum9).addComponent(AddjButton)).addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED).addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE).addComponent(jButtonNum5).addComponent(jButtonNum4).addComponent(jButtonNum6).addComponent(MinusjButton)).addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED).addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE).addComponent(jButtonNum3).addComponent(MultiplyjButton).addComponent(jButtonNum1).addComponent(jButtonNum2)).addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED).addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING).addComponent(equaljButton).addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE).addComponent(DividejButton).addComponent(jButtonNum0))).addContainerGap(113, Short.MAX_VALUE)));pack();}// </editor-fold>//GEN-END:initComponentsprivate void jButtonNum0MouseClicked(java.awt.event.MouseEvent evt) {// TODO add your handling code here:if (isequal) {temp =

0;Num2 = 0;Num1 = 0;result = 0;temp2 = 0;isequal = false;}if (isToggle) {// 把结果显示的从新写resultText.setText("0");Num2 = 0;isToggle = false;} else {oldText = resultText.getText();newText = oldText + "0";resultText.setText(newText);Num2 = Integer.parseInt(newText);}}private void DividejButtonMouseClicked(java.awt.event.MouseEvent evt) {// TODO add your handling code here:if (isequal) {temp = result;} else if (isClicked) {switch (operation) {case ADD:temp = result + Num2;break;case MINUS:temp = result - Num2;break;case MULTIPLE:temp = result * Num2;break;case DIVIDE:temp = result / Num2;break;default:break;}} else{temp =Num2;} resultText.setText(String.valueOf(temp));oldText = resultText.getText();Num1 = Integer.parseInt(oldText);Num2 = 0;result = temp;operation = Operation.DIVIDE;isToggle = true;isequal = false;isClicked = true;}private void MultiplyjButtonMouseClicked(java.awt.event.MouseEvent evt) {// TODO add your handling code here:if (isequal) {temp = result;} else if (isClicked) {switch (operation) {case ADD:temp = result + Num2;break;case MINUS:temp = result - Num2;break;case MULTIPLE:temp = result * Num2;break;case DIVIDE:temp = result / Num2;break;default:break;}} else {result = 1;temp = result * Num2;}resultText.setText(String.valueOf(temp));oldText = resultText.getText();Num1 = Integer.parseInt(oldText);Num2 = 0;result = temp;operation = Operation.MULTIPLE;isToggle = true;isequal = false;isClicked = true;}private void jButtonNum9MouseClicked(java.awt.event.MouseEvent evt) {// TODO add your handling code here:if (isequal) {temp = 0;Num2 = 0;Num1 = 0;result = 0;temp2 = 0;isequal = false;}if (isToggle) {// 把结果显示的从新写resultText.setText("9");Num2 = 9;isToggle = false;} else {oldText = resultText.getText();newText = oldText + "9";resultText.setText(newText);Num2 = Integer.parseInt(newText);}}private void jButtonNum8MouseClicked(java.awt.event.MouseEvent evt) {// TODO add your handling code here:if (isequal) {temp = 0;Num2 = 0;Num1 = 0;result = 0;temp2 = 0;isequal = false;}if (isToggle) {// 把结果显示的从新写resultText.setText("8");Num2 = 8;isToggle = false;} else {oldText = resultText.getText();newText = oldText + "8";resultText.setText(newText);Num2 = Integer.parseInt(newText);}}private void jButtonNum7MouseClicked(java.awt.event.MouseEvent evt) {// TODO add your hand

ling code here:if (isequal) {temp = 0;Num2 = 0;Num1 = 0;result = 0;temp2 = 0;isequal = false;}if (isToggle) {// 把结果显示的从新写resultText.setText("7");Num2 = 7;isToggle = false;} else {oldText = resultText.getText();newText = oldText + "7";resultText.setText(newText);Num2 = Integer.parseInt(newText);}}private void jButtonNum6MouseClicked(java.awt.event.MouseEvent evt) {// TODO add your handling code here:if (isequal) {temp = 0;Num2 = 0;Num1 = 0;result = 0;temp2 = 0;isequal = false;}if (isToggle) {// 把结果显示的从新写resultText.setText("6");Num2 = 6;isToggle = false;} else {oldText = resultText.getText();newText = oldText + "6";resultText.setText(newText);Num2 = Integer.parseInt(newText);}}private void jButtonNum5MouseClicked(java.awt.event.MouseEvent evt) {// TODO add your handling code here:if (isequal) {temp = 0;Num2 = 0;Num1 = 0;result = 0;temp2 = 0;isequal = false;}if (isToggle) {// 把结果显示的从新写resultText.setText("5");Num2 = 5;isToggle = false;} else {oldText = resultText.getText();newText = oldText + "5";resultText.setText(newText);Num2 = Integer.parseInt(newText);}}private void jButtonNum4MouseClicked(java.awt.event.MouseEvent evt) {// TODO add your handling code here:if (isequal) {temp = 0;Num2 = 0;Num1 = 0;result = 0;temp2 = 0;isequal = false;}if (isToggle) {// 把结果显示的从新写resultText.setText("4");Num2 = 4;isToggle = false;} else {oldText = resultText.getText();newText = oldText + "4";resultText.setText(newText);Num2 = Integer.parseInt(newText);}}private void jButtonNum3MouseClicked(java.awt.event.MouseEvent evt) {// TODO add your handling code here:if (isequal) {temp = 0;Num2 = 0;Num1 = 0;result = 0;temp2 = 0;isequal = false;}if (isToggle) {// 把结果显示的从新写resultText.setText("3");Num2 = 3;isToggle = false;} else {oldText = resultText.getText();newText = oldText + "3";resultText.setText(newText);Num2 = Integer.parseInt(newText);}}private void MinusjButtonMouseClicked(java.awt.event.MouseEvent evt) {// TODO add your handling code here:if (isequal) {temp = result;} else if (isClicked) {switch (operation) {case ADD:temp = result + Num2;break;case MINUS:temp = result - Num2;break;case MULTIPLE:temp = result * Num2;break;case DIVIDE:temp = result / Num2;break;default:break;}} elsetemp = Num2;resultText.setText(String.valueOf(temp));oldText = resultTex

t.getText();Num1 = Integer.parseInt(oldText);Num2 = 0;result = temp;operation = Operation.MINUS;isToggle = true;isequal = false;isClicked = true;}private void AddjButtonMouseClicked(java.awt.event.MouseEvent evt) {if (isequal) {temp = result;} else if (isClicked) {switch (operation) {case ADD:temp = result + Num2;break;case MINUS:temp = result - Num2;break;case MULTIPLE:temp = result * Num2;break;case DIVIDE:temp = result / Num2;break;default:break;}} elsetemp = result + Num2;resultText.setText(String.valueOf(temp));oldText = resultText.getText();Num1 = Integer.parseInt(oldText);Num2 = 0;result = temp;operation = Operation.ADD;isToggle = true;isequal = false;isClicked = true;}private void equaljButtonMouseClicked(java.awt.event.MouseEvent evt) {// TODO add your handling code here:if (isequal) {switch (operation) {case ADD:result = result + Num2;resultText.setText(String.valueOf(result));isToggle = true;break;case MINUS:result = result - Num2;resultText.setText(String.valueOf(result));isToggle = true;break;case MULTIPLE:result = result * Num2;resultText.setText(String.valueOf(result));isToggle = true;break;case DIVIDE:result = result / Num2;resultText.setText(String.valueOf(result));isToggle = true;break;default:break;}} else {switch (operation) {case ADD:result = temp + Num2;resultText.setText(String.valueOf(result));isToggle = true;break;case MINUS:result = temp - Num2;resultText.setText(String.valueOf(result));isToggle = true;break;case MULTIPLE:result = temp * Num2;resultText.setText(String.valueOf(result));isToggle = true;break;case DIVIDE:result = temp / Num2;resultText.setText(String.valueOf(result));isToggle = true;break;default:break;}}isequal = true;}private void jButtonNum1MouseClicked(java.awt.event.MouseEvent evt) {// TODO add your handling code here:if (isequal) {temp = 0;Num2 = 0;Num1 = 0;result = 0;temp2 = 0;isequal = false;}if (isToggle) {// 把结果显示的从新写resultText.setText("1");Num2 = 1;isToggle = false;} else {oldText = resultText.getText();newText = oldText + "1";resultText.setText(newText);Num2 = Integer.parseInt(newText);}}private void formMouseClicked(java.awt.event.MouseEvent evt) {// TODO add your handling code here:}private void jButtonNum2MouseClicked(java.awt.event.MouseEvent evt) {// TODO add your handling code here:if (isequal) {temp = 0;Num2 = 0;Num1 = 0;resul

t = 0;temp2 = 0;isequal = false;}if (isToggle) {// 把结果显示的从新写resultText.setText("2");Num2 = 2;isToggle = false;} else {oldText = resultText.getText();newText = oldText + "2";resultText.setText(newText);Num2 = Integer.parseInt(newText);}}private void resultTextActionPerformed(java.awt.event.ActionEvent evt) {// TODO add your handling code here:}/*** @param args the command line arguments*/public static void main(String args[]) {java.awt.EventQueue.invokeLater(new Runnable() {public void run() {new Counter().setVisible(true);}});}//GEN-BEGIN:variables// Variables declaration - do not modifyprivate javax.swing.JButton AddjButton;private javax.swing.JButton DividejButton;private javax.swing.JButton MinusjButton;private javax.swing.JButton MultiplyjButton;private javax.swing.JButton equaljButton;private javax.swing.JButton jButtonNum0;private javax.swing.JButton jButtonNum1;private javax.swing.JButton jButtonNum2;private javax.swing.JButton jButtonNum3;private javax.swing.JButton jButtonNum4;private javax.swing.JButton jButtonNum5;private javax.swing.JButton jButtonNum6;private javax.swing.JButton jButtonNum7;private javax.swing.JButton jButtonNum8;private javax.swing.JButton jButtonNum9;private javax.swing.JTextField resultText;// End of variables declaration//GEN-END:variables}

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java计算器实验报告（29篇）

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Java计算器实验报告(包括普通型和科学型)