/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
/**
*
* @author HP-Developer
*/
/*
* 要明确一点,我们现在不是使用计算器,而是开发计算器
* 问题处理思路如下:
* 用户操作计算器一般会输入第一个数值,然后输入运算符,然后输入第二个数值,最后点击等号显示结果
* 因此我们的程序处理过程就如下设计:
* 1. 点击数字按钮时:
更新文本框内的内容,将所点击的数字显示在文本框中
* 2. 点击运算符(+ - * /)时:
(1)代表第一个数值输入完毕,那么就获取第一个数值,并将数值赋值给变量(firstvalue)
(2)清空文本框
(3)获取运算符,并将运算符赋值给相应的变量(operation),1:加法,2:减法,3:乘法,4:除法
* 3. 点击"="时:
(1)代表第二个数值输入完毕,即将进行运算,那么就获取第二个数值,并将数值赋值给变量(secondvalue)
(2)根据operation的值,进行相应的运算(使用switch语句)
(3)将结果显示到文本框中
* 4. 点击“C”时:
(1)清空文本框的内容
(2)清空firstvalue和secondvalue的值
*/
public class Calculator extends javax.swing.JFrame {
private int operation;//计算器的成员变量(属性),存储运算符
private int firstvalue;//计算器的成员变量(属性),存储第一个数值
private int secondevalue;//计算器的成员变量(属性),存储第二个数值
//计算器类的构造函数,对运算符和窗体上的控件进行初始化。
public Calculator() {
operation = 0;
initComponents();//自动生成的代码,不用管他们
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
private void initComponents() {
outTextField = new javax.swing.JTextField();
jLabel1 = new javax.swing.JLabel();
addButton = new javax.swing.JButton();
redButton = new javax.swing.JButton();
mulButton = new javax.swing.JButton();
divButton = new javax.swing.JButton();
jButton5 = new javax.swing.JButton();
jButton6 = new javax.swing.JButton();
jButton7 = new javax.swing.JButton();
cleanButton = new javax.swing.JButton();
jButton9 = new javax.swing.JButton();
jButton10 = new javax.swing.JButton();
jButton11 = new javax.swing.JButton();
amountButton = new javax.swing.JButton();
jButton13 = new javax.swing.JButton();
jButton14 = new javax.swing.JButton();
jButton15 = new javax.swing.JButton();
jButton16 = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jLabel1.setText("结果:");
addButton.setText("+");
addButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
addButtonActionPerformed(evt);
}
});
redButton.setText("-");
redButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
redButtonActionPerformed(evt);
}
});
mulButton.setText("*");
mulButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
mulButtonActionPerformed(evt);
}
});
divButton.setText("/");
divButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
divButtonActionPerformed(evt);
}
});
jButton5.setText("7");
jButton5.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton5ActionPerformed(evt);
}
});
jButton6.setText("8");
jButton6.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton6ActionPerformed(evt);
}
});
jButton7.setText("9");
jButton7.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton7ActionPerformed(evt);
}
});
cleanButton.setText("C");
cleanButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
cleanButtonActionPerformed(evt);
}
});
jButton9.setText("4");
jButton9.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton9ActionPerformed(evt);
}
});
jButton10.setText("5");
jButton10.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton10ActionPerformed(evt);
}
});
jButton11.setText("6");
jButton11.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton11ActionPerformed(evt);
}
});
amountButton.setText("=");
amountButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
amountButtonActionPerformed(evt);
}
});
jButton13.setText("1");
jButton13.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton13ActionPerformed(evt);
}
});
jButton14.setText("2");
jButton14.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton14ActionPerformed(evt);
}
});
jButton15.setText("3");
jButton15.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton15ActionPerformed(evt);
}
});
jButton16.setText("0");
jButton16.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton16ActionPerformed(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()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(16, 16, 16)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(addButton, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton5, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton9, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton13, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(redButton, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton6, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton10, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton14, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(mulButton, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton7, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton11, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton15, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(divButton, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(cleanButton, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(amountButton, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton16, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)))
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(19, 19, 19)
.addComponent(jLabel1))
.addGroup(layout.createSequentialGroup()
.addGap(61, 61, 61)
.addComponent(outTextField, javax.swing.GroupLayout.PREFERRED_SIZE, 100, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addGap(0, 0, Short.MAX_VALUE)))
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(outTextField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(jLabel1))
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(addButton)
.addComponent(redButton)
.addComponent(mulButton)
.addComponent(divButton))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton5)
.addComponent(jButton6)
.addComponent(jButton7)
.addComponent(cleanButton))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton9)
.addComponent(jButton10)
.addComponent(jButton11)
.addComponent(amountButton))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton13)
.addComponent(jButton14)
.addComponent(jButton15)
.addComponent(jButton16))
.addContainerGap(30, Short.MAX_VALUE))
);
pack();
}// </editor-fold>//GEN-END:initComponents
/*
* 所有数字按钮的事件响应程序的处理方式一样的
*/
//点击按钮“1”
private void jButton13ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton13ActionPerformed
//获取文本框的当前值:outTextField.getText()
//在当前值后面附加一个字符“1”:outTextField.getText()+1
//将新字符串显示到文本框中
outTextField.setText(outTextField.getText()+1);
}//GEN-LAST:event_jButton13ActionPerformed
//点击按钮“2“
private void jButton14ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton14ActionPerformed
outTextField.setText(outTextField.getText()+2);
}//GEN-LAST:event_jButton14ActionPerformed
//点击按钮“3”
private void jButton15ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton15ActionPerformed
outTextField.setText(outTextField.getText()+3);
}//GEN-LAST:event_jButton15ActionPerformed
//点击按钮“0”
private void jButton16ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton16ActionPerformed
outTextField.setText(outTextField.getText()+0);
}//GEN-LAST:event_jButton16ActionPerformed
//点击按钮“4”
private void jButton9ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton9ActionPerformed
outTextField.setText(outTextField.getText()+4);
}//GEN-LAST:event_jButton9ActionPerformed
//点击按钮“5”
private void jButton10ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton10ActionPerformed
outTextField.setText(outTextField.getText()+5);
}//GEN-LAST:event_jButton10ActionPerformed
//点击按钮“6”
private void jButton11ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton11ActionPerformed
outTextField.setText(outTextField.getText()+6);
}//GEN-LAST:event_jButton11ActionPerformed
//点击按钮“=”
private void amountButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_amountButtonActionPerformed
secondevalue = Integer.parseInt(outTextField.getText());//将文本框内容转换成int数据,并赋值给secondvalue
switch(operation){//根据操作符,执行相应的操作
case 1://加法运算
{
Integer result = firstvalue +secondevalue;//求和,并赋值给result
outTextField.setText(result.toString());//将result转换成字符串,并显示在文本框中
break;
}
case 2://减法运算,过程和加法相同
{
Integer result = firstvalue -secondevalue;
outTextField.setText(result.toString());
break;
}
case 3://乘法运算,过程和加法相同
{
Integer result = firstvalue *secondevalue;
outTextField.setText(result.toString());
break;
}
case 4://除法运算,过程和加法相同
{
Integer result = firstvalue /secondevalue;
outTextField.setText(result.toString());
break;
}
default:
break;
}
}//GEN-LAST:event_amountButtonActionPerformed
//点击按钮“7”
private void jButton5ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton5ActionPerformed
outTextField.setText(outTextField.getText()+7);
}//GEN-LAST:event_jButton5ActionPerformed
//点击按钮“8”
private void jButton6ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton6ActionPerformed
outTextField.setText(outTextField.getText()+8);
}//GEN-LAST:event_jButton6ActionPerformed
//点击按钮“9”
private void jButton7ActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_jButton7ActionPerformed
outTextField.setText(outTextField.getText()+9);
}//GEN-LAST:event_jButton7ActionPerformed
// 点击按钮“C”
private void cleanButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_cleanButtonActionPerformed
//清空文本框显示
outTextField.setText("");
//清空firstvalue
firstvalue=0;
//清空secondvalue
secondevalue=0;
}//GEN-LAST:event_cleanButtonActionPerformed
//点击按钮“+”
private void addButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_addButtonActionPerformed
String firstStr = outTextField.getText();//获取文本框的内容
firstvalue = Integer.parseInt(firstStr);//将文本框的内容转换成int型数据,并赋值给firstvalue
outTextField.setText("");//清空文本框的内容
operation = 1;//将操作设置为加法,这样我们在点击按钮“=”时,将执行case 1代码段
}//GEN-LAST:event_addButtonActionPerformed
//点击按钮“-”,处理过程与“+”类似
private void redButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_redButtonActionPerformed
String firstStr = outTextField.getText();
firstvalue = Integer.parseInt(firstStr);
outTextField.setText("");
operation = 2;
}//GEN-LAST:event_redButtonActionPerformed
//点击按钮“*”,处理过程与“+”类似
private void mulButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_mulButtonActionPerformed
String firstStr = outTextField.getText();
firstvalue = Integer.parseInt(firstStr);
outTextField.setText("");
operation = 3;
}//GEN-LAST:event_mulButtonActionPerformed
//点击按钮“/”,处理过程与“+”类似
private void divButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_divButtonActionPerformed
String firstStr = outTextField.getText();
firstvalue = Integer.parseInt(firstStr);
outTextField.setText("");
operation = 4;
}//GEN-LAST:event_divButtonActionPerformed
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(Calculator.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(Calculator.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(Calculator.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(Calculator.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new Calculator().setVisible(true); //实例化一个计算器窗体,并将可见性设为true
}
});
}
//下面是窗体上的按钮,也属于成员变量
// Variables declaration - do not modify//GEN-BEGIN:variables
private javax.swing.JButton addButton;
private javax.swing.JButton amountButton;
private javax.swing.JButton cleanButton;
private javax.swing.JButton divButton;
private javax.swing.JButton jButton10;
private javax.swing.JButton jButton11;
private javax.swing.JButton jButton13;
private javax.swing.JButton jButton14;
private javax.swing.JButton jButton15;
private javax.swing.JButton jButton16;
private javax.swing.JButton jButton5;
private javax.swing.JButton jButton6;
private javax.swing.JButton jButton7;
private javax.swing.JButton jButton9;
private javax.swing.JLabel jLabel1;
private javax.swing.JButton mulButton;
private javax.swing.JTextField outTextField;
private javax.swing.JButton redButton;
// End of variables declaration//GEN-END:variables
}
计算器代码加注释版
最新推荐文章于 2021-05-22 23:15:35 发布
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