用JAVA制作一个简单计算器

Question

需求说明：写一个简单计算器程序，该计算器支持五种运算：加、减、乘、除和求余，分别用“+”、“-”、“*”、“/”及“%”表示。用户可以输入数值及运算符号，然后点击“计算”按钮，如果输入合法就会显示出计算结果，否则（例如输入了字母等等）要显示一个消息框说明输入非法。
界面要求：有三个可输入内容的本文框（分别记为T1、T2和T3）、一个不可编辑的文本框（记为T0）和一个按钮（记为B）。其中T1、T2、T3和T0排列成一行。T1和T3中接受操作数输入，T2中接受运算符输入，T0显示计算结果（如果可以计算的话）。T1、T2、T3、T0和B的具体命名请自行确定。

Answer 1

public class NewJFrame extends javax.swing.JFrame {
String temp=" ";
String single=" ";
/** Creates new form NewJFrame */
public NewJFrame() {
initComponents();
}

/** 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.
*/
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {

jTextField1 = 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();
jButton15 = new javax.swing.JButton();
jButton16 = new javax.swing.JButton();
jButton14 = new javax.swing.JButton();
jMenuBar1 = new javax.swing.JMenuBar();
jMenu1 = new javax.swing.JMenu();
jSeparator1 = new javax.swing.JSeparator();
jMenuItem1 = new javax.swing.JMenuItem();
jMenuItem7 = new javax.swing.JMenuItem();
jMenu2 = new javax.swing.JMenu();
jSeparator2 = new javax.swing.JSeparator();
jMenuItem2 = new javax.swing.JMenuItem();
jMenuItem5 = new javax.swing.JMenuItem();
jSeparator3 = new javax.swing.JSeparator();
jMenuItem6 = new javax.swing.JMenuItem();
jMenu3 = new javax.swing.JMenu();
jMenuItem3 = new javax.swing.JMenuItem();
jMenuItem4 = new javax.swing.JMenuItem();

setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

jTextField1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jTextField1ActionPerformed(evt);
}
});

jButton1.setText("7");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});

jButton2.setText("8");
jButton2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton2ActionPerformed(evt);
}
});

jButton3.setText("9");
jButton3.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton3ActionPerformed(evt);
}
});

jButton4.setText("+");
jButton4.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton4ActionPerformed(evt);
}
});

jButton5.setText("4");
jButton5.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton5ActionPerformed(evt);
}
});

jButton6.setText("5");
jButton6.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton6ActionPerformed(evt);
}
});

jButton7.setText("6");
jButton7.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton7ActionPerformed(evt);
}
});

jButton8.setText("-");
jButton8.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton8ActionPerformed(evt);
}
});

jButton9.setText("1");
jButton9.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton9ActionPerformed(evt);
}
});

jButton10.setText("2");
jButton10.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton10ActionPerformed(evt);
}
});

jButton11.setText("3");
jButton11.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton11ActionPerformed(evt);
}
});

jButton12.setText("*");
jButton12.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton12ActionPerformed(evt);
}
});

jButton13.setText("0");
jButton13.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton13ActionPerformed(evt);
}
});

jButton15.setText("c");
jButton15.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton15ActionPerformed(evt);
}
});

jButton16.setText("/");
jButton16.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton16ActionPerformed(evt);
}
});

jButton14.setText("=");
jButton14.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton14ActionPerformed(evt);
}
});

jMenu1.setText("编辑");
jMenu1.add(jSeparator1);

jMenuItem1.setAccelerator(javax.swing.KeyStroke.getKeyStroke(java.awt.event.KeyEvent.VK_C, java.awt.event.InputEvent.CTRL_MASK));
jMenuItem1.setText("复制");
jMenu1.add(jMenuItem1);

jMenuItem7.setAccelerator(javax.swing.KeyStroke.getKeyStroke(java.awt.event.KeyEvent.VK_V, java.awt.event.InputEvent.CTRL_MASK));
jMenuItem7.setText("粘贴");
jMenu1.add(jMenuItem7);

jMenuBar1.add(jMenu1);

jMenu2.setText("查看");
jMenu2.add(jSeparator2);

jMenuItem2.setText("标准型 ");
jMenu2.add(jMenuItem2);

jMenuItem5.setText("科学型");
jMenu2.add(jMenuItem5);
jMenu2.add(jSeparator3);

jMenuItem6.setText("数字分组");
jMenu2.add(jMenuItem6);

jMenuBar1.add(jMenu2);

jMenu3.setText("帮助");

jMenuItem3.setText("关于帮助");
jMenu3.add(jMenuItem3);

jMenuItem4.setText("关于计算器 ");
jMenu3.add(jMenuItem4);

jMenuBar1.add(jMenu3);

setJMenuBar(jMenuBar1);

javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jTextField1, javax.swing.GroupLayout.DEFAULT_SIZE, 400, Short.MAX_VALUE)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 60, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jButton2, javax.swing.GroupLayout.PREFERRED_SIZE, 61, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jButton3, javax.swing.GroupLayout.PREFERRED_SIZE, 61, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(jButton4, javax.swing.GroupLayout.PREFERRED_SIZE, 61, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(109, Short.MAX_VALUE))
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jButton5, javax.swing.GroupLayout.PREFERRED_SIZE, 61, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jButton6, javax.swing.GroupLayout.PREFERRED_SIZE, 61, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jButton7, javax.swing.GroupLayout.PREFERRED_SIZE, 61, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(jButton8, javax.swing.GroupLayout.PREFERRED_SIZE, 61, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(108, Short.MAX_VALUE))
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
.addGroup(javax.swing.GroupLayout.Alignment.LEADING, layout.createSequentialGroup()
.addComponent(jButton13, javax.swing.GroupLayout.PREFERRED_SIZE, 61, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jButton15, javax.swing.GroupLayout.PREFERRED_SIZE, 61, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(jButton14, javax.swing.GroupLayout.PREFERRED_SIZE, 61, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jButton16, javax.swing.GroupLayout.PREFERRED_SIZE, 61, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(javax.swing.GroupLayout.Alignment.LEADING, layout.createSequentialGroup()
.addComponent(jButton9, javax.swing.GroupLayout.PREFERRED_SIZE, 61, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jButton10, javax.swing.GroupLayout.PREFERRED_SIZE, 61, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(18, 18, 18)
.addComponent(jButton11, javax.swing.GroupLayout.PREFERRED_SIZE, 61, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jButton12, javax.swing.GroupLayout.PREFERRED_SIZE, 61, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addContainerGap(108, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton1)
.addComponent(jButton2)
.addComponent(jButton3)
.addComponent(jButton4))
.addGap(28, 28, 28)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton5)
.addComponent(jButton6)
.addComponent(jButton7)
.addComponent(jButton8))
.addGap(35, 35, 35)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton9)
.addComponent(jButton10)
.addComponent(jButton11)
.addComponent(jButton12))
.addGap(29, 29, 29)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jButton13)
.addComponent(jButton15)
.addComponent(jButton16)
.addComponent(jButton14))
.addContainerGap(64, Short.MAX_VALUE))
);

pack();
}// </editor-fold>

private void jTextField1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:

}

private void jButton3ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
jTextField1.setText(jTextField1.getText()+"9");
}

private void jButton15ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
jTextField1.setText("");
}

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
jTextField1.setText(jTextField1.getText()+"7");

}

private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
jTextField1.setText(jTextField1.getText()+"8");
}

private void jButton5ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
jTextField1.setText(jTextField1.getText()+"4");
}

private void jButton6ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
jTextField1.setText(jTextField1.getText()+"5");
}

private void jButton7ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
jTextField1.setText(jTextField1.getText()+"6");
}

private void jButton9ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
jTextField1.setText(jTextField1.getText()+"1");
}

private void jButton10ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
jTextField1.setText(jTextField1.getText()+"2");
}

private void jButton11ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
jTextField1.setText(jTextField1.getText()+"3");
}

private void jButton13ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
jTextField1.setText(jTextField1.getText()+"0");
}

private void jButton4ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:

temp=jTextField1.getText();
single="+";
jTextField1.setText("");

}

private void jButton8ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
temp=jTextField1.getText();
single="-";
jTextField1.setText("");
}

private void jButton12ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
temp=jTextField1.getText();
single="*";
jTextField1.setText("");
}

private void jButton16ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
temp=jTextField1.getText();
single="/";
jTextField1.setText("");
}

private void jButton14ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
if(single=="+")

jTextField1.setText(" "+(Double.parseDouble(jTextField1.getText())+Double.parseDouble(temp)));
if(single=="*")
jTextField1.setText(" "+Double.parseDouble(jTextField1.getText())*Double.parseDouble(temp));
if(single=="-")
jTextField1.setText(" "+(Double.parseDouble(temp)-Double.parseDouble(jTextField1.getText())));
if(single=="/")
jTextField1.setText(" "+(Double.parseDouble(temp)/Double.parseDouble(jTextField1.getText())));

}

/**
* @param args the command line arguments
*/
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new NewJFrame().setVisible(true);
}
});
}

// Variables declaration - do not modify
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 jButton15;
private javax.swing.JButton jButton16;
private javax.swing.JButton jButton2;
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.JMenu jMenu1;
private javax.swing.JMenu jMenu2;
private javax.swing.JMenu jMenu3;
private javax.swing.JMenuBar jMenuBar1;
private javax.swing.JMenuItem jMenuItem1;
private javax.swing.JMenuItem jMenuItem2;
private javax.swing.JMenuItem jMenuItem3;
private javax.swing.JMenuItem jMenuItem4;
private javax.swing.JMenuItem jMenuItem5;
private javax.swing.JMenuItem jMenuItem6;
private javax.swing.JMenuItem jMenuItem7;
private javax.swing.JSeparator jSeparator1;
private javax.swing.JSeparator jSeparator2;
private javax.swing.JSeparator jSeparator3;
private javax.swing.JTextField jTextField1;
// End of variables declaration

}

Answer 2

以前写了一个，没有％运算，你自己改改吧//Caculate2.java
import java.awt.*;
import java.awt.event.*;
public class Caculate2 extends Frame implements ActionListener,TextListener
{
static Caculate2 f=new Caculate2();
static TextArea tf1=new TextArea("0.0",1,10);
static TextArea tf2=new TextArea("0.0",1,10);
static TextArea tf3=new TextArea("0.0",1,10);
static Button a1=new Button("+");
static Button a2=new Button("-");
static Button a3=new Button("*");
static Button a4=new Button("/");
static double t1;
static double t2;

public static void main(String[] args){

a1.addActionListener(f);
a2.addActionListener(f);
a3.addActionListener(f);
a4.addActionListener(f);
tf1.addTextListener(f);
tf2.addTextListener(f);
f.setTitle("wmm");
f.setLayout(new FlowLayout(FlowLayout.CENTER));

f.setSize(250,250);
f.setLocation(250,250);
f.add(tf1);
f.add(tf2);
f.add(tf3);
f.add(a1);
f.add(a2);
f.add(a3);
f.add(a4);

f.setVisible(true);

}
public void textValueChanged(TextEvent e){

}

public void actionPerformed(ActionEvent e)
{
Button b=(Button)e.getSource();
String s1=tf1.getText();
String s2=tf2.getText();
t1=Double.parseDouble(s1);
t2=Double.parseDouble(s2);
String b1=String.valueOf(t1+t2);
String b2=String.valueOf(t1-t2);
String b3=String.valueOf(t1*t2);
String b4=String.valueOf(t1/t2);

if(b==a1)
tf3.setText(b1);
else if(b==a2)
tf3.setText(b2);
else if(b==a3)
tf3.setText(b3);
else if(b==a4)
tf3.setText(b4);
}

}

Answer 3

汗!好简单的东西.这个还需要用JAVA写吗?直接用JS写就行了!本回答被提问者采纳

Answer 4

这个貌似简易不知道要多简易的啊
。。如果就是加减乘除的话。那是非常容易的。。。很快搞定的。。。稍微简单的网上的源码也一大堆。。。你可以自己看啊。。

Answer 5

楼上的也太复杂了一点吧