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用java编写计算器篇1:用Java编写计算器的几种常见的做法
方法一：
package wanwa;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Calculator extends JFrame {
private Container container;
private GridBagLayout layout;
private GridBagConstraints constraints;
private JTextField displayField;// 计算结果显示区
private String lastCommand;// 保存+,-,*,/,=命令
private double result;// 保存计算结果
private boolean start;// 判断是否为数字的开始
public Calculator() {
super("Calculator");
container = getContentPane();
layout = new GridBagLayout();
container.setLayout(layout);
constraints = new GridBagConstraints();
start = true;
result = 0;
lastCommand = "=";
displayField = new JTextField(20);
displayField.setHorizontalAlignment(JTextField.RIGHT);
constraints.gridx = 0;
constraints.gridy = 0;
constraints.gridwidth = 4;
constraints.gridheight = 1;
constraints.fill = GridBagConstraints.BOTH;
constraints.weightx = 100;
constraints.weighty = 100;
layout.setConstraints(displayField, constraints);
container.add(displayField);
ActionListener insert = new InsertAction();
ActionListener command = new CommandAction();
// addButton("Backspace", 0, 1, 2, 1, insert);
// addButton("CE", 2, 1, 1, 1, insert);
// addButton("C", 3, 1, 1, 1, insert);
addButton("7", 0, 2, 1, 1, insert);
addButton("8", 1, 2, 1, 1, insert);
addButton("9", 2, 2, 1, 1, insert);
addButton("/", 3, 2, 1, 1, command);
addButton("4", 0, 3, 1, 1, insert);
addButton("5", 1, 3, 1, 1, insert);
addButton("6", 2, 3, 1, 1, insert);
addButton("*", 3, 3, 1, 1, command);
addButton("1", 0, 4, 1, 1, insert);
addButton("2", 1, 4, 1, 1, insert);
addButton("3", 2, 4, 1, 1, insert);
addButton("-", 3, 4, 1, 1, command);
addButton("0", 0, 5, 1, 1, insert);
// addButton("+/-", 1, 5, 1, 1, insert);// 只显示"-"号,"+"没有实用价值
addButton(".", 2, 5, 1, 1, insert);
addButton("+", 3, 5, 1, 1, command);
addButton("=", 0, 6, 4, 1, command);
this.setResizable(false);
setSize(180, 200);
setVisible(true);
}
private void addButton(String label, int row, int column, int with,
int height, ActionListener listener) {
JButton button = new JButton(label);
constraints.gridx = row;
constraints.gridy = column;
constraints.gridwidth = with;
constraints.gridheight = height;
constraints.fill = GridBagConstraints.BOTH;
button.addActionListener(listener);
layout.setConstraints(button, constraints);
container.add(button);
}
private class InsertAction implements ActionListener {
public void actionPerformed(ActionEvent event) {
String input = event.getActionCommand();
if (start) {
displayField.setText("");
start = false;
if (input.equals("+/-"))
displayField.setText(displayField.getText() + "-");
}
if (!input.equals("+/-")) {
if (input.equals("Backspace")) {
String str = displayField.getText();
if (str.length() > 0)
displayField.setText(str.substring(0, str.length() - 1));
} else if (input.equals("CE") || input.equals("C")) {
displayField.setText("0");
start = true;
} else
displayField.setText(displayField.getText() + input);
}
}
}
private class CommandAction implements ActionListener {
public void actionPerformed(ActionEvent evt) {
String command = evt.getActionCommand();
if (start) {
lastCommand = command;
} else {
calculate(Double.parseDouble(displayField.getText()));
lastCommand = command;
start = true;
}
}
}
public void calculate(double x) {
if (lastCommand.equals("+"))
result += x;
else if (lastCommand.equals("-"))
result -= x;
else if (lastCommand.equals("*"))
result *= x;
else if (lastCommand.equals("/"))
result /= x;
else if (lastCommand.equals("="))
result = x;
displayField.setText("" + result);
}
public static void main(String[] args) {
Calculator calculator = new Calculator();
calculator.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}
方法二：
import java.awt.*;
import java.awt.event.*;
public class MyCalculator{
PRivate Frame f;
private TextField tf = new TextField(30);
private long result;
private boolean append=false;
private char Operator="=";
private Button[] btn=new Button[15];
public MyCalculator() {
initComponent();
}
private void initComponent() {
f = new Frame("My Calculator V1.0");
f.setLayout(new BorderLayout()); //The frame uses BorderLayout
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent evt) {
System.exit(0);
}
});
Panel centerPanel = new Panel();
centerPanel.setLayout(new GridLayout(5, 3)); //The panel uses GridLayout
NumberListener nl=new NumberListener();
OperatorListener ol=new OperatorListener();
btn[10]=new Button("+");
btn[11]=new Button("-");
btn[12]=new Button("*");
btn[13]=new Button("/");
btn[14]=new Button("=");
for (int i=0;i<=9;i++){
btn[i]=new Button(String.valueOf(i));
centerPanel.add(btn[i]);
btn[i].addActionListener(nl);
if (i%2==1){
centerPanel.add(btn[(i+19)/2]);
btn[(i+19)/2].addActionListener(ol);
}
}
f.add(centerPanel, BorderLayout.CENTER);
Panel northPanel = new Panel();
tf.setEditable(false);
northPanel.add(tf);
f.add(northPanel, BorderLayout.NORTH);
}
public void go() {
f.pack();
f.setVisible(true);
}
public static void main(String[] args) {
new MyCalculator().go();
}
/**
*采用成员内部类方式，实现监听器接口，方便访问主类内类内部成员。
*此类负责数字按钮Action事件监听和处理
*/
class NumberListener implements ActionListener{
public void actionPerformed(ActionEvent e){
if (!append) {
tf.setText("");
append=true;
}
String s=tf.getText();
s+=e.getActionCommand();
tf.setText(s);
if (!btn[10].isEnabled()){
for(int i=10;i<=14;i++) btn[i].setEnabled(true);
}
}
}
/**
* 成员内部类，负责操作符按钮的事件处理
*/
class OperatorListener implements ActionListener{
public void actionPerformed(ActionEvent e){
if (!append) return;
for(int i=10;i<=14;i++) btn[i].setEnabled(false);
String s=tf.getText();
long num=Long.parseLong(s);//get the number of textfield
append=false;//set append
switch(operator){
case "+":result+=num;break;
case "-":result-=num;break;
case "*":result*=num;break;
case "/":{
if (num==0) result=0;
else result/=num;
break;
}
case "=":result=num;break;
}
tf.setText(String.valueOf(result));
//set the value of result to textfield
String op=e.getActionCommand();
operator=op.charAt(0); // set operator
}
}
}
方法三：
package wanwa;
import java.util.*;
public class calc {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.println("*****************简易计算器****************");
System.out.println("*\t\t\t\t\t*");
System.out.println("* 使用说明： 1.加法2.减法3.乘法4.除法 *");
System.out.println("*\t\t\t\t\t*");
System.out.println("*****************************************");
for(int i=0;i<100;i++){
System.out.print("\n请选择运算规则：");
int num = input.nextInt();
switch(num){
case 1:
System.out.println("\n******你选择了加法******\n");
System.out.print("请输入第1个加数:");
int jiashu1 = input.nextInt();
System.out.print("请输入第2个加数:");
int jiashu2 = input.nextInt();
System.out.println("运算结果为:" + jiashu1 + " + " + jiashu1 + " = " + (jiashu1 + jiashu2));
break;
case 2:
System.out.println("\n******你选择了减法******\n");
System.out.print("请输入被减数:");
int jianshu1 = input.nextInt();
System.out.print("请输入减数:");
int jianshu2 = input.nextInt();
System.out.println("运算结果为:" + jianshu1 + " - " + jianshu2 + " = " + (jianshu1 - jianshu2));
break;
case 3:
System.out.println("\n******你选择了乘法******\n");
System.out.print("请输入第1个因数:");
int chengfa1 = input.nextInt();
System.out.print("请输入第2个因数:");
int chengfa2 = input.nextInt();
System.out.println("运算结果为:" + chengfa1 + " * " + chengfa2 + " = " + (chengfa1 * chengfa2));
break;
case 4:
System.out.println("\n******你选择了除法******\n");
System.out.print("请输入被除数:");
double chufa1 = input.nextInt();
System.out.print("请输入除数:");
double chufa2 = input.nextInt();
System.out.println("运算结果为:" + chufa1 + " / " + chufa2 + " = " + (chufa1 / chufa2) + " 余 " + (chufa1 % chufa2));
break;
default:
System.out.println("\n你的选择有错，请重新选择!");
break;
}
}
}
}
方法四：
package wanwa;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Calculator extends JFrame {
private Container container;
private GridBagLayout layout;
private GridBagConstraints constraints;
private JTextField displayField;// 计算结果显示区
private String lastCommand;// 保存+,-,*,/,=命令
private double result;// 保存计算结果
private boolean start;// 判断是否为数字的开始
public Calculator() {
super("Calculator");
container = getContentPane();
layout = new GridBagLayout();
container.setLayout(layout);
constraints = new GridBagConstraints();
start = true;
result = 0;
lastCommand = "=";
displayField = new JTextField(20);
displayField.setHorizontalAlignment(JTextField.RIGHT);
constraints.gridx = 0;
constraints.gridy = 0;
constraints.gridwidth = 4;
constraints.gridheight = 1;
constraints.fill = GridBagConstraints.BOTH;
constraints.weightx = 100;
constraints.weighty = 100;
layout.setConstraints(displayField, constraints);
container.add(displayField);
ActionListener insert = new InsertAction();
ActionListener command = new CommandAction();
// addButton("Backspace", 0, 1, 2, 1, insert);
// addButton("CE", 2, 1, 1, 1, insert);
// addButton("C", 3, 1, 1, 1, insert);
addButton("7", 0, 2, 1, 1, insert);
addButton("8", 1, 2, 1, 1, insert);
addButton("9", 2, 2, 1, 1, insert);
addButton("/", 3, 2, 1, 1, command);
addButton("4", 0, 3, 1, 1, insert);
addButton("5", 1, 3, 1, 1, insert);
addButton("6", 2, 3, 1, 1, insert);
addButton("*", 3, 3, 1, 1, command);
addButton("1", 0, 4, 1, 1, insert);
addButton("2", 1, 4, 1, 1, insert);
addButton("3", 2, 4, 1, 1, insert);
addButton("-", 3, 4, 1, 1, command);
addButton("0", 0, 5, 1, 1, insert);
// addButton("+/-", 1, 5, 1, 1, insert);// 只显示"-"号,"+"没有实用价值
addButton(".", 2, 5, 1, 1, insert);
addButton("+", 3, 5, 1, 1, command);
addButton("=", 0, 6, 4, 1, command);
this.setResizable(false);
setSize(180, 200);
setVisible(true);
}
private void addButton(String label, int row, int column, int with,
int height, ActionListener listener) {
JButton button = new JButton(label);
constraints.gridx = row;
constraints.gridy = column;
constraints.gridwidth = with;
constraints.gridheight = height;
constraints.fill = GridBagConstraints.BOTH;
button.addActionListener(listener);
layout.setConstraints(button, constraints);
container.add(button);
}
private class InsertAction implements ActionListener {
public void actionPerformed(ActionEvent event) {
String input = event.getActionCommand();
if (start) {
displayField.setText("");
start = false;
if (input.equals("+/-"))
displayField.setText(displayField.getText() + "-");
}
if (!input.equals("+/-")) {
if (input.equals("Backspace")) {
String str = displayField.getText();
if (str.length() > 0)
displayField.setText(str.substring(0, str.length() - 1));
} else if (input.equals("CE") || input.equals("C")) {
displayField.setText("0");
start = true;
} else
displayField.setText(displayField.getText() + input);
}
}
}
private class CommandAction implements ActionListener {
public void actionPerformed(ActionEvent evt) {
String command = evt.getActionCommand();
if (start) {
lastCommand = command;
} else {
calculate(Double.parseDouble(displayField.getText()));
lastCommand = command;
start = true;
}
}
}
public void calculate(double x) {
if (lastCommand.equals("+"))
result += x;
else if (lastCommand.equals("-"))
result -= x;
else if (lastCommand.equals("*"))
result *= x;
else if (lastCommand.equals("/"))
result /= x;
else if (lastCommand.equals("="))
result = x;
displayField.setText("" + result);
}
public static void main(String[] args) {
Calculator calculator = new Calculator();
calculator.setDefaultCloSEOperation(JFrame.EXIT_ON_CLOSE);
}
}
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用java编写计算器篇2:java计算器代码
import java.awt.*; import java.awt.event.*; import java.lang.*; import javax.swing.*; public class Counter extends Frame { //声明三个面板的布局 GridLayout gl1,gl2,gl3; Panel p0,p1,p2,p3; JTextField tf1; TextField tf2; Button b0,b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11,b12,b13,b14,b15,b16,b17,b18,b19,b20,b21,b22,b23,b24,b25,b26; StringBuffer str;//显示屏所显示的字符串 double x,y;//x和y都是运算数 int z;//Z表示单击了那一个运算符.0表示"+",1表示"-",2表示"*",3表示"/" static double m;//记忆的数字 public Counter() { gl1=new GridLayout(1,4,10,0);//实例化三个面板的布局 gl2=new GridLayout(4,1,0,15); gl3=new GridLayout(4,5,10,15); tf1=new JTextField(27);//显示屏 tf1.setHorizontalAlignment(JTextField.RIGHT); tf1.setEnabled(false); tf1.setText("0"); tf2=new TextField(10);//显示记忆的索引值 tf2.setEditable(false); //实例化所有按钮、设置其前景色并注册监听器 b0=new Button("Backspace"); b0.setForeground(Color.red); b0.addActionListener(new Bt()); b1=new Button("CE"); b1.setForeground(Color.red); b1.addActionListener(new Bt()); b2=new Button("C"); b2.setForeground(Color.red); b2.addActionListener(new Bt()); b3=new Button("MC"); b3.setForeground(Color.red); b3.addActionListener(new Bt()); b4=new Button("MR"); b4.setForeground(Color.red); b4.addActionListener(new Bt()); b5=new Button("MS"); b5.setForeground(Color.red); b5.addActionListener(new Bt()); b6=new Button("M+"); b6.setForeground(Color.red); b6.addActionListener(new Bt()); b7=new Button("7"); b7.setForeground(Color.blue); b7.addActionListener(new Bt()); b8=new Button("8"); b8.setForeground(Color.blue); b8.addActionListener(new Bt()); b9=new Button("9"); b9.setForeground(Color.blue); b9.addActionListener(new Bt()); b10=new Button("/"); b10.setForeground(Color.red); b10.addActionListener(new Bt()); b11=new Button("sqrt"); b11.setForeground(Color.blue); b11.addActionListener(new Bt()); b12=new Button("4"); b12.setForeground(Color.blue); b12.addActionListener(new Bt()); b13=new Button("5"); b13.setForeground(Color.blue); b13.addActionListener(new Bt()); b14=new Button("6"); b14.setForeground(Color.blue); b14.addActionListener(new Bt()); b15=new Button("*"); b15.setForeground(Color.red); b15.addActionListener(new Bt()); b16=new Button("%"); b16.setForeground(Color.blue); b16.addActionListener(new Bt()); b17=new Button("1"); b17.setForeground(Color.blue); b17.addActionListener(new Bt()); b18=new Button("2"); b18.setForeground(Color.blue); b18.addActionListener(new Bt()); b19=new Button("3"); b19.setForeground(Color.blue); b19.addActionListener(new Bt()); b20=new Button("-"); b20.setForeground(Color.red); b20.addActionListener(new Bt()); b21=new Button("1/X"); b21.setForeground(Color.blue); b21.addActionListener(new Bt()); b22=new Button("0"); b22.setForeground(Color.blue); b22.addActionListener(new Bt()); b23=new Button("+/-"); b23.setForeground(Color.blue); b23.addActionListener(new Bt()); b24=new Button("."); b24.setForeground(Color.blue); b24.addActionListener(new Bt()); b25=new Button("+"); b25.setForeground(Color.red); b25.addActionListener(new Bt()); b26=new Button("="); b26.setForeground(Color.red); b26.addActionListener(new Bt()); //实例化四个面板 p0=new Panel(); p1=new Panel(); p2=new Panel(); p3=new Panel(); //创建一个空字符串缓冲区 str=new StringBuffer(); //添加面板p0中的组件和设置其在框架中的位置和大小 p0.add(tf1); p0.setBounds(10,25,300,40); //添加面板p1中的组件和设置其在框架中的位置和大小 p1.setLayout(gl1); p1.add(tf2); p1.add(b0); p1.add(b1); p1.add(b2); p1.setBounds(10,65,300,25); //添加面板p2中的组件并设置其的框架中的位置和大小 p2.setLayout(gl2); p2.add(b3); p2.add(b4); p2.add(b5); p2.add(b6); p2.setBounds(10,110,40,150); //添加面板p3中的组件并设置其在框架中的位置和大小 p3.setLayout(gl3);//设置p3的布局 p3.add(b7); p3.add(b8); p3.add(b9); p3.add(b10); p3.add(b11); p3.add(b12); p3.add(b13); p3.add(b14); p3.add(b15); p3.add(b16); p3.add(b17); p3.add(b18); p3.add(b19); p3.add(b20); p3.add(b21); p3.add(b22); p3.add(b23); p3.add(b24); p3.add(b25); p3.add(b26); p3.setBounds(60,110,250,150); //设置框架中的布局为空布局并添加4个面板 setLayout(null); add(p0); add(p1); add(p2); add(p3); setResizable(false);//禁止调整框架的大小 //匿名类关闭窗口 addWindowListener(new WindowAdapter(){ public void windowClosing(WindowEvent e1) { System.exit(0); } }); setBackground(Color.lightGray); setBounds(100,100,320,280); setVisible(true); } //构造监听器 class Bt implements ActionListener { public void actionPerformed(ActionEvent e2) { try{ if(e2.getSource()==b1)//选择"CE"清零 { tf1.setText("0");//把显示屏清零 str.setLength(0);//清空字符串缓冲区以准备接收新的输入运算数 } else if(e2.getSource()==b2)//选择"C"清零 { tf1.setText("0");//把显示屏清零 str.setLength(0); } else if(e2.getSource()==b23)//单击"+/-"选择输入的运算数是正数还是负数 { x=Double.parseDouble(tf1.getText().trim()); tf1.setText(""+(-x)); } else if(e2.getSource()==b25)//单击加号按钮获得x的值和z的值并清空y的值 { x=Double.parseDouble(tf1.getText().trim()); str.setLength(0);//清空缓冲区以便接收新的另一个运算数 y=0d; z=0; } else if(e2.getSource()==b20)//单击减号按钮获得x的值和z的值并清空y的值 { x=Double.parseDouble(tf1.getText().trim()); str.setLength(0); y=0d; z=1; } else if(e2.getSource()==b15)//单击乘号按钮获得x的值和z的值并清空y的值 { x=Double.parseDouble(tf1.getText().trim()); str.setLength(0); y=0d; z=2; } else if(e2.getSource()==b10)//单击除号按钮获得x的值和z的值并空y的值 { x=Double.parseDouble(tf1.getText().trim()); str.setLength(0); y=0d; z=3; } else if(e2.getSource()==b26)//单击等号按钮输出计算结果 { str.setLength(0); switch(z) { case 0 : tf1.setText(""+(x+y));break; case 1 : tf1.setText(""+(x-y));break; case 2 : tf1.setText(""+(x*y));break; case 3 : tf1.setText(""+(x/y));break; } } else if(e2.getSource()==b24)//单击"."按钮输入小数 { if(tf1.getText().trim().indexOf(".")!=-1)//判断字符串中是否已经包含了小数点 { } else//如果没数点有小 { if(tf1.getText().trim().equals("0"))//如果初时显示为0 { str.setLength(0); tf1.setText((str.append("0"+e2.getActionCommand())).toString()); } else if(tf1.getText().trim().equals(""))//如果初时显示为空则不做任何操作 { } else { tf1.setText(str.append(e2.getActionCommand()).toString()); } } y=0d; } else if(e2.getSource()==b11)//求平方根 { x=Double.parseDouble(tf1.getText().trim()); tf1.setText("数字格式异常"); if(x<0) tf1.setText("负数没有平方根"); else tf1.setText(""+Math.sqrt(x)); str.setLength(0); y=0d; } else if(e2.getSource()==b16)//单击了"%"按钮 { x=Double.parseDouble(tf1.getText().trim()); tf1.setText(""+(0.01*x)); str.setLength(0); y=0d; } else if(e2.getSource()==b21)//单击了"1/X"按钮 { x=Double.parseDouble(tf1.getText().trim()); if(x==0) { tf1.setText("除数不能为零"); } else { tf1.setText(""+(1/x)); } str.setLength(0); y=0d; } else if(e2.getSource()==b3)//MC为清除内存 { m=0d; tf2.setText(""); str.setLength(0); } else if(e2.getSource()==b4)//MR为重新调用存储的数据 { if(tf2.getText().trim()!="")//有记忆数字 { tf1.setText(""+m); } } else if(e2.getSource()==b5)//MS为存储显示的数据 { m=Double.parseDouble(tf1.getText().trim()); tf2.setText("M"); tf1.setText("0"); str.setLength(0); } else if(e2.getSource()==b6)//M+为将显示的数字与已经存储的数据相加要查看新的数字单击MR { m=m+Double.parseDouble(tf1.getText().trim()); } else//选择的是其他的按钮 { if(e2.getSource()==b22)//如果选择的是"0"这个数字键 { if(tf1.getText().trim().equals("0"))//如果显示屏显示的为零不做操作 { } else { tf1.setText(str.append(e2.getActionCommand()).toString()); y=Double.parseDouble(tf1.getText().trim()); } } else if(e2.getSource()==b0)//选择的是“BackSpace”按钮 { if(!tf1.getText().trim().equals("0"))//如果显示屏显示的不是零 { if(str.length()!=1) { tf1.setText(str.delete(str.length()-1,str.length()).toString());//可能抛出字符串越界异常 } else { tf1.setText("0"); str.setLength(0); } } y=Double.parseDouble(tf1.getText().trim()); } else//其他的数字键 { tf1.setText(str.append(e2.getActionCommand()).toString()); y=Double.parseDouble(tf1.getText().trim()); } } } catch(NumberFormatException e){ tf1.setText("数字格式异常"); } catch(StringIndexOutOfBoundsException e){ tf1.setText("字符串索引越界"); } } } public static void main(String args[]) { new Counter(); } }
用java编写计算器篇3:VB+易语言简单编写计算器语音教程
VB+易语言简单编写计算器语音教程网址收藏夹 http://www.ismarry.com这节课要学习的是 VB与易语言简单编写计算器 同
详细介绍VB与易语言的一些相同之处进阶学习--更容易掌握基础首先打开网址收藏夹易语言同VB,我们先添加组件.然后修改组件标题.由于是语音教程,大家看操作.且英文名称：and如果英文名称：if到数值英文名称：val或英文名称：or信息框英文名称：MsgBoxVB不等于
<>简单的计算器 就演示完成了用易语言打基础 然后去学习VB 易语言--VB--1.JAVA
2.VC++
