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import java.util.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.applet.*;
public class SZJSQ extends JApplet implements ActionListener
{
boolean i=true;
private JButton num0=new JButton("0");
private JButton num1=new JButton("1");
private JButton num2=new JButton("2");
private JButton num3=new JButton("3");
private JButton num4=new JButton("4");
private JButton num5=new JButton("5");
private JButton num6=new JButton("6");
private JButton num7=new JButton("7");
private JButton num8=new JButton("8");
private JButton num9=new JButton("9");
private JButton zuok=new JButton("(");
private JButton youk=new JButton(")");
private JButton dian=new JButton(".");
private JButton NULL=new JButton("N");
private JButton plu=new JButton("+");
private JButton min=new JButton("-");
private JButton mul=new JButton("x");
private JButton div=new JButton("/");
private JButton equ=new JButton("=");
private JButton cle=new JButton("C");//清除
private JTextField space=new JTextField(30);
public void init()
{
JPanel text=new JPanel();
text.setLayout(new FlowLayout());
text.add(space);
JPanel buttons=new JPanel();
buttons.setLayout(new GridLayout(5,4));
buttons.add(num9);
buttons.add(num8);
buttons.add(num7);
buttons.add(plu);
buttons.add(num6);
buttons.add(num5);
buttons.add(num4);
buttons.add(min);
buttons.add(num3);
buttons.add(num2);
buttons.add(num1);
buttons.add(mul);
buttons.add(num0);
buttons.add(cle);
buttons.add(equ);
buttons.add(div);
buttons.add(zuok);
buttons.add(youk);
buttons.add(dian);
buttons.add(NULL);
(num9).addActionListener(this);
(num8).addActionListener(this);
(num7).addActionListener(this);
(num6).addActionListener(this);
(num5).addActionListener(this);
(num4).addActionListener(this);
(num3).addActionListener(this);
(num2).addActionListener(this);
(num1).addActionListener(this);
(num0).addActionListener(this);
(plu).addActionListener(this);
(min).addActionListener(this);
(mul).addActionListener(this);
(div).addActionListener(this);
(equ).addActionListener(this);
(cle).addActionListener(this);
(zuok).addActionListener(this);
(youk).addActionListener(this);
(dian).addActionListener(this);
setLayout(new BorderLayout());
add("North",text);
add("South",buttons);
space.setText("0");
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==num9)
{
if(i==true)
{
space.setText("9");
i=false;
}
else space.setText(space.getText()+'9');
}
if(e.getSource()==num8)
{
if(i==true)
{
space.setText("8");
i=false;
}
else space.setText(space.getText()+'8');
}
if(e.getSource()==num7)
{
if(i==true)
{
space.setText("7");
i=false;
}
else space.setText(space.getText()+'7');
}
if(e.getSource()==num6)
{
if(i==true)
{
space.setText("6");
i=false;
}
else space.setText(space.getText()+'6');
}
if(e.getSource()==num5)
{
if(i==true)
{
space.setText("5");
i=false;
}
else space.setText(space.getText()+'5');
}
if(e.getSource()==num4)
{
if(i==true)
{
space.setText("4");
i=false;
}
else space.setText(space.getText()+'4');
}
if(e.getSource()==num3)
{
if(i==true)
{
space.setText("3");
i=false;
}
else space.setText(space.getText()+'3');
}
if(e.getSource()==num2)
{
if(i==true)
{
space.setText("2");
i=false;
}
else space.setText(space.getText()+'2');
}
if(e.getSource()==num1)
{
if(i==true)
{
space.setText("1");
i=false;
}
else space.setText(space.getText()+'1');
}
if(e.getSource()==num0)
{
if(i==true)
{
space.setText("0");
i=false;
}
else space.setText(space.getText()+'0');
}
if(e.getSource()==zuok)
{
if(i==true)
{
space.setText("(");
i=false;
}
else space.setText(space.getText()+'(');
} if(e.getSource()==youk)
{
if(i==false)
space.setText(space.getText()+')');
}
if(e.getSource()==dian)
{
if(i==false)
space.setText(space.getText()+'.');
}
if(e.getSource()==plu)
{
space.setText(space.getText()+'+');
i=false;
}
if(e.getSource()==min)
{
space.setText(space.getText()+'-');
i=false;
}
if(e.getSource()==mul)
{
space.setText(space.getText()+'*');
i=false;
}
if(e.getSource()==div)
{
space.setText(space.getText()+'/');
i=false;
}
if(e.getSource()==equ)
{
space.setText(String.valueOf(Calculator(space.getText())));
i=true;
}
if(e.getSource()==cle)
{
space.setText("0");
i=true;
}
}
public double Calculator(String f)//科学计算
{
int i=0,j=0,k;
char c;
StringBuffer s=new StringBuffer();
s.append(f);
s.append('=');
String formula=s.toString();
char[] anArray;
anArray=new char[50];
StackCharacter mystack=new StackCharacter();
while(formula.charAt(i)!='=')
{
c=formula.charAt(i);
switch(c)
{
case '(': mystack.push(new Character(c));
i++;
break;
case ')':
while(mystack.peek().charValue()!='(')
{
anArray[j++]=mystack.pop().charValue();
}
mystack.pop();
i++;
break;
case '+':
case '-':
while(!mystack.empty()mystack.peek().charValue()!='(')
{
anArray[j++]=mystack.pop().charValue();
}
mystack.push(new Character(c));
i++;
break;
case '*':
case '/':
while(!mystack.empty()(mystack.peek().charValue()=='*'||mystack.peek().charValue()=='/'))
{
anArray[j++]=mystack.pop().charValue();
}
mystack.push(new Character(c));
i++;
break;
case' ': i++;
break;
default: while((c='0'c='9')||c=='.')
{
anArray[j++]=c;
i++;
c=formula.charAt(i);
}
anArray[j++]='#';
break;
}
}
while(!(mystack.empty()))
anArray[j++]=mystack.pop().charValue();
i=0;
int count;
double a,b,d;
StackDouble mystack1 =new StackDouble();
while(ij)
{
c=anArray[i];
switch(c)
{
case '+':
a=mystack1.pop().doubleValue();
b=mystack1.pop().doubleValue();
d=b+a;
mystack1.push(new Double(d));
i++;
break;
case '-':
a=mystack1.pop().doubleValue();
b=mystack1.pop().doubleValue();
d=b-a;
mystack1.push(new Double(d));
i++;
break;
case '*':
a=mystack1.pop().doubleValue();
b=mystack1.pop().doubleValue();
d=b*a;
mystack1.push(new Double(d));
i++;
break;
case '/':
a=mystack1.pop().doubleValue();
b=mystack1.pop().doubleValue();
if(a!=0)
{
d=b/a;
mystack1.push(new Double(d));
i++;
}
else
{
System.out.println("Error!");
}
break;
default:
d=0;count=0;
while((c='0'c='9'))
{
d=10*d+c-'0';
i++;
c=anArray[i];
}
if(c=='.')
{
i++;
c=anArray[i];
while((c='0'c='9'))
{
count++;
d=d+(c-'0')/Math.pow(10,count);
i++;
c=anArray[i];
}
}
if(c=='#')
mystack1.push(new Double(d));
i++;
break;
}
}
return(mystack1.peek().doubleValue());
}
}
import java.util.Scanner;
import java.awt.*;
import java.awt.event.*;
public class Test extends WindowAdapter {
Panel p1 = new Panel();
Panel p2 = new Panel();
Panel p3 = new Panel();
TextField txt;
private Button[] b = new Button[17];
private String ss[] = { "7", "8", "9", "+", "4", "5", "6", "-", "1", "2",
"3", "*", "clear", "0", "=", "/", "close" };
static double a;
static String s, str;// 定义变量 创建对像
public static void main(String args[]) {
(new Test()).frame();
}
public void frame() {
Frame fm = new Frame("简单计算器");
for (int i = 0; i = 16; i++) {
b[i] = new Button(ss[i]);
}
for (int i = 0; i = 15; i++) {
p2.add(b[i]);
} // 创建按钮 并添加到P2
b[16].setBackground(Color.yellow);
txt = new TextField(15);
txt.setEditable(false);
for (int i = 0; i = 16; i++) {
b[i].addActionListener(new buttonlistener());// 添加监听器
}
b[16].addActionListener(new close());
fm.addWindowListener(this);
fm.setBackground(Color.red);
p1.setLayout(new BorderLayout());
p1.add(txt, "North");
p2.setLayout(new GridLayout(4, 4));
p3.setLayout(new BorderLayout());
p3.add(b[16]);
fm.add(p1, "North");
fm.add(p2, "Center");
fm.add(p3, "South");
fm.pack();
fm.setVisible(true);// 都是些窗中设置 添加相关组件和监听器
}
public void windowClosing(WindowEvent e) {
System.exit(0);// 退出系统
}
class buttonlistener implements ActionListener {// 编写监听器事件 通过按键得出给果
public void actionPerformed(ActionEvent e) {
Button btn = (Button) e.getSource();
if (btn.getLabel() == "=") {
jisuan();
str = String.valueOf(a);
txt.setText(str);
s = "";
} else if (btn.getLabel() == "+") {
jisuan();
txt.setText("");
s = "+";
} else if (btn.getLabel() == "-") {
jisuan();
txt.setText("");
s = "-";
} else if (btn.getLabel() == "/") {
jisuan();
txt.setText("");
s = "/";
} else if (btn.getLabel() == "*") {
jisuan();
txt.setText("");
s = "*";
} else {
txt.setText(txt.getText() + btn.getLabel());
if (btn.getLabel() == "clear")
txt.setText("");
}
}
public void jisuan() {// 编写具体计算方法
if (s == "+")
a += Double.parseDouble(txt.getText());
else if (s == "-")
a -= Double.parseDouble(txt.getText());
else if (s == "*")
a *= Double.parseDouble(txt.getText());
else if (s == "/")
a /= Double.parseDouble(txt.getText());
else
a = Double.parseDouble(txt.getText());
}
}
}
class close implements ActionListener {// 退出
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
}
java设计计算器，主要是使用java swing，对每个按钮进行监听，实现相关功能，如下代码：
package com.qiu.lin.he;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingConstants;
public class Jisuanqi extends JFrame implements ActionListener {
/**
*
*/
private static final long serialVersionUID = 1L;
Result result = new Result(); // 定义text的面板
Number_Key number_key = new Number_Key(); // 定义按钮面板
// 当点击按钮+、-、*、/时，com = true
boolean com = false;
// 当i=0时说明是我们第一次输入，字符串text不会累加
int i = 0;
// 存放text的内容
String text = "";
// 存放点击按钮+、-、*、/之前的数值
double defbutton = 0;
// +、-、*、/的代号分别为1，2，3，4
int symbol = 0;
// 构造函数
Jisuanqi() {
super("WangJiao"); // 设定标题
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // 设定关闭窗体时退出程序
JPanel pane = new JPanel(); // 定义主面板
pane.setLayout(new BorderLayout());
setBounds(380, 220, 30, 80); // 前两个参数是在屏幕上显示的坐标，后两个是大小
// 替换图标
ImageIcon icon = new ImageIcon("F:1.GIF");
// Jisuanqi.class.getResource("APPLE.GIF")
// );
setIconImage(icon.getImage());
pane.add(result, BorderLayout.NORTH);
pane.add(number_key, BorderLayout.CENTER);
pane.add(number_key.equal, BorderLayout.SOUTH);
number_key.one.addActionListener(this); // 对1按钮添加监听事件
number_key.two.addActionListener(this); // 对2按钮添加监听事件
number_key.three.addActionListener(this); // 对3按钮添加监听事件
number_key.four.addActionListener(this); // 对4按钮添加监听事件
number_key.five.addActionListener(this); // 对5按钮添加监听事件
number_key.six.addActionListener(this); // 对6按钮添加监听事件
number_key.seven.addActionListener(this); // 对7按钮添加监听事件
number_key.eight.addActionListener(this); // 对8按钮添加监听事件
number_key.nine.addActionListener(this); // 对9按钮添加监听事件
number_key.zero.addActionListener(this); // 对0按钮添加监听事件
number_key.ce.addActionListener(this); // 对置零按钮添加监听事件
number_key.plus.addActionListener(this); // 对+按钮添加监听事件
number_key.equal.addActionListener(this); // 对=按钮添加监听事件
number_key.sub.addActionListener(this); // 对-按钮添加监听事件
number_key.mul.addActionListener(this); // 对*按钮添加监听事件
number_key.div.addActionListener(this); // 对/按钮添加监听事件
number_key.point.addActionListener(this); // 对.按钮添加监听事件
setContentPane(pane);
pack(); // 初始化窗体大小为正好盛放所有按钮
}
// 各个按钮触发的事件
public void actionPerformed(ActionEvent e) {
/*
* 如果是点击数字按钮那么先要判断是否在此之前点击了+、-、*、/、=，如果是那么com=true 如果没有com=
* false;或者是否点击数字键，如果是i = 1,如果没有 i = 0;
*/
if (e.getSource() == number_key.one) {
if (com || i == 0) {
result.text.setText("1");
com = false;
i = 1;
} else {
text = result.text.getText();
result.text.setText(text + "1");
}
} else if (e.getSource() == number_key.two) {
if (com || i == 0) {
result.text.setText("2");
com = false;
i = 1;
} else {
text = result.text.getText();
result.text.setText(text + "2");
}
} else if (e.getSource() == number_key.three) {
if (com || i == 0) {
result.text.setText("3");
com = false;
i = 1;
} else {
text = result.text.getText();
result.text.setText(text + "3");
}
} else if (e.getSource() == number_key.four) {
if (com || i == 0) {
result.text.setText("4");
com = false;
i = 1;
} else {
text = result.text.getText();
result.text.setText(text + "4");
}
} else if (e.getSource() == number_key.five) {
if (com || i == 0) {
result.text.setText("5");
com = false;
i = 1;
} else {
text = result.text.getText();
result.text.setText(text + "5");
}
} else if (e.getSource() == number_key.six) {
if (com || i == 0) {
result.text.setText("6");
com = false;
i = 1;
} else {
text = result.text.getText();
result.text.setText(text + "6");
}
} else if (e.getSource() == number_key.seven) {
if (com || i == 0) {
result.text.setText("7");
com = false;
i = 1;
} else {
text = result.text.getText();
result.text.setText(text + "7");
}
} else if (e.getSource() == number_key.eight) {
if (com || i == 0) {
result.text.setText("8");
com = false;
i = 1;
} else {
text = result.text.getText();
result.text.setText(text + "8");
}
} else if (e.getSource() == number_key.nine) {
if (com || i == 0) {
result.text.setText("9");
com = false;
i = 1;
} else {
text = result.text.getText();
result.text.setText(text + "9");
}
}
/*
* 对于0这个按钮有一定的说法，在我的程序里不会出现如00000这样的情况，我加了判断条件就是
* 如果text中的数值=0就要判断在这个数值中是否有.存在?如果有那么就在原来数值基础之上添 加0;否则保持原来的数值不变
*/
else if (e.getSource() == number_key.zero) { // result.text.getText()是得到text里内容的意思
if (com || i == 0) {
result.text.setText("0");
com = false;
i = 1;
} else {
text = result.text.getText();
if (Float.parseFloat(text) 0 || Float.parseFloat(text) 0) { // Float.parseFloat(text)就是类型转换了，下面都是一样
result.text.setText(text + "0");
} else {
if (text.trim().indexOf(".") == -1) {
result.text.setText(text);
} else {
result.text.setText(text + "0");
}
}
}
} else if (e.getSource() == number_key.ce) {
result.text.setText("0");
i = 0;
com = true;
// text = "";
defbutton = 0;
}
/*
* 本程序不会让一个数值中出现2个以上的小数点.具体做法是:判断是否已经存在.存在就不添加, 不存在就添加.
*/
else if (e.getSource() == number_key.point) {
if (com || i == 0) {
result.text.setText("0.");
com = false;
i = 1;
} else {
text = result.text.getText();
if (text.trim().indexOf(".") == -1) {
result.text.setText(text + ".");
} else {
result.text.setText(text);
}
}
} // 获得点击+之前的数值
else if (e.getSource() == number_key.plus) {
com = true;
i = 0;
defbutton = Double.parseDouble(result.text.getText());
symbol = 1;
} // 获得点击-之前的数值
else if (e.getSource() == number_key.sub) {
com = true;
i = 0;
defbutton = Double.parseDouble(result.text.getText());
symbol = 2;
} // 获得点击*之前的数值
else if (e.getSource() == number_key.mul) {
com = true;
i = 0;
defbutton = Double.parseDouble(result.text.getText());
System.out.println(defbutton);
symbol = 3;
} // 获得点击/之前的数值
else if (e.getSource() == number_key.div) {
com = true;
i = 0;
defbutton = Double.parseDouble(result.text.getText());
symbol = 4;
} else if (e.getSource() == number_key.equal) {
switch (symbol) {
case 1: { // 计算加法
double ad = defbutton
+ Double.parseDouble(result.text.getText());
result.text.setText(ad + "");
i = 0;
text = "";
break;
}
case 2: { // 计算减法
double ad = defbutton
- Double.parseDouble(result.text.getText());
result.text.setText(String.valueOf(ad));
i = 0;
text = "";
break;
}
case 3: { // 计算乘法
double ad = defbutton
* Double.parseDouble(result.text.getText());
result.text.setText(ad + "");
i = 0;
text = "";
break;
}
case 4: { // 计算除法
double ad = defbutton
/ Double.parseDouble(result.text.getText());
result.text.setText(ad + "");
i = 0;
text = "";
break;
}
}
System.out.println(com);
}
System.out.println(result.text.getText());
}
@SuppressWarnings("deprecation")
public static void main(String[] args) {
Jisuanqi loveyou = new Jisuanqi();
loveyou.show();
}
}
// 计算器数字按钮定义面板
class Number_Key extends JPanel {
/**
*
*/
private static final long serialVersionUID = 1L;
JButton zero = new JButton("0"); // 数字键0
JButton one = new JButton("1"); // 数字键1
JButton two = new JButton("2"); // 数字键2
JButton three = new JButton("3"); // 数字键3
JButton four = new JButton("4"); // 数字键4
JButton five = new JButton("5"); // 数字键5
JButton six = new JButton("6"); // 数字键6
JButton seven = new JButton("7"); // 数字键7
JButton eight = new JButton("8"); // 数字键8
JButton nine = new JButton("9"); // 数字键9
JButton plus = new JButton("+");
JButton sub = new JButton("-");
JButton mul = new JButton("*");
JButton div = new JButton("/");
JButton equal = new JButton("=");
JButton ce = new JButton("清零"); // 置零键
JButton point = new JButton(".");
Number_Key() {
setLayout(new GridLayout(4, 4, 1, 1)); // 定义布局管理器为网格布局
setBackground(Color.blue); // 设置背景颜色
// 添加按钮
add(one);
add(two);
add(three);
add(four);
add(five);
add(six);
add(seven);
add(eight);
add(nine);
add(zero);
add(plus);
add(sub);
add(mul);
add(div);
add(point);
add(equal);
add(ce);
}
}
// 计算器显示结果的窗体
class Result extends JPanel {
/**
*
*/
private static final long serialVersionUID = 1L;
// text先是输入和结果
JTextField text = new JTextField("0");
@SuppressWarnings("deprecation")
Result() { // 讲输入的数字或得到的结果在text的右边显示
text.setHorizontalAlignment(SwingConstants.RIGHT);
text.enable(false); // 文本框不能编辑
setLayout(new BorderLayout()); // 设定布局管理器边框布局
add(text, BorderLayout.CENTER); // text放置在窗体的中间
}
}
运行结果如下：
上面 wuzhikun12同学写的不错，但我想还不能运行，并且还不太完善。我给个能运行的：（注意：文件名为：Test.java)
//要实现对象间的比较，就必须实现Comparable接口，它里面有个compareTo方法
//Comparable最好使用泛型，这样，无论是速度还是代码量都会减少
@SuppressWarnings("unchecked")
class Student implements ComparableStudent{
private String studentNo; //学号
private String studentName; //姓名
private double englishScore; //英语成绩
private double computerScore; //计算机成绩
private double mathScore; //数学成绩
private double totalScore; //总成绩
//空构造函数
public Student() {}
//构造函数
public Student(String studentNo,String studentName,double englishSocre,double computerScore,double mathScore) {
this.studentNo = studentNo;
this.studentName = studentName;
this.englishScore = englishSocre;
this.computerScore = computerScore;
this.mathScore = mathScore;
}
//计算总成绩
public double sum() {
this.totalScore = englishScore+computerScore+mathScore;
return totalScore;
}
//计算评测成绩
public double testScore() {
return sum()/3;
}
//实现compareTO方法
@Override
public int compareTo(Student student) {
double studentTotal = student.getTotalScore();
return totalScore==studentTotal?0:(totalScorestudentTotal?1:-1);
}
//重写toString方法
public String toString(){
return "学号："+this.getStudentNo()+" 姓名："+this.getStudentName()+" 英语成绩："+this.getEnglishScore()+" 数学成绩："+this.getMathScore()+" 计算机成绩："+this.getComputerScore()+" 总成绩："+this.getTotalScore();
}
//重写equals方法
public boolean equals(Object obj) {
if(obj == null){
return false;
}
if(!(obj instanceof Student)){
return false;
}
Student student = (Student)obj;
if(this.studentNo.equals(student.getStudentName())) { //照现实来说，比较是不是同一个学生，应该只是看他的学号是不是相同
return true;
} else {
return false;
}
}
/*以下为get和set方法，我个人认为，totalScore的set的方法没必要要，因为它是由其它成绩计算出来的
在set方法中，没设置一次值，调用一次sum方法，即重新计算总成绩
*/
public String getStudentNo() {
return studentNo;
}
public void setStudentNo(String studentNo) {
this.studentNo = studentNo;
sum();
}
public String getStudentName() {
return studentName;
}
public void setStudentName(String studentName) {
this.studentName = studentName;
sum();
}
public double getEnglishScore() {
return englishScore;
}
public void setEnglishScore(double englishScore) {
this.englishScore = englishScore;
sum();
}
public double getComputerScore() {
return computerScore;
}
public void setComputerScore(double computerScore) {
this.computerScore = computerScore;
sum();
}
public double getMathScore() {
return mathScore;
}
public void setMathScore(double mathScore) {
this.mathScore = mathScore;
sum();
}
public double getTotalScore() {
return totalScore;
}
}
//Student子类学习委员类的实现
class StudentXW extends Student {
//重写父类Student的testScore()方法
@Override
public double testScore() {
return sum()/3+3;
}
public StudentXW() {}
//StudentXW的构造函数
public StudentXW(String studentNo,String studentName,double englishSocre,double computerScore,double mathScore) {
super(studentNo,studentName,englishSocre,computerScore,mathScore);
}
}
//Student子类班长类的实现
class StudentBZ extends Student {
//重写父类Student的testScore()方法
@Override
public double testScore() {
return sum()/3+5;
}
public StudentBZ() {}
//StudentXW的构造函数
public StudentBZ(String studentNo,String studentName,double englishSocre,double computerScore,double mathScore) {
super(studentNo,studentName,englishSocre,computerScore,mathScore);
}
}
//测试类
public class Test {
public static void main(String[] args) {
//生成若干个student类、StudentXW类、StudentBZ类
Student student1 = new Student("s001","张三",70.5,50,88.5);
Student student2 = new Student("s002","李四",88,65,88.5);
Student student3 = new Student("s003","王五",67,77,90);
StudentXW student4 = new StudentXW("s004","李六",99,88,99.5);
StudentBZ student5 = new StudentBZ("s005","朱漆",56,65.6,43.5);
Student[] students = {student1,student2,student3,student4,student5};
for(int i = 0 ; istudents.length; i++){
double avgScore = students[i].testScore();
System.out.println(students[i].getStudentName()+"学生的评测成绩为："+ avgScore+"分");
}
}
}
运行结果为：
张三学生的评测成绩为：69.66666666666667分
李四学生的评测成绩为：80.5分
王五学生的评测成绩为：78.0分
李六学生的评测成绩为：98.5分
朱漆学生的评测成绩为：60.03333333333333分