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java案例源代码 java源代码的作用
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Java100行以上源代码,至少五个class以及一个interface,可以简单点?
下面是一个可能的Java源代码,它包含了一个接口(Shape)和五个类(Circle, Rectangle, Triangle, Square 和 Main)。它的功能是计算不同形状的面积和周长。
//定义一个接口Shape,有两个抽象方法:getArea()和getPerimeter()interface Shape { double getArea(); double getPerimeter();
}//定义一个类Circle,实现Shape接口class Circle implements Shape { //定义一个私有属性radius,表示圆的半径
private double radius; //定义一个公有构造方法,用于初始化radius
public Circle(double radius) { this.radius = radius;
} //实现getArea()方法,返回圆的面积
public double getArea() { return Math.PI * radius * radius;
} //实现getPerimeter()方法,返回圆的周长
public double getPerimeter() { return Math.PI * radius * 2;
}
}//定义一个类Rectangle,实现Shape接口class Rectangle implements Shape { //定义两个私有属性width和height,表示矩形的宽度和高度
private double width; private double height; //定义一个公有构造方法,用于初始化width和height
public Rectangle(double width, double height) { this.width = width; this.height = height;
} //实现getArea()方法,返回矩形的面积
public double getArea() { return width * height;
} //实现getPerimeter()方法,返回矩形的周长
public double getPerimeter() { return (width + height) *2;
}
}//定义一个类Triangle,实现Shape接口class Triangle implements Shape { //定义三个私有属性a,b,c表示三角形的三条边长
private double a; private double b; private double c; //定义一个公有构造方法,用于初始化a,b,c,并检查是否满足三角形条件(任意两边之和大于第三边)
public Triangle(double a, double b, double c) throws Exception{ if (a + b c a + c b b + c a) {
this.a = a; this.b = b;
this.c = c;
} else {
throw new Exception("Invalid triangle");
}
} //实现getArea()方法,返回三角形的面积(使用海伦公式)
public double getArea() { //计算半周长p
double p = (a + b + c) /2; //计算并返回面积s(使用Math.sqrt()函数求平方根)
return Math.sqrt(p * (p - a) * (p - b) * (p - c));
} //实现getPerimeter()方法,返回三角形的周长
public double getPerimeter(){ return a + b + c;
}
}//定义一个类Square,继承Rectangle类,并重写构造方法和toString()方法class Square extends Rectangle { //重写构造方法,在调用父类构造方法时传入相同的参数side作为width和height
public Square(double side){ super(side, side);
} //重写toString()方法,在原来基础上加上"Square:"前缀,并只显示side属性而不显示width和height属性(使用String.format()函数格式化字符串)
@Override
public String toString(){ return String.format("Square: side=%.2f", super.width); /* 或者直接使用super.getPerimeter()/4作为side */
/* return String.format("Square: side=%.2f", super.getPerimeter()/4); */
/* 注意:不能直接访问super.side属性,
相关问答
Q1: java课程设计源代码(急!!!!)
import java.awt.Color;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.SwingConstants;
import javax.swing.border.LineBorder;
public class game21 extends JFrame {
private JLabel label_2;
private int number;
private int sum;
final JLabel label = new JLabel();
final JLabel label_1 = new JLabel();
public static void main(String[] args) {
new game21();
}
public game21() {
super("21点?!");
getContentPane().setLayout(null);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
final JButton button = new JButton();
button.addActionListener(new ActionListener() {
public void actionPerformed(final ActionEvent arg0) {
onClick();
}
});
button.setText("出牌");
button.setBounds(170, 350, 106, 28);
getContentPane().add(button);
label.setBorder(new LineBorder(Color.black, 1, false));
label.setHorizontalAlignment(SwingConstants.CENTER);
label.setFont(new Font("", Font.BOLD, 26));
label.setText("背面");
label.setBounds(158, 81, 137, 153);
getContentPane().add(label);
label_1.setText("你已经拥有的牌:");
label_1.setBounds(109, 22, 270, 45);
getContentPane().add(label_1);
this.setBounds(200, 300, 501, 528);
this.setVisible(true);
getContentPane().add(getLabel_2());
}
public int randNumber() {
try {
Thread.sleep(10);
} catch (InterruptedException e) {
e.printStackTrace();
}
return (int) (Math.random() * 10 + 1);
}
public void onClick() {
number = this.randNumber();
this.sum += number;
label.setText("" + number);
String strTemp = this.label_1.getText();
strTemp += "" + number + " ";
label_1.setText(strTemp);
String temp = "合计:" + sum;
label_2.setText(temp);
isWin();
}
public void isWin() {
if (sum 21) {
JOptionPane.showMessageDialog(this, "你输了");
clear();
return;
} else if (sum == 21) {
JOptionPane.showMessageDialog(this, "你赢了");
clear();
return;
} else {
int i = JOptionPane.showOptionDialog(this, "是否继续?", "提示",
JOptionPane.OK_CANCEL_OPTION,
JOptionPane.INFORMATION_MESSAGE, null, null, null);
if (i == JOptionPane.OK_OPTION) {
onClick();
} else
return;
}
}
private void clear() {
label_2.setText("合计:");
sum = 0;
number = 0;
label_1.setText("你已经拥有的牌:");
}
/**
* @return
*/
protected JLabel getLabel_2() {
if (label_2 == null) {
label_2 = new JLabel();
label_2.setText("合计:");
label_2.setBounds(313, 35, 66, 18);
}
return label_2;
}
}
真好无聊中。。
Q2: 求JAVA源代码
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
public class GradeStatistic {
public static void main(String[] args) {
GradeStatistic gs = new GradeStatistic();
ListMark list = new ArrayListMark();
float sum = 0;
while(true){
Scanner sc = new Scanner(System.in);
System.out.print("Please input student name: ");
String name = sc.nextLine();
if(name.equals("end")){
break;
}
System.out.print("Please input student score: ");
float score = sc.nextFloat();
sum += score;
list.add(gs.new Mark(name, score));
}
float max = list.get(0).getScore();
float min = list.get(0).getScore();
for(Mark mark: list){
if(max mark.getScore()){
max = mark.getScore();
}
if(min mark.getScore()){
min = mark.getScore();
}
}
float average = sum / list.size();
System.out.println("Average is: " + average);
System.out.println("Max is: " + max);
System.out.println("Min is: " + min);
}
private class Mark{
private String name;
private float score;
public Mark(String name, float score){
this.name = name;
this.score = score;
}
public String getName() {
return name;
}
public float getScore() {
return score;
}
}
}
----------------------
Please input student name: Zhang san
Please input student score: 100
Please input student name: Li Si
Please input student score: 91
Please input student name: Ec
Please input student score: 35
Please input student name: ma qi
Please input student score: 67
Please input student name: end
Average is: 73.25
Max is: 100.0
Min is: 35.0
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