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求一Java代码，要简单的。大概一百多行的的。
题目：一球从100米高度自由落下，每次落地后反跳回原高度的一半；再落下，求它在 第10次落地时，共经过多少米？第10次反弹多高？
这个题目，下面我会贴出来两种代码。其实这个题目，我烦了简单计算，想搞得有趣味性一点，结果耽误了好几天时间，最后发现搞的也不好。
先第一种，为了解题而解题。
==== Main.java ====
public class Main {
private double TotalHeight = 100;
private double CurHeight = 50;
public void drop(int times) {
if ((times - 1) == 0) {
return;
}
setTotalHeight(getTotalHeight() + 2 * getCurHeight());
setCurHeight(getCurHeight() / 2);
drop(times - 1);
}
public double getTotalHeight() {
return TotalHeight;
}
public void setTotalHeight(double totalHeight) {
TotalHeight = totalHeight;
}
public double getCurHeight() {
return CurHeight;
}
public void setCurHeight(double curHeight) {
CurHeight = curHeight;
}
public static void main(String[] args) {
Main main = new Main();
main.drop(2);
System.out.println("Total height is " +
main.getTotalHeight());
System.out.println("Current height is " +
main.getCurHeight());
}
}
==== 然后是第二种 =====
==== Main.java ====
package main;
import javax.swing.JFrame;
import panel.BallPanel;
import time.Delay;
public class MainFrame extends JFrame {
public MainFrame(String title) {
super(title);
}
public static void main(String[] args) {
Delay delay = new Delay();
MainFrame frame = new MainFrame("Hello JFrame");
BallPanel ballPanel = new BallPanel();
frame.add(ballPanel);
frame.setSize(500, 500);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
delay.initDelay();
ballPanel.setDelay(delay.getDelay());
ballPanel.loopDrop(0);
}
}
==== Delay.java ====
package time;
public class Delay {
public void initDelay() {
int g = 10;
int i = 0;
double s, t, t0 = 0.0;
delay = new int[100];
for (s = 100; s 10100; s += 100) {
t = Math.sqrt(2 * s / g);
delay[i++] = (int) ((t - t0) * 100);
t0 = t;
}
}
public int[] getDelay() {
return delay;
}
private int delay[];
}
==== BallPanel.java ====
package panel;
import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JPanel;
public class BallPanel extends JPanel {
public BallPanel() {
super();
}
public void paint(Graphics g) {
g.clearRect(0, 0, this.getWidth(), this.getHeight());
g.setColor(Color.BLUE);
g.fillOval(250, ballCenter, 30, 30);
}
public void loopDrop(int height) {
int i;
if (this.height == height) { // At bottom
for (i = 0; i targetHeight; i += MUL) {
ballCenter = this.height - i;
this.repaint();
try {
Thread.sleep(delay[(targetHeight - i - 1) / MUL]);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
loopDrop(this.height - i);
} else { // At top
for (i = height; i this.height; i += MUL) {
ballCenter = i;
this.repaint();
try {
Thread.sleep(delay[(i - height) / MUL]);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
targetHeightV = targetHeightV / 2;
targetHeight = targetHeightV;
if (targetHeight != 0) {
loopDrop(i);
}
}
}
public void setDelay(int delay[]) {
this.delay = delay;
}
private int extracted() {
return 100 * MUL;
}
private int targetHeight = extracted();
private int targetHeightV = extracted();
private int ballCenter = 0;
private int height = extracted();
private int delay[];
private final int MUL = 4;
}
其实所谓的第二种，是用的JFrame在JPanel上画图，直观的展示出来每次弹起来的效果。因为100像素实在太小了，所以我做了一个变量MUL，相
当于是等比例扩大的效果。问题就是弹不到10次距离就用光了，所以。。。。。权当娱乐了。。当然可以等比例在放大，例如100M看成是10000像素，这
样能多弹几次。这个程序，最后球就在那里不动了，程序不会自己退出。
相关问答
Q1: java线程的经典代码
package threadgroup;
class ThreadDemo3 extends Thread {
private String name;
private int delay;
public ThreadDemo3(String sname, int i_delay) {
name = sname;
delay = i_delay;
}
public void run() {
try {
sleep(delay);
} catch (InterruptedException e) {
}
System.out.println("多线程测试！\n" + name + "\n" + delay);
}
}
public class testMyThread {
public static void main(String[] args) {
ThreadDemo3 th1,th2,th3;
th1 = new ThreadDemo3("线程1", (int) (Math.random() * 900));
th2 = new ThreadDemo3("线程2", (int) (Math.random() * 900));
th3 = new ThreadDemo3("线程3", (int) (Math.random() * 900));
th1.start();
th2.start();
th3.start();
}
}
package threadgroup;
public class threadDemo {
public static void main(String[] args) {
Thread t = Thread.currentThread();
t.setName("你好吗？");
System.out.println("正在进行的Thread是：" + t);
try {
for (int i = 0; i 5; i++) {
System.out.println("我不叫穆继超" + i);
Thread.sleep(3000);
}
} catch (Exception e) {
// TODO: handle exception
System.out.println("Thread has wrong" + e.getMessage());
}
}
}
package threadgroup;
public class threadDemo2 implements Runnable {
public threadDemo2() {
Thread t1 = Thread.currentThread();
t1.setName("第一个主进程");
System.out.println("正在运行" + t1);
Thread t2 = new Thread(this, "");
System.out.println("在创建一个进程");
t2.start();
try {
System.out.println("使他进入第一个睡眠状态");
Thread.sleep(2000);
} catch (InterruptedException e) {
System.out.println("Thread has wrong" + e.getMessage());
}
System.out.println("退出第一个进程");
}
public void run() {
try {
for (int i = 0; i 5; i++) {
System.out.println("进程" + i);
Thread.sleep(3000);
}
} catch (InterruptedException e) {
// TODO: handle exception
System.out.println("Thread has wrong" + e.getMessage());
}
System.out.println("退出第二个进程");
}
public static void main(String[] args) {
new threadDemo2();
}
}
Q2: 谁能给一个Java程序代码我，要50行到100行就可以啦。最好有几行解释
给你一个前几天才帮人写的
“计算整钱兑零”。程序要求用户输入一个双精度数代表总元数，就会列出总值与其等价的1元币、二角五分币、5分币和1分币的数目。程序报告的数目是1元币的最大数、其次是二角五分币的最大数，等等，依此类推。只显示非零的单位。对单个单位显示单数单词，对多于一个单位的显示复数单词
import java.util.Scanner;
public class MoneyCalculate {
public static void main(String[] args) {
int max100 = 0;
int max25 = 0;
int max5 = 0;
int max1 = 0;
double money = getMoneyFromInput();
String str = String.valueOf(money).trim();
String[] ary = str.split("\\.");
max100 = Integer.parseInt(ary[0]);
if(ary.length == 2){
int fen = Integer.parseInt(ary[1]);
if(ary[1].trim().length() == 1){
fen = Integer.parseInt(ary[1]) * 10;
}
max25 = fen / 25;
if(fen % 25 != 0){
fen = fen % 25;
}else{
fen = 0;
}
max5 = fen / 5;
max1 = fen % 5;
}
StringBuilder sb = new StringBuilder(money + " = ");
if(max100 != 0){
sb.append(max100);
sb.append("*1 ");
}
if(max25 != 0){
sb.append(max25);
sb.append("*0.25 ");
}
if(max5 != 0){
sb.append(max5);
sb.append("*0.05 ");
}
if(max1 != 0){
sb.append(max1);
sb.append("*0.01 ");
}
System.out.println(sb.toString());
}
private static double getMoneyFromInput() {
Scanner scanner = new Scanner(System.in);
return scanner.nextDouble();
}
}
-----------
2.49
2.49 = 2*1 1*0.25 4*0.05 4*0.01
-----------
2.5
2.5 = 2*1 2*0.25
-----------
37.23
37.23 = 37*1 4*0.05 3*0.01
-----------------
123.569
123.569 = 123*1 22*0.25 3*0.05 4*0.01
Q3: 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，
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