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？
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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。
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Painter extends JFrame{
/**
*
*/
private static final long serialVersionUID = 8160427604782702376L;
CanvasPanel canvas = new CanvasPanel();;
public Painter() {
super("Star");
this.add(canvas);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.pack();
this.setResizable(false);
this.setLocationRelativeTo(null);
this.setVisible(true);
}
public static void main(String[] args) {
new Painter();
}
}
class CanvasPanel extends JPanel implements ActionListener{
/**
*
*/
private static final long serialVersionUID = -4642528854538741028L;
private JButton[] btn = new JButton[4];
private String[] btn_name = {"+", "-", "R", "L"};
private int center_x = 200, center_y = 200, radius = 100, degree = 0;
public CanvasPanel() {
this.setPreferredSize(new Dimension(400, 500));
this.setLayout(null);
for(int i = 0; i 4; i++) {
btn[i] = new JButton(btn_name[i]);
btn[i].setBounds(160 + i * 60, 425, 50, 50);
btn[i].addActionListener(this);
this.add(btn[i]);
}
}
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
for(int i = 0; i 5; i++) {
g.drawLine( (int) (center_x + radius * Math.sin(Math.toRadians(degree + 72 * i))),
(int) (center_y - radius * Math.cos(Math.toRadians(degree + 72 * i))),
(int) (center_x + radius * Math.sin(Math.toRadians(degree + 72 * i + 144))),
(int) (center_y - radius * Math.cos(Math.toRadians(degree + 72 * i + 144))));
}
}
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
if(e.getActionCommand() == "+") {
if(radius 200)
radius += 2;
repaint();
} else if(e.getActionCommand() == "-") {
if(radius 0)
radius -= 2;
repaint();
} else if(e.getActionCommand() == "R") {
degree = (degree + 2) % 360;
repaint();
} else if(e.getActionCommand() == "L") {
degree = (degree - 2) % 360;
repaint();
}
}
}
200多行，程序功能是输入两个数字的英文单词（20以内），输出结果，这个结果也是一个英文(就是将结果转换成英文输出)
import java.util.Scanner;
public class test{
private static String temp, tempNumA, tempNumB;
private static int geWei, shiWei, baiWei, judgeA, judgeB;
private static int number(String inputNum) {
if (inputNum.equalsIgnoreCase("zero")) {
return 0;
} else if (inputNum.equalsIgnoreCase("one")) {
return 1;
} else if (inputNum.equalsIgnoreCase("two")) {
return 2;
} else if (inputNum.equalsIgnoreCase("three")) {
return 3;
} else if (inputNum.equalsIgnoreCase("four")) {
return 4;
} else if (inputNum.equalsIgnoreCase("five")) {
return 5;
} else if (inputNum.equalsIgnoreCase("six")) {
return 6;
} else if (inputNum.equalsIgnoreCase("seven")) {
return 7;
} else if (inputNum.equalsIgnoreCase("eigth")) {
return 8;
} else if (inputNum.equalsIgnoreCase("nine")) {
return 9;
} else if (inputNum.equalsIgnoreCase("ten")) {
return 10;
} else if (inputNum.equalsIgnoreCase("eleven")) {
return 11;
} else if (inputNum.equalsIgnoreCase("twelve")) {
return 12;
} else if (inputNum.equalsIgnoreCase("thirteen")) {
return 13;
} else if (inputNum.equalsIgnoreCase("fourteen")) {
return 14;
} else if (inputNum.equalsIgnoreCase("fifteen")) {
return 15;
} else if (inputNum.equalsIgnoreCase("sixteen")) {
return 16;
} else if (inputNum.equalsIgnoreCase("seventeen")) {
return 17;
} else if (inputNum.equalsIgnoreCase("eighteen")) {
return 18;
} else if (inputNum.equalsIgnoreCase("nineteen")) {
return 19;
} else if (inputNum.equalsIgnoreCase("twenty")) {
return 20;
} else {
return -1;
}
}
private static String lessTen(int num) {
switch (num) {
case 0:
temp = "zero";
break;
case 1:
temp = "one";
break;
case 2:
temp = "two";
break;
case 3:
temp = "three";
break;
case 4:
temp = "four";
break;
case 5:
temp = "five";
break;
case 6:
temp = "six";
break;
case 7:
temp = "seven";
break;
case 8:
temp = "eight";
break;
case 9:
temp = "nine";
break;
default:
temp = "erro";
break;
}
return temp;
}
private static String moreThanTen(int num) {
if (num 20) {
switch (num) {
case 10:
temp = "ten";
break;
case 11:
temp = "eleven";
break;
case 12:
temp = "twelve";
break;
case 13:
temp = "thirteen";
break;
case 14:
temp = "fourteen";
break;
case 15:
temp = "fifteen";
break;
case 16:
temp = "sixteen";
break;
case 17:
temp = "seventeen";
break;
case 18:
temp = "eighteen";
break;
case 19:
temp = "nineteen";
break;
}
} else if (num = 20) {
switch (num) {
case 20:
temp = "twenty";
break;
case 30:
temp = "thirty";
break;
case 40:
temp = "forty";
break;
case 50:
temp = "fifty";
break;
case 60:
temp = "sixty";
break;
case 70:
temp = "seventy";
break;
case 80:
temp = "eighty";
break;
case 90:
temp = "ninety";
break;
}
}
return temp;
}
private static void outputReult(int num) {
if (num = 0 num = 9) {
System.out.println(lessTen(num));
} else if (num = 10 num = 19) {
System.out.println(moreThanTen(num));
} else if (num = 20 num = 99) {
shiWei = num / 10;
geWei = num % 10;
if (geWei == 0) {
System.out.println(moreThanTen(shiWei * 10));
} else {
System.out.println(moreThanTen(shiWei * 10) + "-"
+ lessTen(geWei));
}
} else if (num = 100 num = 400) {
baiWei = num / 100;
shiWei = num % 100 / 10;
geWei = num % 100 % 10;
if (shiWei == 0 geWei == 0) {
System.out.println(lessTen(baiWei) + " " + "hundred");
} else if (shiWei == 0 geWei != 0) {
System.out.println(lessTen(baiWei) + " " + "hundred" + " "
+ "and" + " " + lessTen(geWei));
} else if (shiWei != 0 geWei == 0) {
System.out.println(lessTen(baiWei) + " " + "hundred" + " "
+ "and" + " " + moreThanTen(shiWei * 10 + geWei));
} else {
if (shiWei == 1 geWei != 0) {
System.out.println(lessTen(baiWei) + " " + "hundred" + " "
+ "and" + " " + moreThanTen(shiWei * 10 + geWei));
} else {
System.out.println(lessTen(baiWei) + " " + "hundred" + " "
+ "and" + " " + moreThanTen(shiWei * 10) + "-"
+ lessTen(geWei));
}
}
}
}
public static void inputNumber() {
System.out.print("请输入第一个数字(数字必须小于等于20)的单词：");
tempNumA = new Scanner(System.in).next();
judgeA = number(tempNumA);
System.out.print("请输入第二个数字(数字必须小于等于20)的单词：");
tempNumB = new Scanner(System.in).next();
judgeB = number(tempNumB);
if (judgeA == -1 || judgeB == -1) {
System.out.println("你输入的数字单词不正确，请重新输入！");
System.out.println(" ");
inputNumber();
}
}
public static void main(String[] args) {
inputNumber();
System.out.print(tempNumA + " multiply " + tempNumB + " equals ");
outputReult(number(tempNumA) * number(tempNumB));
}
}
以前写的，很乱。仅供参考
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import java.util.ArrayList;
public class T implements ActionListener{
private int append = 1;
JTextField jtf = new JTextField(10);
String s1="";
String s2="";
int n=0;
ArrayListString aList1=new ArrayListString();
ArrayListString aList2=new ArrayListString();
public T(){
JFrame jf = new JFrame("计算器");
jf.add(jtf,BorderLayout.NORTH);
jf.setSize(200,100 );
JPanel jp = new JPanel();
GridLayout gl = new GridLayout(5,4);
jp.setLayout(gl);
String[] lab = {"BackS","CE","C","+",
"7","8","9","-","4","5","6","*",
"1","2","3","/","0",".","+/-","="};
for(int i=0;ilab.length;i++){
JButton jb = new JButton(lab[i]);
jp.add(jb);
jb.addActionListener(this);
}
jf.add(jp);
jf.setSize(300,300);
jtf.setEditable(false);
jf.setResizable(false);
jf.setLocation(300, 200);jf.setVisible(true);
jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
String num1 = "0";
String operator = "+";
public void actionPerformed(ActionEvent ae) {
String comm = ae.getActionCommand();
if("0123456789".indexOf(comm)!=-1){
if(append==1){
n=0;
s2=s2+comm;
s1=s1+comm;
}
else{
aList1.clear();
append=1;
s2=s2+comm;
s1=comm;
}
jtf.setText(s1);
}else if("+-*/".indexOf(comm)!=-1){
n++;
if(n==1){
s1=s1+comm;
aList2.add(comm);
}
if(append==0)
append=1;
if(s2!=""){
aList1.add(s2);
}
s2="";
jtf.setText(s1);
}else if("=".equals(comm)){
aList1.add(s2);
double d1;
double d2;
int i=0;
while(aList2.contains("*")||aList2.contains("/")){
int flag=0;
if(aList2.size()0"*".equals(aList2.get(i))){
d1 = Double.parseDouble(aList1.get(i));
d2 = Double.parseDouble(aList1.get(i+1));
d1=d1*d2;
aList1.remove(i);
System.out.println("RE:"+aList1);
aList1.set(i,d1+"");
System.out.println("Set:"+aList1);
aList2.remove(i);
System.out.println(aList2);
flag++;
System.out.println("*"+i);
}
if(i==aList2.size())
i--;
if(aList2.size()0"/".equals(aList2.get(i))){
System.out.println("/"+i);
d1 = Double.parseDouble(aList1.get(i));
d2 = Double.parseDouble(aList1.get(i+1));
d1=d1/d2;
aList1.remove(i);
aList1.set(i,d1+"");
aList2.remove(i);
flag++;
System.out.println("/"+aList2);
}
if(flag==0)
i++;
}
while(aList2.contains("+")||aList2.contains("-")){
i=0;
if("+".equals(aList2.get(i))){
d1 = Double.parseDouble(aList1.get(i));
d2 = Double.parseDouble(aList1.get(i+1));
d1=d1+d2;
aList1.remove(i);
System.out.println("Re"+aList1);
aList1.set(i,d1+"");
System.out.println("Set:"+aList1);
aList2.remove(i);
System.out.println("alist2:"+aList2);
System.out.println(aList2.size());
}
if(aList2.size()0"-".equals(aList2.get(i))){
d1 = Double.parseDouble(aList1.get(i));
d2 = Double.parseDouble(aList1.get(i+1));
d1=d1-d2;
aList1.remove(i);
aList1.set(i,d1+"");
aList2.remove(i);
}
}
s1=s1+comm+aList1.get(aList1.size()-1);
jtf.setText(s1);
s2="";
s1=aList1.get(aList1.size()-1);
append = 0;
}else if(".".equals(comm)){
String temp=s2;
if(temp.indexOf(".")==-1){
s1=s1+comm;
jtf.setText(s1);
s2=s2+comm;
append = 1;
}
}else if("+/-".equals(comm)){
String temp = jtf.getText();
if(temp.startsWith("-")){
jtf.setText(temp.substring(1));
}else{
jtf.setText("-"+temp);
}
}else if("CE".equals(comm)||"C".equals(comm)){
jtf.setText("0");
s2="";
s1="";
append = 0;
}else if("BackS".equals(comm)){
String temp = s1;
if(temp.length()0){
if(s1.endsWith("+")||s1.endsWith("-")||s1.endsWith("*")||s1.endsWith("/")){
System.out.print("不可再移除!");
return ;
}
jtf.setText(temp.substring(0,
temp.length()-1));
s1=s1.substring(0, s1.length()-1);
s2=s2.substring(0,s2.length()-1);
}
else{
System.out.println("没有可以移除的！");
}
}
}
public static void main(String[] args) {
new T();
}
}
贪吃蛇游戏 望采纳
import java.awt.Button;
import java.awt.Color;
import java.awt.GridLayout;
import java.awt.Point;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.util.*;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
public class Snake extends JFrame implements KeyListener{
int Count=0;
Button[][] grid = new Button[20][20];
ArrayListPoint snake_list=new ArrayListPoint();
Point bean=new Point(-1,-1);//保存随机豆子【坐标】
int Direction = 1; //方向标志 1:上 2:下 3:左 4:右
//构造方法
public Snake()
{
//窗体初始化
this.setBounds(400,300,390,395);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
GridLayout f=new GridLayout(20,20);
this.getContentPane().setBackground(Color.gray);
this.setLayout(f);
//初始化20*20个按钮
for(int i=0;i20;i++)
for(int j=0;j20;j++)
{
grid[i][j]=new Button();
this.add(grid[i][j]);
grid[i][j].setVisible(false);
grid[i][j].addKeyListener(this);
grid[i][j].setBackground(Color.blue);
}
//蛇体初始化
grid[10][10].setVisible(true);
grid[11][10].setVisible(true);
grid[12][10].setVisible(true);
grid[13][10].setVisible(true);
grid[14][10].setVisible(true);
//在动态数组中保存蛇体按钮坐标【行列】信息
snake_list.add(new Point(10,10));
snake_list.add(new Point(11,10));
snake_list.add(new Point(12,10));
snake_list.add(new Point(13,10));
snake_list.add(new Point(14,10));
this.rand_bean();
this.setTitle("总分：0");
this.setVisible(true);
}
//该方法随机一个豆子，且不在蛇体上，并使豆子可见
public void rand_bean(){
Random rd=new Random();
do{
bean.x=rd.nextInt(20);//行
bean.y=rd.nextInt(20);//列
}while(snake_list.contains(bean));
grid[bean.x][bean.y].setVisible(true);
grid[bean.x][bean.y].setBackground(Color.red);
}
//判断拟增蛇头是否与自身有碰撞
public boolean is_cross(Point p){
boolean Flag=false;
for(int i=0;isnake_list.size();i++){
if(p.equals(snake_list.get(i) )){
Flag=true;break;
}
}
return Flag;
}
//判断蛇即将前进位置是否有豆子，有返回true，无返回false
public boolean isHaveBean(){
boolean Flag=false;
int x=snake_list.get(0).x;
int y=snake_list.get(0).y;
Point p=null;
if(Direction==1)p=new Point(x-1,y);
if(Direction==2)p=new Point(x+1,y);
if(Direction==3)p=new Point(x,y-1);
if(Direction==4)p=new Point(x,y+1);
if(bean.equals(p))Flag=true;
return Flag;
}
//前进一格
public void snake_move(){
if(isHaveBean()==true){//////////////有豆子吃
Point p=new Point(bean.x,bean.y);//【很重要，保证吃掉的是豆子的复制对象】
snake_list.add(0,p); //吃豆子
grid[p.x][p.y].setBackground(Color.blue);
this.Count++;
this.setTitle("总分："+Count);
this.rand_bean(); //再产生一个豆子
}else{///////////////////无豆子吃
//取原蛇头坐标
int x=snake_list.get(0).x;
int y=snake_list.get(0).y;
//根据蛇头坐标推算出拟新增蛇头坐标
Point p=null;
if(Direction==1)p=new Point(x-1,y);//计算出向上的新坐标
if(Direction==2)p=new Point(x+1,y);//计算出向下的新坐标
if(Direction==3)p=new Point(x,y-1);//计算出向左的新坐标
if(Direction==4)p=new Point(x,y+1);//计算出向右的新坐标
//若拟新增蛇头碰壁，或缠绕则游戏结束
if(p.x0||p.x19|| p.y0||p.y19||is_cross(p)==true){
JOptionPane.showMessageDialog(null, "游戏结束！");
System.exit(0);
}
//向蛇体增加新的蛇头坐标,并使新蛇头可见
snake_list.add(0,p);
grid[p.x][p.y].setVisible(true);
//删除原蛇尾坐标，使蛇尾不可见
int x1=snake_list.get(snake_list.size()-1).x;
int y1=snake_list.get(snake_list.size()-1).y;
grid[x1][y1].setVisible(false);
snake_list.remove(snake_list.size()-1);
}
}
@Override
public void keyPressed(KeyEvent e) {
if(e.getKeyCode()==KeyEvent.VK_UP Direction!=2) Direction=1;
if(e.getKeyCode()==KeyEvent.VK_DOWN Direction!=1) Direction=2;
if(e.getKeyCode()==KeyEvent.VK_LEFT Direction!=4) Direction=3;
if(e.getKeyCode()==KeyEvent.VK_RIGHT Direction!=3) Direction=4;
}
@Override
public void keyReleased(KeyEvent e) { }
@Override
public void keyTyped(KeyEvent e) { }
public static void main(String[] args) throws InterruptedException {
Snake win=new Snake();
while(true){
win.snake_move();
Thread.sleep(300);
}
}
}
