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package com.zhuq;
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public class Apple extends Fruit{
@Override
public void eat() {
System.out.println("吃苹果");
}
@Override
public void shape() {
System.out.println("苹果形状");
}
}
class Banana extends Fruit{
@Override
public void eat() {
System.out.println("吃香蕉");
}
@Override
public void shape() {
System.out.println("香蕉形状");
}
}
class Orange extends Fruit{
@Override
public void eat() {
System.out.println("吃橘子");
}
@Override
public void shape() {
System.out.println("橘子形状");
}
}
abstract class Fruit{
abstract void eat();
abstract void shape();
public void String(){
this.eat();
this.shape();
}
}
/** */
public class Game {
public static Fruit 中奖(){
Integer i =(int) (Math.random()*3);
Fruit f=null;
switch (i){
case 0: f=new Apple();break;
case 1: f=new Banana();break;
case 2:f=new Orange();break;
}
return f;
}
}
/** */
public class Zhuq{
public static void main(String[] args) {
Fruit[] fruits = {null,null,null,null,null,null,null,null,null,null} ;
for(int m=0;m10;m++){
fruits[m] =Game.中奖();
}
for (int i = 0; i fruits.length; i++) {
fruits[i].String();
}
}
}
水果类
abstract public class Fruit {
abstract public double getWeight();
}
苹果类
public class Apple extends Fruit {
private double weight;
public Apple(double weight) {
this.weight = weight;
}
@Override
public double getWeight() {
return weight;
}
}
橘子类
public class Orange extends Fruit {
private double weight;
public Orange(double weight) {
this.weight = weight;
}
@Override
public double getWeight() {
return weight;
}
}
桃子类
public class Peach extends Fruit {
private double weight;
public Peach(double weight) {
this.weight = weight;
}
@Override
public double getWeight() {
return weight;
}
}
主类
public class Main {
public static void main(String[] args) {
// TODO Auto-generated method stub
Fruit[] fruits = { new Peach(12), new Apple(2), new Orange(5) };
for (Fruit fruit : fruits) {
System.out.println(fruit.getClass().getName() + "的重量是"
+ fruit.getWeight());
}
}
}
运行结果
Peach的重量是 12.0
Apple的重量是 2.0
Orange的重量是 5.0
public class Fruit {
String[] fruits=new String[5];
public void inputfruit(){
Scanner input=new Scanner(System.in);
for(int i=0;ifruits.length;i++){
System.out.print("请输入第"+(i+1)+"种水果:");
fruits[i]=input.next();
}
}
public String[] getNames(){
Arrays.sort(fruits);
return fruits;
}
}
public static void main(String[] args) {
// TODO Auto-generated method stub
Fruit sg=new Fruit();
String[] newFruits=new String[5];
sg.inputfruit();
newFruits=sg.getNames();
System.out.println("这些水果在字典种出现的顺序是:");
for(int i=0;inewFruits.length;i++){
if(newFruits[i]!=null){
System.out.print(newFruits[i]+"\t");
}
}
}
需要使用多线程
package org.xuyh.design;
import java.util.Scanner;
/**
* N个苹果放到20个袋子中，操作时间为4个小时，其中每个袋子的各苹果放入时间间隙大于30分钟
* @author XuYanhang
*
*/
public class AppleOperation implements Runnable{
public static final int ONE_SECOND = 1000;
private final int[] packages;
public final int operationTime;
public final int minSpacetTime;
private int appleCount;
private boolean timeEnd = false;
public AppleOperation(int appleCount,int packCount,int operationTime,int minSpacetTime){
this.appleCount = appleCount;
packages = new int[packCount];
this.operationTime = operationTime;
this.minSpacetTime = minSpacetTime;
}
public int getAppleCount(){
return appleCount;
}
public int getPackCount(){
return packages.length;
}
public int getOperationTime(){
return operationTime;
}
public boolean hasEnd(){
return timeEnd || appleCount == 0;
}
public synchronized void setTimeEnd(){
timeEnd = true;
}
public void run() {
int pack = Integer.parseInt(Thread.currentThread().getName());
while(appleCount0){
synchronized(this){
if(hasEnd()){
break;
}
appleCount--;
packages[pack]++;
System.out.println("一个苹果放入了第"+(pack+1)+"个袋子中，还剩"+appleCount+"个苹果");
}
for(int i = 0 ; i minSpacetTime ; i++){
synchronized(this){
if(hasEnd()){
break;
}
}
try {
Thread.sleep(ONE_SECOND);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
synchronized(this){
System.out.println("第"+(pack+1)+"个袋子最终有"+packages[pack]+"个苹果");
}
}
//Test main method
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
int appleCount = -1;
do{
System.out.print("N个苹果放到20个袋子中，操作时间为4个小时，其中每个袋子的各苹果放入时间间隙大于30分钟。\n"
+ "输入苹果总数N：");
String string = scanner.next();
if(null != string string.matches("^\\d{1,8}$")){
appleCount = Integer.parseInt(string);
}
}while(appleCount == -1);
scanner.close();
AppleOperation operation = new AppleOperation(appleCount,20,4*60*60,30*60);
new WaitThread(operation).start();
for (int i = 0; i operation.getPackCount(); i++) {
Thread thread = new Thread(operation,""+i);
thread.start();
}
}
static class WaitThread extends Thread{
private AppleOperation operation;
public WaitThread(AppleOperation operation){
this.operation = operation;
}
public void run(){
try {
Thread.sleep(operation.getOperationTime()*ONE_SECOND);
} catch (InterruptedException e) {
e.printStackTrace();
}
operation.setTimeEnd();
System.out.println("时间到，苹果装袋操作结束，最后为装袋的苹果个数："+operation.getAppleCount());
}
}
}
这里我们额外启动了21个线程，其中一个是计4小时的定时的，其他20个是向每个袋子中放苹果的线程。