急！！！java多线程

[lin243646327]

生成10000个随机数，用4个线程均分为4块怎么分啊？

[zoeg]

怎么还带强制要用几个线程的算法。。。

[huangxiaofei]

代码如下：

import java.util.*;

public class RandomGenMultiThread implements Runnable{
	private int randomNum;
	private long seed;
	private int num;
	
	public RandomGenMultiThread(int num){
		Date date = new Date();
		this.seed = date.getTime();
		this.num = num;
	}

	@Override
	public void run(){
		Random random = new Random(this.seed);
		for(int i=0;i < 25000;i++){
			this.randomNum = random.nextInt();
			System.out.println("random number "+this.randomNum+" from thread " + this.num);
		}
	}
	
	public static void main(String[] args){
		RandomGenMultiThread r1 = new RandomGenMultiThread(1);
		RandomGenMultiThread r2 = new RandomGenMultiThread(2);
		RandomGenMultiThread r3 = new RandomGenMultiThread(3);
		RandomGenMultiThread r4 = new RandomGenMultiThread(4);
		
		new Thread(r1).start();
		new Thread(r2).start();
		new Thread(r3).start();
		new Thread(r4).start();
	}
}

[赏金--猎人]

3楼正解！

[gu390154333]

public static void main(String[] args) {
		for (int i = 0; i < 4; i++) {
			Runnable task = new Runnable() {
				public void run() {
					for (int j = 0; j < 25000; j++) {
						System.out.println(new Random().nextInt(100000));
					}
				}
			};
			new Thread(task).start();
		}
	}

[onlyyou67]

顶3楼！！！！！！！！

[lee1473336489]

for (int i = 0; i <= 4; i++) {
			new Thread() {
				@Override
				public void run() {
					for (int j = 0; j < 25000; j++) {
						System.out.println(new Random().nextInt(100000));
					}
				}
			}.start();
		}

[Liangxiaotang]

四个线程，每个生成2500个；或者起四个线程；同时put；当size》10000时结束线程

[少主无翼]

顶9楼

[ro_nice]

[yanxing2012]

引用 3 楼 huangxiaofei 的回复:

代码如下： Java code?12345678910111213141516171819202122232425262728293031323334import java.util.*; public class RandomGenMultiThread implements Runnable{ private int randomNum; private……

感觉run（）方法这样写好些。。。

public void run(){
		synchronized(System.out){
			Random random = new Random(this.seed);
			for(int i=0;i < 25000;i++){
				this.randomNum = random.nextInt();
				System.out.println("random number "+this.randomNum+" from thread " + this.num);
			} 
			try {
				Thread.sleep(1000);
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
		
	}           

[huage]

public static LinkedList<Integer> arrayList = new LinkedList<Integer>() ;
	public static int MaxSize = 100000 ; 
	public static synchronized void add(int i){
	 if( arrayList.size() < MaxSize){
		    arrayList.add(i) ;
		}
	}
	public static synchronized boolean isOk(){
		if(arrayList.size()>= MaxSize)
			return false;	
		return true;
	}
	public static void main(String[] args) {
		for (int i = 0; i < 4; i++) {       
			new Thread() {           
				@Override          
				public void run() {    
					while(isOk()){ 
						add(new Random().nextInt(MaxSize)) ;
					}
				}     
			}.start();   

		}
	}

[huangxiaofei]

嗯对！我写的那个没有考虑到同步的问题，楼上两个的写法都比我那个线程更加安全

[xianwangkai]

12楼写的很精辟,学习了！

引用 11 楼 yanxing2012 的回复:

引用 3 楼 huangxiaofei 的回复:代码如下： Java code?12345678910111213141516171819202122232425262728293031323334import java.util.*; public class RandomGenMultiThread implements Runnable{ private i……

[STEEL-CHINA]

高手自在CSDN。

[-AJ-]

原来分成4块，是这个意思啊

[lin243646327]

谢谢各位了。。

[zj304292653]

一个线程生成2500个不就行了么