java 线程传参 方式

第一类：主动向线程传参

public class ThreadTest extends Thread {

    public ThreadTest() {
	}
	/**
	 *  第一种通过构造方法来传递参数
	 */
	public ThreadTest(String parameter ) {
		this.parameter  = parameter ;
	}

	/**
	 * 第二种通过变量传参
	 */
    private String parameter ;

	public void setParameter(String parameter) {
		this.parameter  = parameter ;
	} 

	@Override
	public void run() {
		System.out.println("hello " + parameter );
	}

	public static void main(String[] args) {
		Thread thread1 = new ThreadTest("world");
		Thread thread2= new ThreadTest();

		((ThreadTest) thread2).setParameter("beautiful girl");
		thread1.start();
		thread2.start();
	}
}

注：Thread 中有些许内置方法，例如setName(String name)、setPriority(int newPriority)等，所以在利用变量传参时，变量应避免取此类名称。

第二类 线程主动获取参数

import java.util.Random;

class Data{
	int value = 0;
}

class Work{
	public void process(Data data, Integer[] numbers) {
		for (int n : numbers) {
			data.value += n;
		}
	}
}
public class ThreadTest extends Thread {

	private Work work;

	public ThreadTest(Work work){
		this.work = work;
	}

	public void run() {
		Random random = new Random();
		Data data = new Data();
		int n1 = random.nextInt(1000);
		int n2 = random.nextInt(2000);
		int n3 = random.nextInt(3000);
		Integer[] numbers = {n1,n2,n3};
		work.process(data, numbers); // 使用回调函数
		System.out.println(String.valueOf(n1) + "+" + String.valueOf(n2) + "+" + String.valueOf(n3) + "=" + data.value);
	}

	public static void main(String[] args) {
		Thread thread = new ThreadTest(new Work());
		thread.start();

	}
}

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