线程新建

ThreadLocal的详解： https://www.cnblogs.com/dolphin0520/p/3920407.html

新建线程的几种方法

1、继承Thread类

2、实现Runnable接口

3、实现Callable接口，配合FutureTask，最后的返回结果会在FutureTask对象的get方法中

代码中有些怪异的原因是因为内部类是动态的，也就是开头以public class开头。而主程序是public static class main。在Java中，类中的静态方法不能直接调用动态方法。只有将某个内部类修饰为静态类，然后才能够在静态类中调用该类的成员变量与成员方法。所以解决办法是将public class改为public static class. 或者改成的new test().new thread():

class test  
{	
	public static void main (String[]  args){
		System.out.println("test -main");
		//***************************************
		new Thread(new  Runnable() {
			public void run() {
				System.out.println("test -main -thread 111");
			}
		}).start();
		//***************************************
		new test().new Thread2().start();	
		//***************************************
		new Thread(new test().new Thread3()).start();
		//***************************************
		FutureTask<Integer> futureTask = new FutureTask<>(new test().new Thread4());
		new Thread(futureTask).start();
		try {
			System.out.println("test -main -thread 444 result:" + futureTask.get());
		} catch (Exception e) {
			System.out.println("futureTask.get() erro" );
			e.printStackTrace();
		} 
	}
	
	public class Thread2 extends Thread{
		 public void run() {
			 System.out.println("test -main -thread 222");
		 }
	 }
	
	public class Thread3 implements Runnable{
		@Override
		public void run() {
			// TODO Auto-generated method stub
			 System.out.println("test -main -thread 333");
		}
	}
	
	public class Thread4 implements Callable<Integer>{
		@Override
		public Integer call() throws Exception {
			System.out.println("test -main -Thread 444");
			return 100;
		}
	}
}

打印结果：

test -main
test -main -thread 111
test -main -thread 222
test -main -thread 333
test -main -Thread 444
test -main -thread 444 result:100

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