java多线程

java多线程的实现方式：
1、继承Thread

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public Thread(Runnable target) {
 init(null, target, "Thread-" + nextThreadNum(), 0);
 }

2、实现Runable

这是Runable的源码所以Runable需要重写run方法

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<font style="color:rgb(79, 79, 79)"><font face="&quot"><font style="font-size:16px">@FunctionalInterface[/size][/font][/color][/p]public interface Runnable {
    /**
     * When an object implementing interface <code>Runnable</code> is used
     * to create a thread, starting the thread causes the object's
     * <code>run</code> method to be called in that separately executing
     * thread.
     * <p>
     * The general contract of the method <code>run</code> is that it may
     * take any action whatsoever.
     *
     * @see     java.lang.Thread#run()
     */
    public abstract void run();
}
</font></font></font>

3、接口通过FutureTask包装器来创建Thread线程

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特点：可以返回值
 
public class FutureTask<V> implements RunnableFuture<V> 
public interface RunnableFuture<V> extends Runnable, Future<V> {
使用Callable方式，需要Futertask的支持
 
    public FutureTask(Callable<V> callable) {
    if (callable == null)
        throw new NullPointerException();
    this.callable = callable;
    this.state = NEW;       // ensure visibility of callable
}