java原来接口可以直接new_java接口可以new吗-优快云博客

本文通过实例解析了Java中ExecutorService接口的使用方法，展示了如何通过匿名内部类实现接口，深入理解多线程编程。文章强调了实践的重要性，而非单纯的记忆。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

再看java多线程的时候，看到ExecutorService，点了一下回车，一看是个接口直接就给我new出了，当时就懵逼，是那个老师告诉我接口不可以直接new的。下面是我的代码A,B都是接口，c是main方法

package Multi;

public interface A {
	void execute(Runnable command);
}

package Multi;

import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;

public interface B  extends A{
	 void shutdown();
	 List<Runnable> shutdownNow();
	 boolean isShutdown();
	 boolean isTerminated();
	 boolean awaitTermination(long timeout, TimeUnit unit)
		        throws InterruptedException;
	 <T> Future<T> submit(Callable<T> task);
}

package Multi;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
public class C {
	public static void main(String[] args) {
	  A a=	new B() {
			@Override
			public void execute(Runnable command) {
				// TODO Auto-generated method stub
				
			}

			@Override
			public void shutdown() {
				// TODO Auto-generated method stub
				
			}

			@Override
			public List<Runnable> shutdownNow() {
				// TODO Auto-generated method stub
				return null;
			}

			@Override
			public boolean isShutdown() {
				// TODO Auto-generated method stub
				return false;
			}

			@Override
			public boolean isTerminated() {
				// TODO Auto-generated method stub
				return false;
			}

			@Override
			public boolean awaitTermination(long timeout, TimeUnit unit) throws InterruptedException {
				// TODO Auto-generated method stub
				return false;
			}

			@Override
			public <T> Future<T> submit(Callable<T> task) {
				// TODO Auto-generated method stub
				return null;
			}

	};
	}

}

感悟：学习不能强行记忆，实践才是硬道理