java并发包之Callable

package com.wjz.demo;

import java.util.concurrent.Callable;

public class CallableDemo {

    public static void main(String[] args) {
        try {
            Callable<String> call = new Callable<String>() {
                @Override
                public String call() throws Exception {
                    return "hello world!";
                }
            };
            System.out.println(call.call());
            
            Runnable run = new Runnable() {
                @Override
                public void run() {
                    System.out.println("hello world!");
                }
            };
            run.run();
        } catch (Exception e) {
            // 
        }
    }
}