线程池之exectue与submit的区别及说明_Java

1、参数及返回值不同

excute只能提交runnable，无返回值
submit既可以提交runnable，返回值为null，也可以提交callable，返回值future

excute：

submit：

2、异常抛出不同

execute执行任务时遇到异常会直接抛出
submit执行任务是遇到异常不会直接抛出，只有在使用future的get方法获取返回值时才会抛出异常

execute:

import org.junit.test;
 
import java.util.concurrent.*;
 
public class threadpooldemo {
 
    @test
    public void test() throws interruptedexception, executionexception {
        //创建线程池对象
        executorservice singlethreadexecutor = executors.newsinglethreadexecutor();
        singlethreadexecutor.execute(() -> {
            system.out.println("开始");
            int i = 10 / 0;
            system.out.println("结束");
        });
    }
}

输出：

开始
exception in thread "pool-1-thread-1" java.lang.arithmeticexception: / by zero
at threadpooldemo.lambda$test$0(threadpooldemo.java:13)
at java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1149)
at java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:624)
at java.lang.thread.run(thread.java:748)

submit：

import org.junit.test;
 
import java.util.concurrent.*;
 
public class threadpooldemo {
 
    @test
    public void test() throws interruptedexception, executionexception {
        //创建线程池对象
        executorservice singlethreadexecutor = executors.newsinglethreadexecutor();
        singlethreadexecutor.submit(() -> {
            system.out.println("开始");
            int i = 10 / 0;
            system.out.println("结束");
        });
    }
}

输出：

开始

submit 增加future的get方法

import org.junit.test;
 
import java.util.concurrent.*;
 
public class threadpooldemo {
    @test
    public void test() throws interruptedexception, executionexception {
        //创建线程池对象
        executorservice singlethreadexecutor = executors.newsinglethreadexecutor();
        future future=singlethreadexecutor.submit(() -> {
            system.out.println("开始");
            int i = 10 / 0;
            system.out.println("结束");
        });
        object o=future.get();
        singlethreadexecutor.shutdown();
    }
}

输出：