1.runAsync执行完后无返回值
package com.search.thread;
import java.util.concurrent.*;
public class ThreadTest {
public static ExecutorService executor = Executors.newFixedThreadPool(10);
public static void main(String[] args) throws ExecutionException, InterruptedException {
System.out.println("main......start.....");
CompletableFuture<Void> future = CompletableFuture.runAsync(() -> {
System.out.println("当前线程:" + Thread.currentThread().getId());
int i = 10 / 2;
System.out.println("运行结果:" + i);
}, executor);
}
}
2.supplyAsync执行完后有返回值,后续能感知异常
package com.search.thread;
import java.util.concurrent.*;
public class ThreadTest {
public static ExecutorService executor = Executors.newFixedThreadPool(10);
public static void main(String[] args) throws ExecutionException, InterruptedException {
/**
* 方法完成后的处理
*/
CompletableFuture<Integer> future = CompletableFuture.supplyAsync(() -> {
System.out.println("当前线程:" + Thread.currentThread().getId());
int i = 10 / 0;
System.out.println("运行结果:" + i);
return i;
}, executor).whenComplete((res,exception) -> {
//虽然能得到异常信息,但是没法修改返回数据
System.out.println("异步任务成功完成了...结果是:" + res + "异常是:" + exception);
}).exceptionally(throwable -> {
//可以感知异常,同时返回默认值
return 10;
});
}
}
3.supplyAsync执行完后有返回值,后续能感知异常
package com.search.thread;
import java.util.concurrent.*;
public class ThreadTest {
public static ExecutorService executor = Executors.newFixedThreadPool(10);
public static void main(String[] args) throws ExecutionException, InterruptedException {
/**
* 方法执行完后端处理
*/
CompletableFuture<Integer> future = CompletableFuture.supplyAsync(() -> {
System.out.println("当前线程:" + Thread.currentThread().getId());
int i = 10 / 2;
System.out.println("运行结果:" + i);
return i;
}, executor).handle((result,thr) -> {
if (result != null) {
return result * 2;
}
if (thr != null) {
System.out.println("异步任务成功完成了...结果是:" + result + "异常是:" + thr);
return 0;
}
return 0;
});
}
}
4.线程串行化,如:A任务执行完再执行B任务
package com.search.thread;
import java.util.concurrent.*;
public class ThreadTest {
public static ExecutorService executor = Executors.newFixedThreadPool(10);
public static void main(String[] args) throws ExecutionException, InterruptedException {
//1.thenRun开头的,不接受上一步(如:supplyAsync)的返回结果,thenRun执行完本身没有返回值
CompletableFuture<Void> future = CompletableFuture.supplyAsync(() -> {
System.out.println("当前线程:" + Thread.currentThread().getId());
int i = 10 / 2;
System.out.println("运行结果:" + i);
return i;
}, executor).thenRunAsync(()-> {
System.out.println("任务2启动了...");
},executor);
// 2.thenAccept开头的,需要接受上一步(如:supplyAsync)的返回结果,thenAccept执行完本身也没有返回值
CompletableFuture<Void> future = CompletableFuture.supplyAsync(() -> {
System.out.println("当前线程:" + Thread.currentThread().getId());
int i = 10 / 2;
System.out.println("运行结果:" + i);
return i;
}, executor).thenAcceptAsync(res -> {
System.out.println("任务2启动了..." + res);
}, executor);
// 3.thenApply开头的,需要上一步(如:supplyAsync)的返回结果,thenApply执行完本身最终会有返回值
CompletableFuture<String> future = CompletableFuture.supplyAsync(() -> {
System.out.println("当前线程:" + Thread.currentThread().getId());
int i = 10 / 2;
System.out.println("运行结果:" + i);
return i;
}, executor).thenApplyAsync(res -> {
System.out.println("任务2启动了..." + res);
return "Hello" + res;
}, executor);
}
}
5.两任务组合 - 如:A、B两任务都要完成再执行另一个任务C
package com.search.thread;
import java.util.concurrent.*;
public class ThreadTest {
public static ExecutorService executor = Executors.newFixedThreadPool(10);
public static void main(String[] args) throws ExecutionException, InterruptedException {
// thenApply开头的,需要上一步(如:supplyAsync)的返回结果,thenApply执行完本身最终会有返回值
CompletableFuture<String> future01 = CompletableFuture.supplyAsync(() -> {
System.out.println("当前线程:" + Thread.currentThread().getId());
int i = 10 / 2;
System.out.println("运行结果:" + i);
return i;
}, executor).thenApplyAsync(res -> {
System.out.println("任务2启动了..." + res);
return "Hello" + res;
}, executor);
CompletableFuture<Integer> future02 = CompletableFuture.supplyAsync(() -> {
System.out.println("当前线程:" + Thread.currentThread().getId());
int i = 10 / 2;
System.out.println("运行结果:" + i);
return i;
}, executor);
//1.future01和future02执行完成后再执行自己的,不接受future01和future02的返回值,执行完自己的也没有返回值
future01.runAfterBothAsync(future02,()->{
System.out.println("任务3开始...");
},executor);
//2.future01和future02执行完成后再执行自己的,接受future01和future02的返回值,执行完自己的是没有返回值的
future01.thenAcceptBothAsync(future02,(f1,f2)-{
System.out.println("任务3开始...之前的返回结果:"+f1+"-->"+f2);
},executor);
//3.future01和future02执行完成后再执行自己的,接受future01和future02的返回值,执行完自己的是有返回值的
CompletableFuture<String> future = future01.thenCombineAsync(future02, (f1, f2) ->(
return f1 +":" + f2 +" -> Haha";
},executor);
System.out.println("main....end...."+future.get());
}
}
6.两任务组合 - 如:A、B两任务只要有一个完成就执行另一个任务C
package com.search.thread;
import java.util.concurrent.*;
public class ThreadTest {
public static ExecutorService executor = Executors.newFixedThreadPool(10);
public static void main(String[] args) throws ExecutionException, InterruptedException {
// thenApply开头的,需要上一步(如:supplyAsync)的返回结果,thenApply执行完本身最终会有返回值
CompletableFuture<Object> future01 = CompletableFuture.supplyAsync(() -> {
System.out.println("当前线程:" + Thread.currentThread().getId());
int i = 10 / 2;
System.out.println("运行结果:" + i);
return i;
}, executor).thenApplyAsync(res -> {
System.out.println("任务2启动了..." + res);
return "Hello" + res;
}, executor);
CompletableFuture<Object> future02 = CompletableFuture.supplyAsync(() -> {
System.out.println("当前线程:" + Thread.currentThread().getId());
int i = 10 / 2;
System.out.println("运行结果:" + i);
return i;
}, executor);
//1.future01或future02有一个执行完成后再执行自己的任务,不接受future01和future02的返回值,执行完自己的也没有返回值
future01.runAfterEitherAsync(future02,()->{
System.out.println("任务3开始...");
},executor);
//2.future01或future02有一个执行完成后再执行自己的任务,接受future01和future02的返回值(返回类型要相同),执行完自己的是没有返回值的
future01.acceptEitherAsync(future02,(res)->{
System.out.printn("任务3开始...之前的结果:"+res);
},executor);
//3.future01或future02有一个执行完成后再执行自己的,接受future01和future02的返回值,执行完自己的是有返回值的
CompletableFuture<String> future = future01.applyToEitherAsync(future02, res ->{
System.out.println("任务3开始...之前的结果: + res");
return res.toString() +"->哈哈"
};executor)
System.out.printIn("main....end..."+future .get());
}
}
7.多任务组合 - 等待全部完成和只要有一个任务完成
allOf:等待所有任务完成
anyOf:只要有一个任务完成
package com.search.thread;
import java.util.concurrent.*;
public class ThreadTest {
public static ExecutorService executor = Executors.newFixedThreadPool(10);
public static void main(String[] args) throws ExecutionException, InterruptedException {
CompletableFuture<String> futureImg= CompletableFuture.supplyAsync(() -> {
System.out.println("查询商品的图片信息");
return "hello.jpg";
});
CompletableFuture<String> futureAttr = CompletableFuture.supplyAsync(() -> {
System.out.printIn("查询商品的属性");
return "黑色+256G";
});
CompletableFuture<String> futureDesc = CompletableFuture.supplyAsync(() -> {
try {
Thread.sleep(3000);
System.out.println("查询商品介绍");
}catch (InterruptedException e) {
e.printStackTrace();
}
return"华为";
});
CompletableFuture<Void> all0f = CompletableFuture.allof(futureImg, futureAttr, futureDesc);
allof.get();//等待所有结果完成
System.out.printIn("main,.,end...,"+futureImg.get()+"=>"+futureAttr.get()+"=>"+futureDesc.get());
CompletableFuture<0bject> anyof = CompletableFuture.any0f(futureImg, futureAttr, futureDesc
anyof.get();//等待所有结果完成
System.out.printIn("main,.,end...,"+anyof.get());
}
}