本文實(shí)例為大家分享了Java實(shí)現(xiàn)多線程的三種方式，供大家參考，具體內(nèi)容如下
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 | import java.util.concurrent.Callable;import java.util.concurrent.FutureTask;public class Main { public static void main(String[] args) { //方法一：繼承Thread int i = 0;// for(; i < 100; i++){// System.out.println(Thread.currentThread().getName() + " " + i);// if (i == 5) {// ThreadExtendsThread threadExtendsThread = new ThreadExtendsThread();// threadExtendsThread.start();// }// } //方法二：實(shí)現(xiàn)Runnable// for(i = 0; i < 100; i++){// System.out.println(Thread.currentThread().getName() + " " + i);// if (i == 5) {// Runnable runnable = new ThreadImplementsRunnable();// new Thread(runnable).start();// new Thread(runnable).start();// }// } //方法三：實(shí)現(xiàn)Callable接口 Callable<Integer> callable = new ThreadImplementsCallable(); FutureTask<Integer> futureTask = new FutureTask<>(callable); for(i = 0; i < 100; i++){ System.out.println(Thread.currentThread().getName() + " " + i); if (i == 5) { new Thread(futureTask).start(); new Thread(futureTask).start(); } } try { System.out.println("futureTask ruturn: " + futureTask.get()); } catch (Exception e) { e.printStackTrace(); } }} |
方法一，繼承自Thread
1 2 3 4 5 6 7 8 9 | public class ThreadExtendsThread extends Thread { private int i; @Override public void run() { for(; i < 100; i++) { System.out.println(getName() + " " + i); } }} |
run方法為線程執(zhí)行體，ThreadExtendsThread對象即為線程對象。
方法二，實(shí)現(xiàn)Runnable接口
1 2 3 4 5 6 7 8 9 | public class ThreadImplementsRunnable implements Runnable { private int i; @Override public void run() { for(; i < 100; i++){ System.out.println(Thread.currentThread().getName() + " " + i); } }} |
run方法為線程執(zhí)行體，使用時(shí)New一個(gè)Thread對象，Runnable對象作為target傳遞給Thread對象。且同一個(gè)Runnable對象可作為多個(gè)Thread的target，這些線程均共享Runnable對象的實(shí)例變量。
方法三，實(shí)現(xiàn)Callable接口
1 2 3 4 5 6 7 8 9 10 11 12 13 | import java.util.concurrent.Callable;public class ThreadImplementsCallable implements Callable<Integer> { private int i; @Override public Integer call() throws Exception { for(; i < 100; i++){ System.out.println(Thread.currentThread().getName() + " " + i); } return i; }} |
Callable接口類似于Runnable接口，但比對方強(qiáng)大，線程執(zhí)行體為call方法，該方法具有返回值和可拋出異常。使用時(shí)將Callable對象包裝為FutureTask對象，通過泛型指定返回值類型。可稍候調(diào)用FutureTask的get方法取回執(zhí)行結(jié)果。
以上就是本文的全部內(nèi)容，希望對大家的學(xué)習(xí)有所幫助。
