1、继承Thread
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public class T4 { public static void main(String[] args) { System.out.println(Thread.currentThread()); Thread t1 = new A1(); t1.start(); } } class A1 extends Thread{ @Override public void run() { for ( int i= 0 ;i< 10 ;i++) { System.out.println( "Thread:" +Thread.currentThread().getName()); } } } |
2、实现Runnable接口
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public class T3 { public static void main(String[] args) { System.out.println( "Thread:" +Thread.currentThread().getName()); Thread t1 = new Thread( new A2()); t1.start(); } } class A2 implements Runnable{ @Override public void run() { int res = 0 ; for ( int i= 0 ;i< 10 ;i++) { res+=i; System.out.println( "Thread:" +Thread.currentThread().getName()); } } } |
3、使用Callable和Future接口创建线程
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import java.util.concurrent.Callable; import java.util.concurrent.FutureTask; public class T2 { public static void main(String[] args) throws Exception { System.out.println( "Test3:" + Thread.currentThread().getName()); Callable c = new A4(); FutureTask ft = new FutureTask(c); Thread t1 = new Thread(ft); t1.start(); Object res = ft.get(); System.out.println( "结果:" + res); } } class A4 implements Callable { @Override public Object call() throws Exception { int res = 0 ; for ( int i = 0 ; i < 10 ; i++) { res += i; System.out.println( "Thread:" + Thread.currentThread().getName()); } return res; } } |
4、使用线程池创建线程
享元模式
享元模式Flyweight Pattern主要用于减少创建对象的数量,以减少内存占用和提高性能。这种类型的设计模式属于 结构型模式,它提供了减少对象数量从而改善应用所需的对象结构的方式
优点:大大减少对象的创建,降低系统内存的使用,以提高程序的执行效率。
缺点:提高了系统的复杂度,需要分离出外部状态和内部状态,而且外部状态具有固有化的性质,不应该随着内部 状态的变化而变化,否则会造成系统的混乱。
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import java.util.concurrent.Callable; import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors; import java.util.concurrent.Future; public class T1 { public static void main(String[] args) throws Exception { Future[] arr = new Future[ 5 ]; ExecutorService es = Executors.newFixedThreadPool( 3 ); for ( int i = 0 ; i < 5 ; i++) { arr[i] = es.submit( new A4()); } for (Future f : arr) { Object res = f.get(); System.out.println( "结果为:" + res); } es.shutdown(); } } class A4 implements Callable { @Override public Object call() throws Exception { int res = 0 ; for ( int i = 0 ; i < 10 ; i++) { res += i; System.out.println( "Thread" + Thread.currentThread().getName()); } return res; } } |
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原文链接:https://blog.csdn.net/qq_45874107/article/details/113754912