学习笔记线程的创建方式

刺骨的言语ヽ痛彻心扉 2021-11-04 14:34 259阅读 0赞

### 学习笔记 ###

*   *  5、线程池

多线程创建方式

1.继承Thread类，重写run方法

public class a extends Thread{
    	public void run() {
    		while(true) {
    			try {
    				sleep(50);
    			} catch (InterruptedException e) {
    				// TODO Auto-generated catch block
    				e.printStackTrace();
    			}
    			System.out.println("旭旭520");
    		}
    	}`
    	
    
    	public static void main(String[] args) {
    		new a().start();
    		new b().start();
    		new c().start();
    	}
    	
    }
     class b extends Thread{
    	public void run() {
    		while(true) {
    			try {
    				sleep(50);
    			} catch (InterruptedException e) {
    				// TODO Auto-generated catch block
    				e.printStackTrace();
    			}
    			System.out.println("xx520");
    		}
    	}
    }
     class c extends Thread{
    	public void run() {
    		while(true) {
    			try {
    				sleep(50);
    			} catch (InterruptedException e) {
    				// TODO Auto-generated catch block
    				e.printStackTrace();
    			}
    			System.out.println("zz520");
    		}
    	}
    }

执行结果：  
旭旭520  
zz520  
xx520  
旭旭520  
zz520  
xx520  
旭旭520  
zz520  
xx520  
旭旭520  
xx520  
zz520  
旭旭520  
xx520  
zz520  
旭旭520  
xx520  
zz520

2.实现Runnable接口，重写run()方法，将类的实例作为Thread的参数

public class a implements Runnable {
    	public void run() {
    		while (true) {
    			try {
    				Thread.sleep(50);
    			} catch (InterruptedException e) {
    				// TODO Auto-generated catch block
    				e.printStackTrace();
    			}
    			System.out.println("旭旭520");
    		}
    	}
    	public static void main(String[] args) {
    		new Thread(new a()).start();
    		new Thread(new b()).start();
    		new Thread(new c()).start();
    	}
    }
    
    class b implements Runnable {
    	public void run() {
    		while (true) {
    			try {
    				Thread.sleep(50);
    			} catch (InterruptedException e) {
    				// TODO Auto-generated catch block
    				e.printStackTrace();
    			}
    			System.out.println("xx520");
    		}
    	}
    }
    
    class c implements Runnable {
    	public void run() {
    		while (true) {
    			try {
    				Thread.sleep(50);
    			} catch (InterruptedException e) {
    				// TODO Auto-generated catch block
    				e.printStackTrace();
    			}
    			System.out.println("zz520");
    		}
    	}
    
    	
    }

执行结果：  
旭旭520  
zz520  
xx520  
旭旭520  
zz520  
旭旭520  
xx520  
zz520  
旭旭520  
xx520  
zz520  
xx520  
旭旭520

3.实现Callable接口，重写call方法将实现了Callable的类的一个实例作为FutureTask的参数，再将一个FutureTask的实例作为Thread的参数

import java.util.concurrent.Callable;
    import java.util.concurrent.FutureTask;
    public class a implements Callable<String> {
    	public String call() {
    		while (true) {
    			try {
    				Thread.sleep(50);
    			} catch (InterruptedException e) {
    				// TODO Auto-generated catch block
    				e.printStackTrace();
    			}
    			System.out.println("zz520");
    		}
    	}
    	public static void main(String[] args) {
    		Callable<String> c1 = new a();
    		FutureTask<String> f1 = new FutureTask<String>(c1);
    		new Thread(f1).start();
    		Callable<String> c2 = new b();
    		FutureTask<String> f2 = new FutureTask<String>(c2);
    		new Thread(f2).start();
    		Callable<String> c3 = new c();
    		FutureTask<String> f3 = new FutureTask<String>(c3);
    		new Thread(f3).start();
    	}
    }
    class b implements Callable<String> {
    	public String call() {
    		while (true) {
    			try {
    				Thread.sleep(50);
    			} catch (InterruptedException e) {
    				// TODO Auto-generated catch block
    				e.printStackTrace();
    			}
    			System.out.println("旭旭520");
    		}
    	}
    }
    class c implements Callable<String> {
    	public String call() {
    		while (true) {
    			try {
    				Thread.sleep(50);
    			} catch (InterruptedException e) {
    				// TODO Auto-generated catch block
    				e.printStackTrace();
    			}
    			System.out.println("xx520");
    		}
    	}
    }

执行结果：  
旭旭520  
xx520  
zz520  
旭旭520  
xx520  
旭旭520  
zz520  
xx520  
zz520  
旭旭520  
xx520

4.使用线程池Executors类，使用ExecutorService e = Executors.newFixedThreadPool(5);再使用e.submit方法将实现了Runable接口的实例执行线程

import java.util.concurrent.ExecutorService;
    import java.util.concurrent.Executors;
    public class a implements Runnable {
    	public void run() {
    		while (true) {
    			try {
    				Thread.sleep(50);
    			} catch (InterruptedException e) {
    				// TODO Auto-generated catch block
    				e.printStackTrace();
    			}
    			System.out.println("xx520");
    		}
    	}
    	public static void main(String[] args) {
    		ExecutorService e = Executors.newFixedThreadPool(5);
    		e.submit(new a());
    		e.submit(new b());
    		e.submit(new c());
    	}
    }
    class b implements Runnable {
    	public void run() {
    		while (true) {
    			try {
    				Thread.sleep(50);
    			} catch (InterruptedException e) {
    				// TODO Auto-generated catch block
    				e.printStackTrace();
    			}
    			System.out.println("旭旭520");
    		}
    	}
    }
    class c implements Runnable {
    	public void run() {
    		while (true) {
    			try {
    				Thread.sleep(50);
    			} catch (InterruptedException e) {
    				// TODO Auto-generated catch block
    				e.printStackTrace();
    			}
    			System.out.println("zz520");
    		}
    	}
    }

执行结果：  
zz520  
xx520  
旭旭520  
zz520  
xx520  
旭旭520  
xx520  
zz520  
zz520  
xx520  
旭旭520

## 5、线程池 ##

ThreadPoolExecutor threadPoolExecutor = new ThreadPoolExecutor(1, 10, 1000, TimeUnit.MILLISECONDS, new PriorityBlockingQueue<Runnable>(), Executors.defaultThreadFactory(), new ThreadPoolExecutor.AbortPolicy());
            threadPoolExecutor.execute(new AlertBug());