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  • 多线程小知识

    package test;
    
    import java.awt.List;
    import java.awt.image.AreaAveragingScaleFilter;
    import java.lang.reflect.Array;
    import java.math.BigDecimal;
    import java.math.BigInteger;
    import java.util.*;
    import java.util.concurrent.CountDownLatch;
    import java.util.concurrent.locks.Condition;
    import java.util.concurrent.locks.Lock;
    import java.util.concurrent.locks.ReentrantLock;
    import java.io.BufferedInputStream;
    import java.io.OutputStreamWriter;
    import java.io.PrintWriter;
    import java.io.Reader;
    import java.io.Writer;
    import javax.security.auth.callback.LanguageCallback;
    import javax.swing.text.StyledEditorKit.BoldAction;
    
    
    class Re implements Runnable
    {
    	
    	@Override
    	public void run() {
    		// TODO Auto-generated method stub
    		for(int i = 1; i <= 50; i ++)
    		{
    			System.out.println(Thread.currentThread().toString() + "........" + i);
    		}
    	}
    }
    public class Main {
    
    	public static void main(String[] args) throws Exception {
    
    		Scanner scanner = new Scanner(new BufferedInputStream(System.in));
    		PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out));
    		
    		
    		new Thread(new Runnable() {
    			
    			@Override
    			public void run() {
    				System.out.println(11);
    				
    			}
    		})
    		{
    			public void run() {
    				for(int i = 1; i <= 50; i ++)
    				{
    					System.out.println(Thread.currentThread().getName() + " .......");
    				}
    			}
    		}.start();
    		
    		
    		
    		
    	}
    }
    
    我们在一个线程里面先运行子任务,若是没有子任务就运行自己的任务,自己要是没有任务就运行thread
    我们在线程里面t1.setDaemon(true);我们可以设置后台任务,后台任务的好处就是在前台任务结束之后java虚拟机就会退出
    我们还可以t1.yield();让这个线程释放执行权
    t1.setPriority(Thread.MAX_PRIORITY);这个我们可以让线程的优先级变高 cpu适当照顾一下线程
    t1.interrupt();打断线程,这个东西我们需要抛出异常
    
    package test;
    
    import java.awt.List;
    import java.awt.image.AreaAveragingScaleFilter;
    import java.lang.reflect.Array;
    import java.math.BigDecimal;
    import java.math.BigInteger;
    import java.util.*;
    import java.util.concurrent.CountDownLatch;
    import java.util.concurrent.locks.Condition;
    import java.util.concurrent.locks.Lock;
    import java.util.concurrent.locks.ReentrantLock;
    import java.io.BufferedInputStream;
    import java.io.OutputStreamWriter;
    import java.io.PrintWriter;
    import java.io.Reader;
    import java.io.Writer;
    import javax.security.auth.callback.LanguageCallback;
    import javax.swing.text.StyledEditorKit.BoldAction;
    
    
    class Re implements Runnable
    {
    	
    	@Override
    	public void run() {
    		// TODO Auto-generated method stub
    		for(int i = 1; i <= 50; i ++)
    		{
    			System.out.println(Thread.currentThread().toString() + "........" + i);
    		}
    	}
    }
    public class Main {
    
    	public static void main(String[] args) throws Exception {
    
    		Scanner scanner = new Scanner(new BufferedInputStream(System.in));
    		PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out));
    		
    		
    		new Thread(new Runnable() {
    			
    			@Override
    			public void run() {
    				System.out.println(11);
    				
    			}
    		})
    		{
    			public void run() {
    				for(int i = 1; i <= 50; i ++)
    				{
    					System.out.println(Thread.currentThread().getName() + " .......");
    				}
    			}
    		}.start();
    		
    		Thread t1 = new Thread();
    		t1.setDaemon(true);
    		t1.yield();
    		t1.setPriority(Thread.MAX_PRIORITY);
    		t1.interrupt();
    		
    	}
    }
    

      

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  • 原文地址:https://www.cnblogs.com/WINDZLY/p/11788634.html
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