【摘要】 (4) 面试题-三个线程打印三个数组批次打印
a.LockSupport来打印
package com.lcz.thread;

import java.util.concurrent.locks.LockSupport;

public class Test13 {
// 三个线程
static Thread t1 = null,t2 = null,t3=nu…

(4) 面试题-三个线程打印三个数组批次打印

a.LockSupport来打印

package com.lcz.thread;

import java.util.concurrent.locks.LockSupport;

public class Test13 {
	// 三个线程
	static Thread t1 = null,t2 = null,t3=null;
	public static void main(String[] args) { char[] a1 = "123".toCharArray();
		char[] a2 = "abc".toCharArray();
		char[] a3 = "ABC".toCharArray();
		// 开始
		t1 = new Thread(()->{ for(char c:a1) { LockSupport.park(); System.out.println(Thread.currentThread().getName()+":"+c); LockSupport.unpark(t2); } },"t1"); t2 = new Thread(()->{ for(char c:a2) { LockSupport.park(); System.out.println(Thread.currentThread().getName()+":"+c); LockSupport.unpark(t3); } },"t2"); t3 = new Thread(()->{ for(char c:a3) { LockSupport.park(); System.out.println(Thread.currentThread().getName()+":"+c); LockSupport.unpark(t1); } },"t3"); t1.start();
		t2.start();
		t3.start(); LockSupport.unpark(t1);
	}
}
  
 
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b.reetrantlock+condition来打印

package com.lcz.thread;

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.LockSupport;
import java.util.concurrent.locks.ReentrantLock;

public class Test13 {
	// 三个线程
	static Thread t1 = null,t2 = null,t3=null;
	public static void main(String[] args) { char[] a1 = "123".toCharArray();
		char[] a2 = "abc".toCharArray();
		char[] a3 = "ABC".toCharArray(); ReentrantLock lock = new ReentrantLock();
		Condition condition = lock.newCondition(); // 开始
		t1 = new Thread(()->{ try { lock.lock(); for(char c:a1) { System.out.println(Thread.currentThread().getName()+":"+c); condition.signal(); condition.await(); } condition.signal(); } catch (Exception e) { e.printStackTrace(); }finally { lock.unlock(); }
		},"t1"); t2 = new Thread(()->{ try { lock.lock(); for(char c:a2) { System.out.println(Thread.currentThread().getName()+":"+c); condition.signal(); condition.await(); } condition.signal(); } catch (Exception e) { e.printStackTrace(); }finally { lock.unlock(); }
		},"t2"); t3 = new Thread(()->{ try { lock.lock(); for(char c:a3) { System.out.println(Thread.currentThread().getName()+":"+c); condition.signal(); condition.await(); } condition.signal(); } catch (Exception e) { e.printStackTrace(); }finally { lock.unlock(); }
		},"t3"); t1.start();
		t2.start();
		t3.start(); }
}
  
 
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c.乐观锁来实现（Enum来实现）

package com.lcz.thread;
// 枚举类
enum MyThreadRun{
	t1,t2,t3
}
public class Test14 {
	static volatile MyThreadRun r = MyThreadRun.t1;
	public static void main(String[] args) {
		char[] a1 = "123".toCharArray();
		char[] a2 = "abc".toCharArray();
		char[] a3 = "ABC".toCharArray(); Thread t1 = new Thread(()->{ //打印 for(char c:a1) { while(r!=MyThreadRun.t1) { } System.out.print(Thread.currentThread().getName()+":"+c); r = MyThreadRun.t2; }
		},"t1"); Thread t2 = new Thread(()->{ //打印 for(char c:a2) { while(r!=MyThreadRun.t2) { } System.out.print(Thread.currentThread().getName()+":"+c); r = MyThreadRun.t3; }
		},"t2"); Thread t3 = new Thread(()->{ //打印 for(char c:a3) { while(r!=MyThreadRun.t3) { } System.out.print(Thread.currentThread().getName()+":"+c); r = MyThreadRun.t1; }
		},"t3"); t1.start();
		t2.start();
		t3.start(); }
}
  
 
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