通过实例解析synchronized和lock区别

package com.demo.lock;

import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

class ShareResource{
  int number = 1;
  private Lock lock = new ReentrantLock();
  
  private Condition c1 = lock.newCondition();
  private Condition c2 = lock.newCondition();
  private Condition c3 = lock.newCondition();
  
  public void print5(){
    lock.lock();
    try {
      while(number!=1){
        c1.await();
      }
      for(int i=1;i<=5;i++){
        System.out.println(Thread.currentThread().getName()+"\t"+i);
      }
      number = 2;
      c2.signal();
    } catch (Exception e) {
      e.printStackTrace();
    }finally{
      lock.unlock();
    }
  }
  
  public void print10(){
    lock.lock();
    try {
      while(number!=2){
        c2.await();
      }
      for(int i=1;i<=10;i++){
        System.out.println(Thread.currentThread().getName()+"\t"+i);
      }
      number = 3;
      c3.signal();
    } catch (Exception e) {
      e.printStackTrace();
    }finally{
      lock.unlock();
    }
  }
  
  public void print15(){
    lock.lock();
    try {
      while(number!=3){
        c3.await();
      }
      for(int i=1;i<=15;i++){
        System.out.println(Thread.currentThread().getName()+"\t"+i);
      }
      number = 1;
      c1.signal();
    } catch (Exception e) {
      e.printStackTrace();
    }finally{
      lock.unlock();
    }
  }
}
public class TestReentrantLock {

  public static void main(String[] args) {
    ShareResource shareResource = new ShareResource();
    
    new Thread(()->{
      for(int i=1;i<=10;i++){
        shareResource.print5();
      }
    },"AA").start();
    
    new Thread(()->{
      for(int i=1;i<=10;i++){
        shareResource.print10();
      }
    },"BB").start();
    
    new Thread(()->{
      for(int i=1;i<=10;i++){
        shareResource.print15();
      }
    },"CC").start();
  }
}