线程锁的常见几种情况

于 2019-04-23 13:34:06 发布
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分类专栏： JavaSE 文章标签： 百知教育 娟姐
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本文链接：https://blog.youkuaiyun.com/Java_lover_zpark/article/details/89470666
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线程锁的几种情况

  1. 两个普通同步方法，两个线程：

    public class TestSynchronized {
	public static void main(String[] args) throws InterruptedException {
		final Number number = new Number();		
		//启动一个线程
		new Thread(new Runnable() {
			public void run() {
				number.getOne();
			}
		}).start();
		Thread.sleep(100);
		//启动一个线程
		new Thread(new Runnable() {
			public void run() {
				number.getTwo();
			}
		}).start();
	}
}
class Number{
	public synchronized void getOne(){
		System.out.println("one...");
	}
	public synchronized void getTwo(){
		System.out.println("two...");
	}
}

    打印输出结果：

    one 
two

  2. 在getOne方法中添加Thread.sleep(3000):

    public class TestSynchronized {
	public static void main(String[] args) throws InterruptedException {
		final Number number = new Number();
		
		//启动一个线程
		new Thread(new Runnable() {
			public void run() {
				number.getOne();
			}
		}).start();
		Thread.sleep(100);
		//启动一个线程
		new Thread(new Runnable() {
			public void run() {
				number.getTwo();
			}
		}).start();
	}
}
class Number{
	public synchronized void getOne(){
		try {
			Thread.sleep(3000);
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
		System.out.println("one...");
	}
	public synchronized void getTwo(){
		System.out.println("two...");
	}
}

    打印输出结果：

    one
two

  3. 添加非同步方法getThree ,开启线程并调用：

    public class TestSynchronized {
	public static void main(String[] args) throws InterruptedException {
		final Number number = new Number();
		
		//启动一个线程
		new Thread(new Runnable() {
			public void run() {
				number.getOne();
			}
		}).start();
		Thread.sleep(100);
		//启动一个线程
		new Thread(new Runnable() {
			public void run() {
				number.getTwo();
			}
		}).start();
		new Thread(new Runnable() {
			public void run() {
				number.getThree();
			}
		}).start();
	}
}
class Number{
	public synchronized void getOne(){
		try {
			Thread.sleep(3000);
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
		System.out.println("one...");
	}
	public synchronized void getTwo(){
		System.out.println("two...");
	}
	public void getThree(){
		System.out.println("three...");
	}
}

    打印输出结果：

    three
one
two

  4. 两个同步方法，两个Number对象，分别开启线程调用不同的Number中的方法：

    public class TestSynchronized {
	public static void main(String[] args) throws InterruptedException {
		final Number number = new Number();
		final Number number2=new Number();
		//启动一个线程
		new Thread(new Runnable() {
			public void run() {
				number.getOne();
			}
		}).start();
		Thread.sleep(100);
		//启动一个线程
		new Thread(new Runnable() {
			public void run() {
				number2.getTwo();
			}
		}).start();
		
	}
}
class Number{
	public synchronized void getOne(){
		try {
			Thread.sleep(3000);
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
		System.out.println("one...");
	}
	public synchronized void getTwo(){
		System.out.println("two...");
	}
	public void getThree(){
		System.out.println("three...");
	}
}

    打印输出结果：

    two
one

  5. 将getOne修改为静态同步方法，getTwo为普通同步方法：

    public class TestSynchronized {
	public static void main(String[] args) throws InterruptedException {
		final Number number = new Number();
		
		//启动一个线程
		new Thread(new Runnable() {
			public void run() {
				number.getOne();
			}
		}).start();
		Thread.sleep(100);
		//启动一个线程
		new Thread(new Runnable() {
			public void run() {
				number.getTwo();
			}
		}).start();
		
	}
}
class Number{
	public static synchronized void getOne(){
		try {
			Thread.sleep(3000);
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
		System.out.println("one...");
	}
	public synchronized void getTwo(){
		System.out.println("two...");
	}
	public void getThree(){
		System.out.println("three...");
	}
}

    打印输出结果：

    two
one

  6. 将getOne和getTwo都设置为静态同步方法：

    public class TestSynchronized {
	public static void main(String[] args) throws InterruptedException {
		final Number number = new Number();
		
		//启动一个线程
		new Thread(new Runnable() {
			public void run() {
				number.getOne();
			}
		}).start();
		Thread.sleep(100);
		//启动一个线程
		new Thread(new Runnable() {
			public void run() {
				number.getTwo();
			}
		}).start();
		
	}
}
class Number{
	public static synchronized void getOne(){
		try {
			Thread.sleep(3000);
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
		System.out.println("one...");
	}
	public static synchronized void getTwo(){
		System.out.println("two...");
	}
	public void getThree(){
		System.out.println("three...");
	}
}

    打印输出结果：

    one
two

  7. getOne为静态同步方法，getTwo为普通同步方法，利用两个Number对象分别调用方法：

    public class TestSynchronized {
	public static void main(String[] args) throws InterruptedException {
		final Number number = new Number();
		final Number number2 = new Number();
		
		//启动一个线程
		new Thread(new Runnable() {
			public void run() {
				number.getOne();
			}
		}).start();
		Thread.sleep(100);
		//启动一个线程
		new Thread(new Runnable() {
			public void run() {
				number2.getTwo();
			}
		}).start();
		
	}
}
class Number{
	public static synchronized void getOne(){
		try {
			Thread.sleep(3000);
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
		System.out.println("one...");
	}
	public synchronized void getTwo(){
		System.out.println("two...");
	}
	public void getThree(){
		System.out.println("three...");
	}
}

    打印输出结果:

    two
one

  8. 将getOne和getTwo都设置为静态同步方法，用两个Number对象分别调用方法：

    public class TestSynchronized {
	public static void main(String[] args) throws InterruptedException {
		final Number number = new Number();
		final Number number2 = new Number();
		
		//启动一个线程
		new Thread(new Runnable() {
			public void run() {
				number.getOne();
			}
		}).start();
		Thread.sleep(100);
		//启动一个线程
		new Thread(new Runnable() {
			public void run() {
				number2.getTwo();
			}
		}).start();
		
	}
}
class Number{
	public static synchronized void getOne(){
		try {
			Thread.sleep(3000);
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
		System.out.println("one...");
	}
	public static synchronized void getTwo(){
		System.out.println("two...");
	}
	public void getThree(){
		System.out.println("three...");
	}
}

    打印输出结果：

    one
two
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