线程锁的常见几种情况

线程锁的几种情况

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

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

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

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

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

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

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

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

线程锁的常见几种情况

线程锁的几种情况

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