java静态方法中的变量是否共享内存块

由结果来看应该是不共享内存块,也就是说同一静态方法的不同调用,方法内部的变量都是不同的,我真傻.

public class Test {

	/**
	 * @param args
	 */
	public static void A(String mark)
	{
		int i=0;
		for(;i<20;i++){
			try{
				Thread.sleep(1000);
				System.out.println("looping in "+mark+",value:"+i);
			}
			catch(Exception e)
			{
				System.out.println("ff");
			}
		}
			
	}
	


}

public class TestThread implements Runnable {
	public String mark;
	
	public void run() {
		// TODO Auto-generated method stub
		Test.A(mark);
	}
	
	public static void main(String args[]) throws Exception
	{
		TestThread ta = new TestThread();
		ta.mark="A";
		TestThread tb = new TestThread();
		tb.mark="B";
		Thread t1 = new Thread(ta);
		Thread t2 = new Thread(tb);
		t1.start();
		Thread.sleep(2000);
		t2.start();
	}

}