2. 下列哪个方法可用于创建一个可运行的类?()
A. public class X implements Runable{ public void run(){ ......} }
B. public class X implements Thread{ public void run(){ ......} }
C. public class X implements Thread{ public int run(){ ......} }
D. public class X implements Thread{ public void run(){ ......} }
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