Question

为java.lang.Comparable编写的泛型声明，你看对吗？小白求指教。。

package java.lang;

public
interface Comparable {

public int
compareTo(Object o)

}

Answer 1

<T>类型中，这样写是泛型

package example;

public interface Comparable<T>{

public int compareTo(T o);

}

Answer 2

package java.lang;
public interface Comparable<E>{
public int compareTo(E o);
}