The declared package “java.lang” doesn't match the expected package “”

Question

我正在尝试在Eclipse中使用Comparable Interface，但是仍然出现上述错误，我无法导入package java.lang;

Answer 1

It's either :

import java.lang.*;

Or

import java.lang.Comparable;

but not :

import java.lang;

Because it's a syntax error in Java.