package com.wangc.collections;

public class MyMap {
}

package com.wangc.collections;
// https://zhuanlan.zhihu.com/p/28525770   http://blog.csdn.net/maoyeqiu/article/details/49363661  http://www.aizhuanji.com/a/Lx31EQ8V.html
public class MyMap {
}

Update MyMap.java