weixin_44533042的博客

在网上看到一个能挺方便的看源码翻译的插件Translation使用效果如下：

HashMap源码Hash table based implementation of the Map interface. This implementation provides all of the optional map operations, and permits null values and the null key. (The HashMap class is roughly equivalent to Hashtable, except that it is unsynchroniz

//截取文件后缀String s = "frank.mp3"; int lastIndexOf = s.lastIndexOf("."); String suffix = s.substring(lastIndexOf + 1); System.out.println(suffix);

重写toString和equals方法section 1 重写toString方法源码：/** * Returns a string representation of the object. In general, the * {@code toString} method returns a string that * "textually represents" this object. The result should * be a concise b