学Java的小伙伴肯定经常听到“核心包”这个词，但具体是啥玩意儿？其实就像你搬家要用的工具箱，Java核心包就是程序员写代码的“基础工具箱”。今天咱们就用大白话聊聊这些核心包，保证不扯官方术语！ 一、java.lang包——你的代码“氧气瓶” 这包不用手动 ...

Using generics results in more robust code and avoids ClassCastExceptions in your Java programs. This in-depth tutorial introduces you to generics and their types and methods. Generics are used in ...

前段时间，同事在代码中KW扫描的时候出现这样一条： 上面出现这样的原因是在使用foreach对HashMap进行遍历时，同时进行put ...

at java.base/java.util.ArrayList.forEach(ArrayList.java:1541) at java.base/java.util.Collections$UnmodifiableCollection.forEach(Collections.java:1085) at org.sonar ...

Looks like it was a bad idea to keep ExecuteTaskBuildOperationType.Result since we don't have control on this structure and the size of it. This might contribute to the high memory pressure. I suggest ...

在《疫苗：Java HashMap的死循环》中，我们看到，java.util.HashMap并不能直接应用于多线程环境。对于多线程环境中应用HashMap，主要有以下几种选择： 使用线程安全的java.util.Hashtable作为替代。 使用java.util.Collections.synchronizedMap方法，将已有的HashMap对象包装为线程安全的 ...

Google Guava has much to offer the Java developer working with J2SE 5, Java SE 6, or Java SE 7. The older the version of these being used, the more useful Guava can be. Although Java SE 7 brings ...