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HashMap源码分析 HashMap的数据结构 1.数组: 2.链表:双向链表 3.红黑树:二叉查找数 源码中验证: /** * Holds cached entrySet(). Note that AbstractMap fields are used * for keySet() and va 阅读全文
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按照in语句中内容进行返回 这里使用了Oracle中的函数DECODE,对应的数据库语句 DECODE函数的介绍 select * from tbl where id in('A7519254DEA575ECE053EB68580A1371','A7519254DEA875ECE053EB68580 阅读全文
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今天我们村花孙大俊,考了我一道面试小题: public static void main(String[] args) { int a = Integer.MAX_VALUE -100; int b = Integer.MAX_VALUE; int count = 0; for (int i = a 阅读全文
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解决java项目出现:java.exe’ 'finished with non-zero exit value 1问题 具体问题详情: Execution failed for task ':T01_Teet.main()'. >Process 'command 'xxx/java.exe'' fi 阅读全文
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ubantu出现异常: The system is running in low-graphics mode Your screen,graphics card,and input device settings could not be detected correctly.You will ne 阅读全文