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druid1.2.6+ojdbc19.14.0.0循环执行同一条sql报java.sql.SQLEx

测试用例： `@Test public void testQuery() throws SQLException, InterruptedException { DruidDataSource ds = new DruidDataSource(); ds.setDriverClassName("or...

数组模拟环形（循环）队列（Java语言实现）

数组模拟环形（循环）队列（Java语言实现）紧接着上一个内容，使用循环队列可以让数组模拟的单向队列复用，这样提高了程序的效率。循环队列：代码实现循环队列类：RepeatQueue.javapackage cn.Day02.demo2; public class RepeatQueu...

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【Groovy】循环控制 ( Java 语法循环 | 默认的 IntRange 构造函数 | 可设置翻转属性的 IntRange 构造函数 | 可设置是否包含 to 的构造函数 | 0..9 简写 )（一）

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【Groovy】循环控制 ( Java 语法循环 | 默认的 IntRange 构造函数 | 可设置翻转属性的 IntRange 构造函数 | 可设置是否包含 to 的构造函数 | 0..9 简写 )（二·）

四、完整代码示例完整代码示例 :class Test { static void main(args) { // Java 语法样式的循环 println "" print "( 0 ) : " for (int j = 0; j <= 9; j++) {...

请问在循环中调用java ConcurrentMap的 putIfAbsent方法是否会有性能问题？

在循环中调用java ConcurrentMap的 putIfAbsent方法是否会有性能问题？

关于循环体内的多线程问题#JAVA-多线程-同步

一般来讲，线程放在一个循环体内部（比如for循环)，如果之后还有一个放在循环体中的线程，根据规定，应该是等待上一个循环体中的所有线程都进入就绪状态后下一个循环体中的代码才会被执行，也就是说实际上没能真正实现线程同步。根据自己的实验也确实如此。那么为什么还要把线程放进循环体中呢，这样不是不能实现多线程...

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