AI代码解释 publicclassOuterClass{// some large arrays of valuesprivateInnerClass inner;publicvoidcreate(){inner=newInnerClass();// do something with inner and keep it}classInnerClass{// some logic of the inner class}} 假设OuterClass 包含对大量占用大量内存的对象的引用,即使不再使用它也不会被垃...
String createNodeQuery = "CREATE (a:Person {name: '小明'}) RETURN a"; session.run(createNodeQuery); // 创建另一个节点,并建立朋友关系 String createAnotherNodeAndRelationQuery = "CREATE (b:Person {name: '小红'})-[:FRIEND]->(a:Person {name: '小明'}) RETURN b"; session.run(createAn...
代理对象的生成是使用JDK为提供的内置类,也就是Proxy类的newProxyInstance()方法帮助在内存中构建的代理对象,在Cglib代理类中,同样提供了Enhancer工具类,可以使用该类的create()方法帮助构建代理类,值得注意的是,前面说Cglib代理类是通过继承的方式在内存中构建的子类,所以需要setSuperclass()方法指定代理的父类为当前...
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正是由于同步容器类有以上问题,导致这些类成了鸡肋,于是Java5推出了并发容器类,Map对应的有ConcurrentHashMap,List对应的有CopyOnWriteArrayList。与同步容器类相比,它有以下特性: 更加细化的锁机制。同步容器直接把容器对象做为锁,这样就把所有操作串行化,其实这是没必要的,过于悲观,而并发容器采用更细粒度的锁机制,保...
Currently, if these options are specified in JDK 12 or earlier, the runtime attempts to load a SecurityManager implementation with the classname "allow" or "disallow", which results in a Could not create SecurityManager Error and the application will not start up. From this release onward, the...
(URL,USER,PASSWORD);//3. 操作数据库Statement stmt=conn.createStatement();ResultSet resultSet=stmt.executeQuery("SELECT id, name, age, createTime, updateTime FROM user");//4. 如果有数据 resultSet.next() 返回truewhile(resultSet.next()){logger.info("测试结果 姓名:{} 年龄:{}",resultSet....
STRING_VALUES="StringValues";publicstaticfinalStringFEATURE_UNIFORM_LIST_VALUES="UniformListValues";/*...
.toList(); -- 第1条sql数据 SELECT t1.`value1` AS `value1`, t1.`value2` AS `value2`, t1.`value3` AS `value3` FROM (SELECT t.`title` AS `value1`, SUM(t.`star`) AS `value2`, MAX(t.`create_time`) AS `value3` ...
1<insertid="batchSaveCouponCodeList" parameterType="java.util.List" useGeneratedKeys="true" keyProperty="couponId">2INSERTINTO3t_coupon (activity_id, coupon_code, use_status, create_user, create_time)4VALUES5<foreach collection="couponCodeList" item="item"index="index" separator=",">6(#{ite...