BecauseDateis mutable, thescheduleTaskmethod must be careful to defensively copy the date parameter (perhaps throughclone()) into its internal data structure. Otherwise,task1andtask2might both execute tomorrow, which is not what was desired. Worse, the internal data structure used by the task sch...
* * @return true if, and only if, there is at least one element * remaining in this buffer */ public final boolean hasRemaining() { return position < limit; } /** * Tells whether or not this buffer is read-only. * * @return true if, and only if, this buffer is read-only *...
Note also that attempting to access mutable state from behavioral parameters presents you with a bad choice with respect to safety and performance; if you do not synchronize access to that state, you have a data race and therefore your code is broken, but if you do synchronize access to that...
StringBuilder是可变的(Mutable),允许在原始字符串上进行修改,而不是每次修改都生成一个新的字符串。 StringBuilder没有实现线程安全,它的方法没有被synchronized关键字修饰,因此在单线程环境下性能较好。 适用于字符串经常变化的场景,比如在使用循环或者频繁地对字符串进行操作时。
MutableAttributeSet MutableComboBoxModel MutableTreeNode MutationEvent MXBean Name Name Name NameAlreadyBoundException NameCallback NameClassPair NameComponent NameComponentHelper NameComponentHolder NamedNodeMap NamedValue NameDynAnyPair NameDynAnyPairHelper NameDynAnyPairSeqHelper ...
public class Null2Length0MutableDemo { public static void main(String[] args) { List<S...
It is a compile-time error to try to define a protected or private method in an interface. An interface may not define any instance fields. Fields are an implementation detail, and an interface is a specification not an implementation. The only fields allowed in an interface definition are ...
12 WARN security.UserGroupInformation: Exception encountered while running the renewal command for cloudera-scm/admin@LOCAL.DOMAIN. (TGT end time:1572934862000, renewalFailures: org.apache.hadoop.metrics2.lib.MutableGaugeInt@66f06ac9,renewalFailuresTotal: org.apache.hadoop.metrics2.lib.MutableGaugeLong@...
Note: great care must be exercised if mutable objects are used as map keys. The behavior of a map is not specified if the value of an object is changed in a manner that affectsequalscomparisons while the object is a key in the map. A special case of this prohibition is that it is ...
This is interesting because it is implemented using RecursiveAction, the fork/join task that does not yield values on join()method invocations. Instead, tasks share mutable state: the array to be sorted. Again, experiments show a near-linear speedup in the number of cores. Conclusion This ...