if-else-if statement is used when we need to check multiple conditions. In this statement we have only one “if” and one “else”, however we can have multiple “else if”. It is also known asif else if ladder.
After either condition is met (new release becoming available or expiration date reached), the JRE will provide additional warnings and reminders to users to update to the newer version. For more information, see 23.1.2 JRE Expiration Date in the Java Platform, Standard Edition Deployment Guide....
await() signal() signalAll() java.util.concurrent 类库中提供了 Condition 类来实现线程之间的协调,可以在 Condition 上调用 await() 方法使线程等待,其它线程调用 signal() 或 signalAll() 方法唤醒等待的线程。相比于 wait() 这种等待方式,await() 可以指定等待的条件,因此更加灵活。 2 并发关键字 关键字:...
Control Statements Control statements generally direct the flow of programs based on any desired condition. Control mechanisms such asif, else, switch, and loops like for, while, and do-whileare available in Java. These features will enable the implementer to perform the execution of blocks dependi...
This is true even if it can be shown that the interrupt occurred after another action that may have unblocked the thread. An implementation should document this behavior. Added in 1.5. Java documentation for java.util.concurrent.locks.Condition. Portions of this page are modifications based...
Waiting(等待),当线程等待另一个线程通知调度器一个条件时,它自己进入等待状态。在调用Object.wait方法或Thread.join方法,或者是等待java.util.concurrent库中的Lock或Condition时,就会出现这种情况; Timed waiting(计时等待),Object.wait、Thread.join、Lock.tryLock和Condition.await等方法有超时参数,还有Thread.sleep方...
if (condition-x) commit transaction else if (condition-y) update table-b commit transaction else rollback transaction begin transaction update table-c commit transactionWhen coding an application-managed transaction for session or message-driven beans, you must decide whether to use Java Database ...
suppliednanosTimeoutvalue upon return, or a value less than or equal to zero if it timed out. This value can be used to determine whether and how long to re-wait in cases where the wait returns but an awaited condition still does not hold. Typical uses of this method take the ...
以及条件信息(condition-code information)。连同程序计数器,在中断发生时必须要保存这些状态信息,这样便于后来进程继续正确执行(图4.3)。 CPU 调度信息:包括进程优先权、指向调度队列的指针和其它的调度参数。(第六章描述进程调度。) 存储器管理信息:可能包括诸如基址寄存器和界限寄存器值、页表或段表,这取决于操作系统...
The Java platform supports multithreading at the language level with the addition of sophisticated synchronization primitives: the language library provides theThreadclass, and the run-time system provides monitor and condition lock primitives. At the library level, moreover, Java technology's high-level...