请简述synchronized和J.ava.util.concurrent.locks.Lock的异同点
请简述synchronized和J.ava.util.concurrent.locks.Lock的异同点
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synchronized和java.util.concurrent.locks.Lock的比较,描述正确的是() A.Lock不能完成synchronized所实现的所有功能B.synchronized会自动释放锁C.Lock一定要求程序员手工释放,并且必须在finally从句中释放D.Lock有比synchronized更精确的线程语义和更好的性能
LTE中『____』基于主同步信号和辅同步信号进行的。(What carries on basing on the main synchronized signal and the auxiliary synchronized signal in LTE system『____』.)
用于LTE小区搜索的同步信号是『____』信号和『____』信号。(The synchronized signal for cell search in LTE is『____』signal. )
在以下哪种情况下,对象不会解锁?( )A.synchronized段语句块执行完毕B.synchronized语句块中出现exceptionC.持锁线程调用对象wait () 方法D.synchronized语句块中调用suspend () 方法
Whichthreewillcompileandrunwithoutexception?() A.privatesynchronizedObjecto;B.voidgo(){synchronized(){/*codehere*/}C.publicsynchronizedvoidgo(){/*codehere*/}D.privatesynchronized(this)voidgo(){/*codehere*/}E.voidgo(){synchronized(Object.class){/*codehere*/}F.voidgo(){Objecto=newObject();synchronized(o){/*codehere*/}
classAccount{privateintbalance;publicvoidsetBalance(intb){balance=b;}publicintgetBalance(){returnbalance;}publicvoidclearBalance(){balance=0;}}哪一个改变可以使Account类线程安全?() A.在第2行加synchronized修饰符。B.在第3行加synchronized修饰符。C.在第3行、第4行和第6行加synchronized修饰符。D.在第4行、第6行和第8行加synchronized修饰符。
Given:Which two changes, taken together, would guarantee the output: 1, 2, 3, 4, 5, ?() A.move the line 12 print statement into the foo() methodB.change line 7 to public synchronized void go() {C.change the variable declaration on line 2 to private volatile int x;D.wrap the code inside the foo() method with a synchronized( this ) blockE.wrap the for loop code inside the go() method with a synchronized block synchronized(this){ //for loop code here }
阅读下面实现堆栈类并发控制的部分代码 public class DataStack{ private int idx=0; private int[]data=new int[8]; public void push(int i){ . ________________{ data[idx]=i; idx + +; } } } …… } 在程序下画线处填入正确选项是A.synchronizedB.synchronized(this)C.synchronized()D.synchronized(idx)
下列各项说法中错误的是( )。A.共享数据的所有访问都必须使用synchronized加锁B.共享数据的访问不一定全部使用synchronized加锁C.所有的对共享数据的访问都是临界区D.临界区必须使用synchronized加锁
在多线程并发程序设计中,能够给对象x加锁的语句是( )。 A.X.waitB.synchronized(x)S 在多线程并发程序设计中,能够给对象x加锁的语句是( )。A.X.waitB.synchronized(x)C.X.notifyD.x.synchronized
( 31 ) 为了支持压栈线程与弹栈线程之间的交互与同步 , 在程序的下划线处依次填入的语句是public class IntStack{private int idx=0;private int[] data=new int[8];public void push(int i){data[idx]=i;idx++;}__________......}A ) synchronized()notify()B ) synchronized()this.wait()C ) synchronized()this.notify()D ) synchronized()sleep()
synchronized和java.util.concurrent.locks.Lock的比较,描述正确的是() A、Lock不能完成synchronized所实现的所有功能B、synchronized会自动释放锁C、Lock一定要求程序员手工释放,并且必须在finally从句中释放D、Lock有比synchronized更精确的线程语义和更好的性能
class Account { private int balance; public void setBalance(int b) { balance = b; } public int getBalance() { return balance; } public void clearBalance() { balance = 0; } } 哪一个改变可以使 Account 类线程安全?() A、在第2行加 synchronized 修饰符。B、在第3行加 synchronized 修饰符。C、在第3行、第4行和第6行加 synchronized 修饰符。D、在第4行、第6行和第8行加 synchronized 修饰符。
Which three will compile and run without exception?()A、private synchronized Object o;B、void go() {synchronized() { /* code here */ }C、public synchronized void go() { /* code here */ }D、private synchronized(this) void go() { /* code here */ }E、void go() {synchronized(Object.class) { /* code here */ }F、void go() {Object o = new Object();synchronized(o) { /* code here */ }
多选题Which three changes should be made to adapt this class to be used safely by multiple threads?()Adeclare reset() using the synchronized keywordBdeclare getName() using the synchronized keywordCdeclare getCount() using the synchronized keywordDdeclare the constructor using the synchronized keywordEdeclare increment() using the synchronized keyword
多选题public class NamedCounter { private final String name; private int count; public NamedCounter(String name) { this.name = name; } public String getName() { return name; } public void increment() { coount++; } public int getCount() { return count; } public void reset() { count = 0; } } Which three changes should be made to adapt this class to be used safely by multiple threads? ()Adeclare reset() using the synchronized keywordBdeclare getName() using the synchronized keywordCdeclare getCount() using the synchronized keywordDdeclare the constructor using the synchronized keywordEdeclare increment() using the synchronized keyword
多选题synchronized和java.util.concurrent.locks.Lock的比较,描述正确的是()ALock不能完成synchronized所实现的所有功能Bsynchronized会自动释放锁CLock一定要求程序员手工释放,并且必须在finally从句中释放DLock有比synchronized更精确的线程语义和更好的性能
单选题class Account { private int balance; public void setBalance(int b) { balance = b; } public int getBalance() { return balance; } public void clearBalance() { balance = 0; } } 哪一个改变可以使 Account 类线程安全?()A在第2行加 synchronized 修饰符。B在第3行加 synchronized 修饰符。C在第3行、第4行和第6行加 synchronized 修饰符。D在第4行、第6行和第8行加 synchronized 修饰符。
多选题Which three will compile and run without exception?()Aprivate synchronized Object o;Bvoid go(){ synchronized(){/* code here */}Cpublic synchronized void go(){/* code here */}Dprivate synchronized(this) void go(){/* code here */}Evoid go(){ synchronized(Object.class){/* code here */}Fvoid go(){ Object o = new Object(); synchronized(o){/* code here */}
单选题以下哪个方法可以用来获得进度条的当前进度值?()Apublic synchronized int getProgress()Bpublic synchronized void setIndeterminate (boolean indeterminate)Cpublic synchronized void setProgress(int progress)DPublic final synchronized void incrementProgressBy(int diff)