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Q1. Which two demonstrate the valid usage of the keyword synchronized? A. interface ThreadSafe { synchronized void doIt(); } B. abstract class ThreadSafe { synchronized abstract void doIt(); } C. class ThreadSafe { synchronized static void soIt () {} } D. enum ThreadSafe { ONE, TWO, Three; synchronized final void doIt () {} } View AnswerAnswer: C Explanation: The Java programming
Q1. Which statement declares a generic class? A. public class Example < T > { } B. public class <Example> { } C. public class Example <> { } D. public class Example (Generic) { } E. public class Example (G) { } F. public class Example { } View AnswerAnswer: A Explanation: Example: public class Pocket<T> { private T value; public Pocket() {} public Pocket( T
Q1. Given: import java.util.concurrent.atomic.AtomicInteger; public class AtomicCounter { private AtomicInteger c = new AtomicInteger(0); public void increment() { // insert code here } } Which line of code, inserted inside the increment () method, will increment the value of c? A. c.addAndGet(); B. c++; C. c = c+1; D. c.getAndIncrement (); View AnswerAnswer: D Explanation: getAndI
Q1. When using the default file system provider with a JVM running on a DOS-based file system, which statementis true? A. DOS file attributes can be read as a set in a single method call. B. DOS file attributes can be changed as a set in a single method call. C. DOS file attributes can be modified for symbolic links and regular files. D. DOS file attributes can be modified in the same method
Q1. Given the existing destination file, a source file only 1000 bytes long, and the code fragment: What is the result? A. Overrides the content of the destination file with the source file content B. Appends the content of the source file to the destination file after a new line C. Appends the content of the source file to the destination file without a break in the flow D. Throws a runtime
Q1. Given the integer implements comparable: What is the result? A. 4 1 B. 1 2 C. 32 D. 21 E. 2 3 View AnswerAnswer: D Explanation: binarySearch public static <T> int binarySearch(List<? extends Comparable<? super T>> list, T key) Searches the specified list for the specified object using the binary search algorithm. The list must be sorted into ascending order acco
Q1. Which is a key aspect of composition? A. Using inheritance B. Method delegation C. Creating abstract classes D. Implementing the composite interface View AnswerAnswer: B Explanation: In the composition approach, the subclass becomes the "front-end class," and the superclass becomes the"back-end class." With inheritance, a subclass automatically inherits an implemenation of any non-pri
Q1. Given the interface: Public interface Idgenerator { int getNextId(); } Which class implements IdGenerator in a thread-safe manner, so that no threads can get a duplicate id valuecurrent access? A. Public class generator Implements IdGenerator { Private AtomicInteger id = new AtomicInteger (0); return id.incrementAndget(); }} B. Public class Generator Implements idGenerator { private
Q1. How many Threads are created when passing task to an Executor instance? A. A new Thread is used for each task. B. A number of Threads equal to the number of CPUs Is used to execute tasks. C. A single Thread Is used to execute all tasks. D. A developer-defined number of Threads is used to execute tasks. E. A number of Threads determined by system load is used to execute tasks. F. The met