Given:What is required to make the Foo class thread safe? A. No change is required. B. Make the declaration of lock static. C. Replace the lock constructor call with new ReentrantLock (true). D. Move the declaration of lock inside the foo method. Correct Answer: C Reference:/how-to-make-java-class-thread-safe
Given:What is the correct definition of the JsonField annotation that makes the Point class compile?A)B)C) A. Option C B. Option A C. Option B Correct Answer: B
Given:What is the expected result of javac? A. javac fails to compile the class and prints the error message, Error: Could not find or load main class Mycar.class B. javac fails to compile the class and prints the error message, C:\workspace4\Mycar.java:1:error: package java does not exist C. javac compiles Mycar.java without errors or warnings. D. javac fails to… Read More »
Given:What is the output? A. Hello world!Bonjour le monde! B. Hello world!Hello world! C. Bonjour le monde!Hello world! D. Bonjour le monde!Bonjour le monde! Correct Answer: C
Given:What is the output? A. null B. A NoSuchElementException is thrown at run time. C. Duke D. A NullPointerException is thrown at run time. Correct Answer: C
Given:What is the output? A. 300 B. Exception C. 200 D. 100 Correct Answer: A
Given:What is the output?banana orange apple lemon A. —–apple banana lemon orange—–—– B. banana orange apple lemon—–apple banana lemon orange—– C. —–—– D. —–banana orange apple lemon apple banana lemon orangebanana orange apple lemon apple banana lemon orange E. —–—– Correct Answer: D
Given:What is the result? A. 9 B. An exception is thrown at runtime. C. 3 D. 6 Correct Answer: D
Given:What is the result? A. watermelonorangelemongrapeapricotapple B. nothing C. appleapricotgrapelemonorangewatermelon D. appleorangegrapelemonapricotwatermelon Correct Answer: A
Given:What is the result? A. Keys: 0 Values: 0 Map: B. The compilation fails. C. Keys: 4 Values: 4 Map: 4 D. Keys: 0 Values: 0 Map: 0 E. Keys: 4 Values: 4 Map: 0 Correct Answer: C