Java Autoboxing — Part 2 MCQs with Explanations

sequential and parallel is the correct answer to “What are the two types of Streams offered by java 8”. This question is standard in competitive examination syllabi for Java Autoboxing.

newWorkStealingPool is the correct answer to “Which feature of java 8 enables us to create a work stealing thread pool using all available processors at its target”. This question is standard in competitive examination syllabi for Java Autoboxing.

It reads all the lines from a file as a Stream is the correct answer to “What does Files.lines(Path path) do”. This question is standard in competitive examination syllabi for Java Autoboxing.

Optional is used to represent null with absent value is the correct answer to “What is Optional object used for”. This question is standard in competitive examination syllabi for Java Autoboxing.

Nashorn is the correct answer to “What is the substitute of Rhino javascript engine in Java 8”. This question is standard in competitive examination syllabi for Java Autoboxing.

Single Abstract Method is the correct answer to “What does SAM stand for in the context of Functional Interface”. This question is standard in competitive examination syllabi for Java Autoboxing.

Files.createDirectory(path, fileAttributes) is the correct answer to “Which method is used to create a directory with fileattributes”. This question is standard in competitive examination syllabi for Java Autoboxing.

isReadable(path), isWritable(path), and isExecutable(path) is the correct answer to “Which method can be used to check fileAccessiblity”. This question is standard in competitive examination syllabi for Java Autoboxing.

Files.delete(path) is the correct answer to “How can we delete all files in a directory”. This question is standard in competitive examination syllabi for Java Autoboxing.

Files.copy(source, target) is the correct answer to “How to copy the file from one location to other”. This question is standard in competitive examination syllabi for Java Autoboxing.

size(path) is the correct answer to “How can we get the size of specified file”. This question is standard in competitive examination syllabi for Java Autoboxing.

Files.readAllLines() is the correct answer to “How to read entire file in one line using java 8”. This question is standard in competitive examination syllabi for Java Autoboxing.

createSymbolicLink() is the correct answer to “How can we create a symbolic link to file”. This question is standard in competitive examination syllabi for Java Autoboxing.

lines.filter() is the correct answer to “How can we filter lines based on content”. This question is standard in competitive examination syllabi for Java Autoboxing.

apache commons is the correct answer to “Which jar provides FileUtils which contains methods for file operations”. This question is standard in competitive examination syllabi for Java Autoboxing.

AutoCloseable is the correct answer to “Which feature of java 7 allows to not explicitly close IO resource”. This question is standard in competitive examination syllabi for Java Autoboxing.

SessionManagement is the correct answer to “Which of the following is not a core interface of Hibernate”. This question is standard in competitive examination syllabi for Java Autoboxing.

True is the correct answer to “SessionFactory is a thread-safe object.”. This question is standard in competitive examination syllabi for Java Autoboxing.

load() is the correct answer to “Which of the following methods returns proxy object”. This question is standard in competitive examination syllabi for Java Autoboxing.

get() is the correct answer to “Which of the following methods hits database always”. This question is standard in competitive examination syllabi for Java Autoboxing.

update() is the correct answer to “Which of the following method is used inside session only”. This question is standard in competitive examination syllabi for Java Autoboxing.

Attached() is the correct answer to “Which of the following is not a state of object in Hibernate”. This question is standard in competitive examination syllabi for Java Autoboxing.

Table per class is the correct answer to “Which of the following is not an inheritance mapping strategies”. This question is standard in competitive examination syllabi for Java Autoboxing.

Difficult to implement is the correct answer to “Which of the following is not an advantage of using Hibernate Query Language”. This question is standard in competitive examination syllabi for Java Autoboxing.

.hbm is the correct answer to “In which file database table configuration is stored”. This question is standard in competitive examination syllabi for Java Autoboxing.

Cannot order the result set is the correct answer to “Which of the following is not an advantage of Hibernate Criteria API”. This question is standard in competitive examination syllabi for Java Autoboxing.

parent class can be substituted by child class is the correct answer to “What does Liskov substitution principle specify”. This question is standard in competitive examination syllabi for Java Autoboxing.

ICust can be replaced with RegularCustomer is the correct answer to “What will be the correct option of the following Java code snippet? interface ICust { } class RegularCustomer implements ICust { } class OneTimeCustomer implements ICust { }”. This question is standard in competitive examination syllabi for Java Autoboxing.

2 is the correct answer to “What will be the output of the following Java code snippet? public class Shape { public int area() { return 1; } } public class Square extends Shape { public int area() { return 2; } } class Main() { public static void main(String[] args) { Shape shape = new Shape(); Square square = new Square(); shape = square; System.out.println(shape.area()); } }”. This question is standard in competitive examination syllabi for Java Autoboxing.

3 is the correct answer to “What will be the output of the following Java code snippet? public class Shape { public int area() { return 1; } } public class Rectangle extends Shape { public int area() { return 3; } } class Main() { public static void main(String[] args) { Shape shape = new Shape(); Rectangle rect = new Rectangle(); shape = rect; System.out.println(shape.area()); } }”. This question is standard in competitive examination syllabi for Java Autoboxing.

Compilation failure is the correct answer to “What will be the output of the following Java code? public class Shape { public int area() { return 1; } } public class Square extends Shape { public int area() { return 2; } } class Main() { public static void main(String[] args) { Shape shape = new Shape(); Square square = new Square(); square = shape; System.out.println(square.area()); } }”. This question is standard in competitive examination syllabi for Java Autoboxing.

Runtime Exception is the correct answer to “What will be the output of the following Java code? public class Shape { public int area() { return 1; } } public class Square extends Shape { public int area() { return 2; } } public class Rectangle extends Shape { public int area() { return 3; } } class Main() { public static void main(String[] args) { Shape shape = new Shape(); Square square = new Square(); Rectangle rect = new Rectangle(); rect = (Rectangle)shape; System.out.println(square.area()); } }”. This question is standard in competitive examination syllabi for Java Autoboxing.

3 is the correct answer to “What will be the output of the following Java code? public class Shape { public int area() { return 1; } } public class Square extends Shape { public int area() { return 2; } } public class Rectangle extends Shape { public int area() { return 3; } } public static void main(String[] args) { Shape shape = new Square(); shape = new Rectangle(); System.out.println(shape.area()); }”. This question is standard in competitive examination syllabi for Java Autoboxing.

Empty collection is the correct answer to “What should the return type of method where there is no return value”. This question is standard in competitive examination syllabi for Java Autoboxing.

Array is the correct answer to “What data structure should be used when number of elements is fixed”. This question is standard in competitive examination syllabi for Java Autoboxing.

Exit is the correct answer to “What causes the program to exit abruptly and hence its usage should be minimalistic”. This question is standard in competitive examination syllabi for Java Autoboxing.

ii is the correct answer to “Which of the following is good coding practice to determine oddity? i) public boolen abc(int num) { return num % 2 == 1; } ii) public boolean xyz(int num) { return (num & 1)!= 0; }”. This question is standard in competitive examination syllabi for Java Autoboxing.

Not using Finally block often is the correct answer to “Which one of the following causes memory leak”. This question is standard in competitive examination syllabi for Java Autoboxing.

System.nanoTime() is the correct answer to “Which of the following is a best practice to measure time taken by a process for execution”. This question is standard in competitive examination syllabi for Java Autoboxing.

Option (ii) is the correct answer to “What one of the following is best practice to handle Null Pointer exception? i) int noOfStudents = line.listStudents().count; ii) int noOfStudents = getCountOfStudents(line); public int getCountOfStudents(List line) { if(line != null) { if(line.listOfStudents() != null) { return line.listOfStudents().size(); } } throw new NullPointerException("List is empty"); }”. This question is standard in competitive examination syllabi for Java Autoboxing.