What happens if an abstract class does not have any abstract methods?
4 - 0
Which of the following collections allows duplicate elements?
5 - 0
What is the difference between List<Object> and List<?>?
4 - 0
What is the main purpose of a Singleton class in Java?
6 - 0
What will be the output of the following code?
public class Test {
public static void main(String[] args) {
String s1 = "Java";
String s2 = new String("Java");
String s3 = s2.intern();
System.out.println(s1 == s2);
System.out.println(s1 == s3);
System.out.println(s2.equals(s3));
}
}
4 - 0
The ArrayList class is part of the java.util package.
3 - 0
Which package is automatically imported into every Java program?
7 - 0
7. Which of the following classes is immutable?
6 - 1
What will be the result of the expression: 5 + 2 + "Java"?
4 - 0
Which keyword is used to inherit a class in Java?
6 - 1
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25 September 2020