Java Programming Quiz

What will be the output? java int a = 10; System.out.println(a++ + ++a);

• 21

• 22

• 20

• 23

Which of the following is not a valid Java keyword?

• static

• Integer

• this

• final

What is the output? java int x = 5; int y = ++x * 2 + x--; System.out.println(y);

• 13

• 18

• 16

• 12

What is the result of the following? java String s1 = "Java"; String s2 = new String("Java"); System.out.println(s1 == s2);

• true

• false

• error

• null

Which concept allows you to use the same method name with different parameters?

• Inheritance

• Polymorphism

• Encapsulation

• Abstraction

What will be printed? java String str = "abc"; str.concat("d"); System.out.print(str);

• abcd

• abc

• Error

• null

What will the output be? java int[] a = {1, 2, 3}; System.out.println(a.length);

• 3

• 2

• 4

• Error

What is inheritance in Java?

• Creating multiple methods with the same name

• Acquiring properties from one class to another

• Hiding data members

• Overriding a constructor

What is the output? java int i = 1; while (i 7) ? 10 : 20; System.out.println(y);

• 10

• 20

• 7

• Error

What is the output? java int[] arr = new int[3]; System.out.println(arr[0]);

• 0

• null

• Garbage value

• Error