If:

String x = "Computer";  
String y = "Applications";

What do the following functions return?

(i) System.out.println(x.substring(1,5));

(ii) System.out.println(x.indexOf(x.charAt(4)));

(iii) System.out.println(y + x.substring(5));

(iv) System.out.println(x.equals(y));

(i) System.out.println(x.substring(1,5));

Output

ompu

Explanation

x.substring(1,5) will return a substring of x starting at index 1 till index 4 (i.e. 5 - 1 = 4).

(ii) System.out.println(x.indexOf(x.charAt(4)));

Output

4

Explanation

charAt() method returns the character at a given index in a String. Thus, x.charAt(4) will return the character at the 4th index i.e., u. indexOf() method returns the index of the first occurrence of a given character in a string. Thus, it returns the index of u, which is 4.

(iii) System.out.println(y + x.substring(5));

Output

Applicationster

Explanation

x.substring(5) will return the substring of x starting at index 5 till the end of the string. It is "ter". This is added to the end of string y and printed to the console as output.

(iv) System.out.println(x.equals(y));

Output

false

Explanation

equals() method checks for value equality, i.e., whether both objects have the same value regardless of their memory location. As the values of both x and y are different so it returns false.