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Ans. (i) four: 42 (ii) four: 4
(iii) Hi equals Hi -> true
Hi equals there -> false
Hi equals HI > false
Hi equalsIgnoreCase HI -> true
4. Write the difference between:
a. concat() and “+” operation on string
Ans.
concat() “ + ” operation on string
String function() joining two strings Operator to join two strings
Example Sting st1="India",st2="Kolkata"; Example Sting st1="India”,st2="Kolkata";
System.out.println(st1.concat(st2)); System.out.println(st1+st2);
Ans: IndiaKolkata Ans: IndiaKolkata
b. equals() and equalsIgnoreCase()
Ans.
equals() equalsIgnoreCase()
This function is case-sensitive. This function is non case-sensitive
Example Sting st1="India",st2="INDIA"; Example Sting st1="India",st2="INDIA";
System.out.println(st1.equals(st2)); System.out.println(st1.
Ans: false equalsIgnoreCase(st2));
Ans: true
c. toUpperCase() and toLowerCase()
Ans.
toUpperCase() toLowerCase()
Converts the small letters to capital letters. Converts the capital letters to small letters
Example Sting st1="India"; Example Sting st1="India";
System.out.println(st1.toUpperCase()); System.out.println(st1.toLowerCase());
Ans: INDIA Ans: india
d. == operator and equals() method
Ans. == operator equals()
Checks whether both the characters are equal Checks whether both the strings are equal
or not. or not.
Example: char ch1='A' , ch2='a'; Example: Sting st1= "India", st2="INDIA";
System.out.println(ch1==ch2); System.out.println(st1.equals(st2));
Ans: true Ans: false
5. If String x = "Computer";
String y = "Applications";
What is the output of the following statements?
(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));
Ans. (i) ompu (ii) 4
(iii) Applicationster (iv) False
6. If array[] = {"India","America","England","Sri Lanka", "Bangladesh"};
(i) What is the length of the array? (ii) What is the value of array[2]?
(iii) What is the value of array[2].length()?
Ans. (i) 5 (ii) England
(iii) 7
436436 Touchpad Computer Applications-X

