JavaStrings

StringDeclaration of StringString s1;

Declare and Initialize a String String s2 = “SIKANDER”;

Length of StringString name = “SIKANDER”;int len = name.length( );

Output : 8

Accessing Individual Elements of StringcharAt(int index);

String Assignment

String Concatenation+

Compare StringString s1 = "ABCD”;String s2 = "ABCD”;if(s1 == s2)

System.out.println("Equal");else

System.out.println("NOT Equal");

In Java, when the“==” operator is used to compare2 objects, it checks to see if the objects refer to the same place in memory.

String s1 = new String("ABCD”);String s2 = new String("ABCD”); if(s1 == s2)

System.out.println("Equal");else

System.out.println("NOT Equal");

To check if strings have same data, use equals

String s1 = new String("ABCD");String s2 = new String("ABCD"); if(s1.equals(s2)) System.out.println("Equal");else System.out.println("NOT Equal");

String Concatination

System.out.println(3 + 5); System.out.println(3 + 5 +

"abcd"); System.out.println("abcd" + 3 +

5); System.out.println("abcd" + 3 *

5);

What is the output of these statements?

String str = "SIKANDER”; System.out.println(str); System.out.println(str.toLowerCase());

String str = "SIKANDER”;

System.out.println(str);str.toLowerCase();System.out.println(str);

String str = "SIKANDER”;System.out.println(str.hashCode());str = str.toLowerCase();System.out.println(str.hashCode());

https://www.hackerrank.com/challenges/camelcase

https://www.hackerrank.com/challenges/pangrams

Count Number of Unique Charactershttps://www.hackerrank.com/challenges/string-construction