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This is a simple Java program shows you the basic String operations that you can perform on Strings

public class BasicStringOperations {

    public static void main(String[] args) {

        String firstname = "firstName";
        String lastname = "lastName";

        // add two Strings
        System.out.println(firstname + " " + lastname);

        // Changing the case
        System.out.println(firstname.toUpperCase() + " " + lastname.toUpperCase());

        // Changing the case
        System.out.println(firstname.toLowerCase() + " " + lastname.toLowerCase());

        // adding two strings with another String in middle
        System.out.println(firstname + ", " + " " + lastname);

        // Searching the index of a character - Positive case 
        System.out.println(firstname.indexOf("i"));

        // Searching the index of a character - Negative case
        System.out.println(firstname.indexOf("q"));

        // Checking whether or not the String has given character in it
        System.out.println(firstname.contains("q"));

        // Getting the character at 4th position
        System.out.println(firstname.charAt(4));
    }
}

Output

firstName lastName
FIRSTNAME LASTNAME
firstname lastname
firstName,  lastName
1
-1
false
t



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