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Function Overloading - String Based Program - Java Programs

Design a class to overload a function joyString() as follows:
(i) void joyString(String s, char ch1, char ch2) with one string argument and two character arguments that replaces the character argument ch1 with the character argument ch2 in the given string s and prints the new string.
Example:
INPUT:
s = “TECHNALAGY”
ch1 = ‘A’
ch2 = ‘O’
OUTPUT:
“TECHNOLOGY”

(ii) void joyString(String s) with one string argument that prints the position of the first space and the last space of the given string s.
Example:
INPUT:
s = “Cloud computing means Internet-based computing”
OUTPUT:
First index: 5
Last index: 36
(iii) void joyString(String s1, String s2) with two string arguments that combines the two strings with a space between them and prints the resultant string.
Example:
INPUT:
s1 = “COMMON WEALTH”
s2 = “GAMES”
OUTPUT:
COMMON WEALTH GAMES
(use library functions)

Java 

class Overload{
    public static void joyString(String s, char ch1, char ch2){
        s = s.replace(ch1, ch2);
        System.out.println(s);
    }
    public static void joyString(String s){
        int first = s.indexOf(' ');
        int last = s.lastIndexOf(' ');
        System.out.println("First index: " + first);
        System.out.println("Last index: " + last);
    }
    public static void joyString(String s1, String s2){
        String s3 = s1 + " " + s2;
        System.out.println(s3);
    }
}

Output
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