UppercaseString.java

import java.util.*;

public class JavaStrings{

    public static String toUpperCase(String str) {
        StringBuilder sb = new StringBuilder("");

        char ch = Character.toUpperCase(str.charAt(0));
        sb.append(ch);

        for(int i=1; i<str.length(); i++){
            if(str.charAt(i) == ' ' && i<str.length()-1){
                sb.append(str.charAt(i));
                i++;
                sb.append(Character.toUpperCase(str.charAt(i)));
            } else{
                sb.append(str.charAt(i));

            }
        }
        return sb.toString();
    }
    public static void main(String args[]){
        String str = "hi, i am simran";
        System.out.println(toUpperCase(str));
    }
}