Write a program that accept two string one for main string and second string will store some word and remove this word form main string?

Question : Write a program that accept two string one for main string and second string will store some word and remove this word form main string?

Input : ram is a good boy

Search string : ram good

Output : is a boy

Solution : 

import java.util.*;

public class Main

{

  

    public static void main(String[] args)

    {

        int i,start=0,j,flag;

        String str1,str2,str3,str4="";

        char ch;

        Scanner sc=new Scanner(System.in);

        System.out.print("Enter your string>> ");

        str1=sc.nextLine();

        str4=str1;

        System.out.print("Enter your Search String>> ");

        str2=sc.nextLine();

        for(i=0;i<str2.length();i++)

        {

            if(str2.charAt(i)==' ')

            {

                str3=str2.substring(start,i);

                str1=str1.replaceAll(str3,"");

                start=i;

            }

        }

        //Getting last word from search string

        str3=str2.substring(start,str2.length());

        str1=str1.replaceAll(str3,"");

        System.out.println("Original string is >> "+str4);

        System.out.println("After remove words string is >> "+str1);

    }

}

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