[FIXED] Compare two strings and replace matches

Issue

Im very new to Java and I have a following task:

Compare string 1 to string 2 letter by letter and find those that match and replace them with *.

I am completely lost and need some assistance. Here is a bit of code I was able to put together myself.

Scanner sc = new Scanner(System.in);
String str1 =  sc.nextLine();
String str2 =  sc.nextLine();
        
char char1 = str1.charAt(0);
char char2 = str2.charAt(0);
        
for(int i=0; i<str1.length();i++){
   if(str2.equals(str1)){
                
   }
}

Solution

Try this.

public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    StringBuilder str1 = new StringBuilder(sc.nextLine());
    StringBuilder str2 = new StringBuilder(sc.nextLine());
    for (int i = 0, size = Math.min(str1.length(), str2.length()); i < size; ++i)
        if (str1.charAt(i) == str2.charAt(i)) {
            str1.setCharAt(i, '*');
            str2.setCharAt(i, '*');
        }
    System.out.println("str1=" + str1 + " str2=" + str2);
}

input:

abcdefg
cbadex

output:

str1=a*c**fg str2=c*a**x

Answered By - saka1029 deleted