Need Help counting Similarities

[ivatanako]

import java.io.*;
 
public class myFLAMES {
	public static void main(String args[]) throws Exception
	{
		DataInputStream input=new DataInputStream(System.in);
		int ctr=0;
		
		/* ask for inputs */
		System.out.println("Input your name: ");
		String name = input.readLine();
		
		System.out.println("Input her name: ");
		String sname = input.readLine();
		
		/* hard part -PROCESSING!!!! */
		
		/* we need to compare this two names */
		
		for(i=0;i<name.length();i++)
        {
         	for(j=0;j<sname.length();j++)
         	{
           		if(name.charAt(i)==sname.charAt(j))
            	{
             	ctr++;
            	}
         	}
		}
		
		System.out.println("a: "+ctr);
		
	}
}

I need help for counting the number of similarities between the two strings.

Example:
if I entered JUAN, then JUANA.

The answer should be : 5

Because JUAN has 5 characters with JUANA, those are "J","U","A","N","A"

I was able to do that with my code and was correct.

But how will i count "JUANA" similarity with "JUAN"?

The answer should be: 4

because JUANA has 4 characters in common with JUAN and those are "J","U","A","N".

how do I do this? thanks

[nschessnerd]

import java.io.*;
 
public class myFLAMES {
    public static void main(String args[]) throws Exception
    {
        DataInputStream input=new DataInputStream(System.in);
        int ctr=0;
        
        /* ask for inputs */
        System.out.println("Input your name: ");
        String name = input.readLine();
        
        System.out.println("Input her name: ");
        String sname = input.readLine();
        
        /* hard part -PROCESSING!!!! */
        
        /* we need to compare this two names */
        
        for(i=0;i<name.length();i++)
        {
             for(j=0;j<sname.length();j++)
             {
                   if(name.charAt(i)==sname.charAt(j))
                {
                 ctr++;
j=sname.length();
                }
             }
        }
        
        System.out.println("a: "+ctr);
        
    }
}

basically once you find a match move to the next letter

also you may want to change the case of each string so it doesnt miss letters due to capitalization