Is subsequence

IsSubsequence.java

class Solution {
    public boolean isSubsequence(String s, String t) {
        if (s.isEmpty()) {
            return true;
        }
        
        int lastBreak = 0;
        int sIndex = 0;
        int tIndex = 0;
        int sLength = s.length();
        int tLength = t.length();
        
        while (sIndex < sLength) {
            char sChar = s.charAt(sIndex);
            
            while (tIndex < tLength) {
                if (t.charAt(tIndex) == sChar) {
                    if (sIndex == sLength - 1) {
                        return true;
                    }
                    
                    tIndex++;
                    break;
                }
                
                tIndex++;
            }
            
            sIndex++;
        }
        
        return false;
    }
}