Given two strings S1 and S2. Delete from S2 all those characters which occur in S1 also and finally create a clean S2 with the relevant characters deleted.

public class StringManipulation {
 public static void main(String args[]) {
  String s1 = "ba";
   String s2 = "cbaaaabbcaaaa";
   
   
   for (int i = 0; i < s1.length(); i++) {
    for (int j = 0; j>=0 && s2.length()>0 &&j < s2.length(); j++) {
    
     while(s1.charAt(i) ==s2.charAt(j)){//处理连续状况
      s2 = s2.substring(0, j) + s2.substring(j + 1);
        j--;
        System.out.println(s2+s2.length()+"  "+j);
        if(j<0){j=0;}
        if(s2.equals(""))break;
     }
    }
   }  System.out.println(s2+"!!!");
 }
}