String s1 = "abc";String s2 = "xyzc";char[] c1,c2;c1 = s1.toCharArray();c2 = s1.toCharArray();for(int i=0; i<c1.length(); i++) { char cc = c1[i]; for(int j=0; j<c2.length(); j++) { char cc2 = c2[j]; if(cc1.equals(cc2)) System.out.println("char: " +cc1+ " in beiden Strings vorhanden!!"); else System.out.println("char in beiden Strings nicht vorhanden!!"); }}