characters + strings

[Gilgamesh]

i have a String and i want to test if there is at least one (different) character that is repeated three times (or more) consequently

e.g. aaabcde->true
abbbcde->true
abbbcdddde->true

i have to use 1) the charAt(), 2) substring(), 3) length()

Code:

...String s=readLine("type a string.");
		if (s.length()>=3){
			int i=0;
			for (i=0; i<s.length()-2;i++){ 			
		/**i am stuck here	(how to say substring(i, i+2) equals to three times the charAt(i)	*/			                                     println("true");
					break;
				}
				}
												
			}else{ println("false");
		}...

[roots]

Code:

		if (s.length() >= 3) {
			for (int i = 0; i < s.length() - 2; i++) {

				char c = s.charAt(i);
				String desired = "" + c + c + c;
				String actual = s.substring(i, i + 3);

				if (desired.equals(actual)) {
					// It matched ..
					System.out.println("True");
				}
			}

		}

[Gilgamesh]

by the way, i understand that the "" here: String desired=""+c+c+c; makes a String containing this ccc , but how?

thank you

[roots]

char + char is is taken as integer addition. This code,
char d = 'a' ;
System.out.println(d+d);

Will print 194

"" Will make all other following to be converted to String. Try with int as well.