Tester si un String est un entier

public class IntTester {

	public static boolean isValidInt(String str) {
		boolean isValid = false;
		try {
			Integer newInput = Integer.valueOf(str);
			int i = newInput.intValue();
			isValid = true;
		} finally {
			return isValid;
		}
	}

	public static void main(String[] args) {
		String toTest = "1234";
		System.out.println(toTest + " est-il un entier valide? " + IntTester.isValidInt(toTest));
		toTest = "125r";
		System.out.println(toTest + " est-il un entier valide? " + IntTester.isValidInt(toTest));
		toTest = "rez";
		System.out.println(toTest + " est-il un entier valide? " + IntTester.isValidInt(toTest));
		toTest = "1.23";
		System.out.println(toTest + " est-il un entier valide? " + IntTester.isValidInt(toTest));
	}
}