JM Chapter 10 #15

Write a method that tests whether a given string contains only digits.

JM Chapter 10 #15

"12345", true
"123h5", false
"", false
"1", true
"23fr", false
"fuwge", false
"o", false
"019347019", true
"ofihwioef1924109471902fhiohfio", false
"19824612894hi12481924619a124891924", false
"89198498189", true

private boolean isNumerical(String str){
	if(str.length() < 1)
		return false;
	for (int i = 0; i < str.length(); i++) {
		if(!Character.isDigit(str.charAt(i)))
			return false;
	}
	return true;
}