I'm trying to do this:
User inputs a number for example 2013 or 2012 and it checks if the number has any reoccurring digits like in 2012 there is 2 but I don't know where to go from here.
public static boolean hasDuplicates(String text){
for(int i = 0; i < text.length() - 1; i++){
for(int j = i + 1; j < text.length(); j ++){
if(text.charAt(i) == text.charAt(j)){
return true;
}
}
}
return false;
}
You can make it this way:
public static boolean containsDuplicate(int number) {
String strNum = number.toString();
for(int i=0; i < strNum.length() -1 ; i++){
if( containsDuplicatedValue(strNum, strNum.charAt(i) )
return true;
}
return false;
}
private static boolean containsDuplicatedValue(String str, char searchFor) {
return str.indexOf(searchFor) != str.lastIndexOf(searchFor);
}
Here is a way to check for duplicates. If the first occurrence of number
has a different index than the last occurrence, then number
must occur more than once.
public static boolean containsDuplicate(String str, int number) {
return str.indexOf(number) != str.lastIndexOf(number);
}
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