Authors:
Stuart Reges, Marty Stepp
Chapter:
Arrays
Exercise:
Exercises
Question:11 | ISBN:9780136091813 | Edition: 2
Question
Write a method called isUnique that accepts an array of integers as a parameter and returns a boolean value indicating whether or not the values in the array are unique ( true for yes, false for no). The values in the list are con-
sidered unique if there is no pair of values that are equal. For example, if passed an array containing {3, 8, 12, 2, 9, 17, 43, -8, 46}, your method should return true , but if passed {4, 7, 3, 9, 12, -47, 3, 74}, your method should return false because the value 3 appears twice.
Answer
Implementation of isUnique method:
public static boolean isUnique(int[] a)
{
for(int i = 0; i < a.length - 1; i++)
{
for(int j = i + 1; j < a.length; j++)
{
if(a[i] == a[j])
return false;
}
}
return true;
}