Primitive data types aren't classes and have no methods you can call. but if you want to use compareTo just create a Double array. Double[] dist = new Double[centroids.size()]; 回答3: In java primitive types don't have any methods. Compares values and returns an int which tells if the values compare less than, equal, or greater than. You compare Java primitives (int, long, double, etc.) The compareTo() method of Java Boolean class compares the Boolean instance with the Boolean argument and returns … In order to sort a collection of objects (using some property) in Java, we can use the java.lang.Comparable interface which imposes a natural ordering on the objects of each class that implements it. ... public int compareTo( NumberSubClass referenceName ) Parameters. The best treatment of the issues is in Horstmann's Core Java Vol 1. using the operators <, <=, ==, =>, >.That does not work for objects. The compareTo() method of Integer class of java.lang package compares two Integer objects numerically and returns the value 0 if this Integer is equal to the argument Integer; a value less than 0 if this Integer is numerically less than the argument Integer; and a value greater than 0 if this Integer is numerically greater than the argument Integer (signed comparison). This tutorial helps you how to use the Arrays utility class to sort elements in an array.. You know, the java.util.Arrays class provides various methods for sorting elements of an array, as simple as:. Arrays.sort(array) This tutorial shows various examples of sorting an array using such methods, especially using the Comparable and Comparator interfaces. For objects, you either use a compare or a compareTo method instead. Autoboxing is the automatic conversion that the Java compiler makes between the primitive types and their corresponding object wrapper classes. [TODO: Add explanation and example] a.compareTo(b) N/A : Comparable interface. Here is the simplest example of autoboxing: It returns 0 if a equals b, and it returns a positive int if a > b. You have to encapsulate your int in an instance of the class java.lang.Integer 二. Comparable
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