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comparator and comparable in java interview questions

comparator and comparable in java interview questions

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Java Learning notes--comparable & Comparator

Comparablethe timeTo implement this interface while implementing the comparison method, and for classes that cannot modify the source code, this method cannot be used for comparison sorting, and so on. The source code is:1 Public Interface Comparable {2public int compareTo (T o); 3 }You can use comparisons such as Arrays.sort (t[] a) or collections.sort (list Public Interface Comparator { int comp

A comparison of objects in a Java collection comparable and comparator

There are two ways to sort a property of an object in a collection. A. One is to sort the object class to implement the comparable interface CompareTo method, then put the object into the list, then call Collections.sort (list);B. One is not to make any changes to the Sort object class, create the implementation class C of the comparator interface, then put the object into the list, and then call Collection

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