Date: 2016mar12 Language: Java Keywords: Comparator Q. Java: How can I make my class work with Collections.sort() ? A. Implement Comparable like this:

import java.util.Collections; import java.lang.Comparable; import java.util.ArrayList; class MyEntry implements Comparable<MyEntry> { String member1; @Override int compareTo(CompanyEntry b) { return member1.compareTo(b.member1); } } void exampleUse() { ArrayList<MyEntry> a = new ArrayList<MyEntry>(); // Add things to the array Collections.sort(a); }