Comparatorcan be used if you want to compare objects based on certain attributes/fields. For example, 2 persons can be compared based on `height` or `age` etc. (this can not be done using comparable.)
MyComparator实现了Comparator的compare 方法 因为其他的类包含了排序的逻辑,所以我们需要提供了Comparator 的实现了给Collections.sort 方法,例如Collections.sort(empList, new MyComparator()); Comparator 的实现类可以给我们提供了扩展其他排序的能力,因为这个时候你可以选择使用Comparable 的自然排序或者是Comparator 提供...
To use the Comparator interface, the class has to implement the method compare(). It can be used to compare two objects in a way that might not align with the natural order of the object. For example, import java.io.*; import java.lang.*; import java.util.*; class Employee { int ...
Java provides two interfaces to sort objects using data members of the class: Comparable Comparator Using Comparable Interface A comparable object is capable of comparing itself with another object. The class itself must implements thejava.lang.Comparableinterface to compare its instances. ...
比较器排序Comparator的使用 与 自然排序Comparable的使用 有什么区别,程序员大本营,技术文章内容聚合第一站。
import java.util.Comparator; public class Employee implements Comparable<Employee> { private int id; private String name; private int age; private long salary; public int getId() { return id; } public String getName() { return name;
java.util.Collections.sort(List, Comparator) and java.util.Arrays.sort(Object[], Comparator) methods can be used if a Comparator is available for comparison. The above explained Employee example is a good candidate for explaining these two concepts. First we’ll write a simple Java bean to re...
When working with custom types, or trying to compare objects that aren’t directly comparable, we need to make use of a comparison strategy. We can build one simply by making use of theComparatororComparableinterfaces. 2. Setting Up the Example ...
Dive into the nuances of Java programming by exploring the essential concepts of Comparable and Comparator. Learn how these interfaces facilitate object sorting, providing flexibility and customization in your Java applications.
Example://Java program for Comparator import java.io.*; import java.util.*; // Class 'Customer' implements Comparable class Customer implements Comparable<Customer>{ //Variable Declaration private String name; private int age; private int bill; //Function to compare values start public int ...