How to use Comparable Interface

最新推荐文章于 2025-03-31 16:53:39 发布

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本文介绍如何通过实现Comparable接口并覆盖compareTo方法来对员工对象列表进行排序。示例代码展示了基于薪资字段对Employee对象进行排序的过程。

List of objects that implement this interface can be sorted automatically by sort method of the list interface. This interface has compareTo() method that is used by the sort() method of the list.

In this code Employee class is implementing Comparable interface and have method compareTo(). ComparableDemo.java is showing the use of this interface. This class first makes a list of objects of type Employee and call sort method of java.util.Collections, which internally uses compareTo() method of Employee class and sort the list accordingly.

If you defined Comparable<T>, you need to use Employee e in function ‘publicint compareTo(Employee e) {‘ argument.

package algorithms;

publicclass Employee implements Comparable<Employee>{

intEmpID;

String Ename;

doubleSalary;

staticinti;

public Employee(String ename,double salary){

EmpID=i++;

Ename=ename;

Salary=salary;

}