Java允许重载任何方法:
package com.company; import java.util.*; public class Main { public static void main(String[] args) { // write your code here Employee[] staff=new Employee[3]; staff[0]=new Employee("Harry",4000); staff[1]=new Employee(6000); staff[2]=new Employee(); for (Employee e:staff) { System.out.println("name="+e.getName()+",id="+e.getId()+",salary"+e.getSalary()); } } } class Employee{ private static int nextId; private int id; private String name=""; private double salary; static{ Random generator=new Random(); nextId=generator.nextInt(10000); } { id=nextId; nextId++; } public Employee(String n,double s){ name=n; salary=s; } public Employee(double s){ this("Employee#"+nextId,s); } public Employee(){} public String getName(){ return name; } public double getSalary(){ return salary; } public int getId(){ return id; } }
演示结果:
name=Harry,id=2625,salary4000.0
name=Employee#2626,id=2626,salary6000.0
name=,id=2627,salary0.0