Java实现特定范围的完数输出算法示例

import java.util.Scanner;
public class Main {
  //判断是否是完数
  public static boolean isFinishedNum(int n)
  {
    //排除干扰1、2
    if((n==1)||(n==2))
      return false;
    boolean isFinishedNum = false;
    int sum=1;
    for(int i =2;i<n;i++)
    {
      if(n%i==0)
        sum+=i;
    }
    //如果相等就是完数
    if(sum==n)
      isFinishedNum = true;
    return isFinishedNum;
  }
  public static void main(String[] args) {
    // TODO Auto-generated method stub
    System.out.println("脚本之家 - 特定范围内的完数输出测试：");
    Scanner in = new Scanner(System.in);
    int n = in.nextInt();
    int m = in.nextInt();
    String out = " ";
    for(int i =n;i<=m;i++)
    {
      if(isFinishedNum(i))
        out = out+i+" ";
    }
    //去除out左右两边的空格
    out=out.trim();
    System.out.println(out);
    in.close();
  }
}