递归方法慎用

package cn.demo;

public class Recursion {

	/**
	 * recursion
	 */
	public static long recursion(int sum){
		if (sum==0) {
			return sum;
		}
		return sum+recursion(sum-1);
	}
	public static void main(String[] args) {
		long result= recursion(100000);
		System.out.println(result);
	}

}