Java递归算法——三角数字

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

//=================================================
// File Name       :	triangle_demo
//------------------------------------------------------------------------------
// Author          :	Common

//类名：
//属性：
//方法：


//主类
//Function        : 	triangle_demo
public class triangle_demo {
	
	//static int theNumber;
	
	public static void main(String[] args) throws Exception{
		// TODO 自动生成的方法存根
		System.out.println("输入数字：");
		int theNumber = getInt();
		int theAnswer = triangle(theNumber); 
		System.out.println("三角上每一行的数量："+theAnswer);
	}
	
	public static int triangle(int n){		//递归输出1 3 6 10....
		if(n==1)
			return 1;
		else
			return (n + triangle(n-1));
	}
	
	
	//输出方法
	public static String getString() throws IOException{
		InputStreamReader isr = new InputStreamReader(System.in);
		BufferedReader br = new BufferedReader(isr);
		String s = br.readLine();
		return s;
	}
	
	//输出方法
	public static int getInt() throws IOException{
		String s = getString();
		return Integer.parseInt(s);
		
	}

}