入参检查

import java.util.Random;
public class Demo1{
	public static void main(String[] args) {
		int[] array = getRandom(3,9,-1);
		iterArray(array);
		System.out.println("end...");
	}
	//产生10个随机数5-9之间
	//返回值类型：int[]
	//参数列表：int min,int max,int count
	/**
	 * [getRandom description]
	 * @param  min   [description]
	 * @param  max   [description]
	 * @param  count [description]
	 * @return       [description]
	 */
	public static int[] getRandom(int min,int max,int count){
		//入参检查
		if(count<=0||min>=max){
			return null;
		}
		int[] array = new int[count];
		Random r = new Random();
		for(int i=0;i<count;i++){
			array[i] = r.nextInt(max-min+1)+min;
		}
		return array;
	}
	/**
	 * [iterArray description]
	 * @param array [description]
	 */
	public static void iterArray(int[] array){
		//入参检查
		if(array==null){
			System.out.println("传入数组为空");
			return;
		}
		for (int num:array) {
			System.out.print(num+" ");
		}
		System.out.println();
	}
	
	public static long sum(int[] a){
		long sum = 0;
		for (int num:a) {
			sum += num;
		}
		return sum;
	}
}