入參檢查

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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...");}//產生10個隨機數5-9之間//傳回值類型：int[]//參數列表：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){//入參檢查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){//入參檢查if(array==null){System.out.println("傳入數組為空白");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;}}

　　

入參檢查