20-可變參數

package demo;import java.util.Arrays;import java.util.List;import org.junit.Test;//可變參數public class DemoArgs {@Testpublic void testSum() {sum(1, 2, 3, 4, 5, 6);}// 1.將可變參數看成數組public void sum(int... nums) {int sum = 0;for (int i : nums) {sum += i;}System.out.println(sum);}/** * 2.public void aa(int...nums,int x)不可以 public void aa(int...nums,int x)可以 *  * @param x * @param nums */public void aa(int x, int... nums) {}// 數群組轉換為集合的方法Arrays.asList（對象數組）@Testpublic void bb() {String[] strs = { "1", "2", "3" };List list = Arrays.asList(strs);System.out.println(list);}@Testpublic void cc() {int[] nums = { 1, 2, 3 };// aslist()中只能放入對象數組，不能放入基礎資料型別 (Elementary Data Type)的數組,可以改變為integer數組List list = Arrays.asList(nums);System.out.println(list);}}