java可变参数

package exercise03_jdknews;

import java.util.ArrayList;
import java.util.Scanner;

/**
* 可变参数
* 格式
*      修饰符 返回值类型 方法名(数据类型... 变量名){}
* @author lgt
*
*/
public class KebianCanShu {
public static void main(String[] args) {
int a = 20;
int b = 23;
int result1 = sum(a,b);

System.out.println(result1);

//可变参数的调用类型
System.out.println("可变参数的调用类型");
System.out.println(sum1(1,2,3,4,5,6,7,8,9,10));
int[] i1 = {1,23, 32,3};
int[] i2 = {2,3,4,5,6,7,8,9,10};
int[] i3 = {1,2,3,4,5,6,7,8,9,10};
System.out.println("参数个数为：" + i1.length + "，sum1(i1) 其和为：" + sum1(i1));
System.out.println("参数个数为：" + i2.length + "，sum1(i2) 其和为：" + sum1(i2));
System.out.println("参数个数为：" + i3.length + "，sum1(i3) 其和为：" + sum1(i3));

//输入几个整数，求和，个数不确定方式2
System.out.println("输入几个整数，求和，个数不确定方式2");
Scanner sc = new Scanner(System.in);
ArrayList<Integer> list = new ArrayList<Integer>();
while(true){
Integer x = sc.nextInt();
if(x != 0){
list.add(x);
}else{
break;
}
}
sc.close();
System.out.println(sum2(list));

}
public static int sum(int a, int b){
return a+b;
}

public static int sum1(int... a){
int sum = 0;
for(int i : a){
sum += i;
}
return sum;
}

public static Integer sum2(ArrayList<Integer> list){
Integer sum = 0;
for(Integer i : list){
sum += i;
}
return sum;
}
}