可变参数

import java.util.Arrays;
import java.util.List;

import org.junit.Test;



public class Demo {

    /**
     * 可变参数
     */
    @Test
    public void testSum(){
        //int arr[] = {1,2,3,4,5,6}
        sum(1,2,3,4,5,6);
        
    }

    //可变参数注意的问题：public void aa(int ....,int x){} 这样不行
    private void sum(int ...nums) {
        //可变参数就把他看成数组
        int sum = 0;
        for(int i : nums){
            
            sum+=i;
        }
        
        System.out.println(sum);
        
    }
    
    @Test
    public void bb(){
        
        List list = Arrays.asList("1","2","3");
        System.out.println(list);
        
        String arr[] = {"1","2","3","4"};
        list  = Arrays.asList(arr);
        System.out.println(list);
        
        int nums[] = {1,2,3,5};//这个细节一定要小心
        list = Arrays.asList(nums);
        System.out.println(list);
        
        
    }

    
    
    
}