求一个数组中的最小值与次小值

给定一个数组，无重复值，求数组中元素的最小值与次小值

public static void main(String[] args) {
    
    
        Scanner in=new Scanner(System.in);
        int n=in.nextInt();
        int [] a=new int[n];
        for (int i = 0; i < n; i++) {
    
    
            a[i]=in.nextInt();
        }
        int[] mins = minAndTwo(a);
        for (int i = 0; i < mins.length; i++) {
    
    
            System.out.print(mins[i]+" ");
        }
    }

    private static int [] minAndTwo(int [] arr){
    
    
        //  res[0]最小，res[1]次小
        int [] res={
    
    -1,-1};
        if (arr.length==0){
    
    
            return res;
        }
        res[0]=arr[0];
        if (arr.length==1){
    
    
            return res;
        }
        res[1]=arr[1];
        if (res[1]<res[0]){
    
    
            swap(res,0,1);
        }

        for (int i=2;i<arr.length;i++){
    
    
            if (arr[i]<res[0]){
    
    
                res[1]=res[0];
                res[0]=arr[i];
            }else if (arr[i]<res[1]){
    
    
                res[1]=arr[i];
            }
        }

        return res;
    }

    private static void swap(int [] a,int x,int y){
    
    
        int t=a[x];
        a[x]=a[y];
        a[y]=t;
    }