求数组的最大最小平均值

public class First {
public static void main(String[] args){
    int []a={2,1,3,4,5,6,7,8,9,11};
    int sum=0;
    for (int i=0;i<a.length-1;i++){
      for (int j=i+1;j<a.length;j++){
         if(a[i]>a[j]){
             int temp=a[i];
             a[i]=a[j];
             a[j]=temp;
         }

      }

    }
for(int i=0;i<a.length;i++){
System.out.println(a[i]);}
System.out.println("min"+a[0]);
System.out.println("max"+a[9]);
sum=a[0]+a[9];
System.out.println(sum/2);
}

}