方法调用-排序

class ArrayUtil{
    public void sort(int []arr ){
        for (int i=0;i<arr.length;i++){
            for (int j=0;j<arr.length-i;j++){
                int t=arr[j];
                arr[j]=arr[i];
                arr[i]=t;
            }
        }
    }
}
public class Test02 {
    public static void main(String[] args) {
        int []arr={1,9,6,23};
        ArrayUtil a=new ArrayUtil();
        for (int i=0;i<arr.length;i++){
            System.out.print(arr[i]+" ");
        }
    }
}