2024/04/25

package staticDemo1;

public class Test1 {
    public static void main(String[] args) {
        int[] arr1={1,2,3,4,5};
        System.out.println(Arrunit.printArr(arr1));
        double[] arr2={1.1,2.2,3.3,4.4};
        System.out.println(Arrunit.acv(arr2));
    }
}

package staticDemo1;

public class Arrunit {
    private Arrunit(){
    }
    public static String printArr(int[] arr){
        StringBuilder sb = new StringBuilder();
        sb.append("[");
        for (int i = 0; i < arr.length; i++) {
            if(i==arr.length-1){
                sb.append(arr[i]);
            }else {
                sb.append(arr[i]);
                sb.append(",");
            }
        }
        sb.append("]");
        return sb.toString();
    }
    public static double acv(double[] arr){
        double sum=0;
        for (int i = 0; i < arr.length; i++) {
            sum=sum + arr[i];
        }
        return sum/arr.length;
    }
}

写了一个数组的工具类