import java.util.Arrays;

public class CopyDemo {
    public static void main(String[] args) {
        int[] arr = {10,20,30,40,50,60,70,80};
        System.out.println("数组为："+ Arrays.toString(arr));
        // 复制到新的数组
        int[] newarry = Arrays.copyOf(arr,8);
        System.out.println("新的数组为"+Arrays.toString(newarry));
        // 复制到长度为10的新数组中
        int[] arry2 = Arrays.copyOf(arr,10);
        System.out.println("长度为10的数组："+Arrays.toString(arry2));
        // 变为长度为6个的数组
        int[] arry3 = Arrays.copyOf(arr,6);
        System.out.println("长度为6的数组："+Arrays.toString(arry3));
    }
}
import java.util.Arrays;

public class SortDemo {
    public static void main(String[] args) {
        int[] arr = {10,40,10,130,1,33,1123,4};
        Arrays.sort(arr);
        System.out.println("排序后的数组"+Arrays.toString(arr));

    }
}

Arryas工具的使用