数组的使用

public class ArrayDemo03 {
    public static void main(String[] args) {
        int[] arrays ={1,2,3,4,5};

        //打印全部的数组元素
        for (int i= 0;i< arrays.length;i++){
            System.out.println(arrays[i]);
        }
        System.out.println("========================");
        //计算所有元素的和
        int sum = 0;
        for (int i = 0; i < arrays.length; i++) {
            sum = sum+arrays[i];
        }
        System.out.println("总和为"+sum);
        System.out.println("========================");
        //查找最大元素
        int max = arrays[0];
        for (int i = 0; i < arrays.length; i++) {
            if (arrays[i]>max){
                max = arrays[i];

            }
        }
        System.out.println("max="+max);
    }
}


================================================================================

public class ArrayDemo04 {
    public static void main(String[] args) {
        int[] arrays = {1,2,3,4,5};
//              pringArray(arrays);

        int[] reverse = reverse(arrays);
        pringArray(reverse);

        //for增强型  省去下标 适用于打印
 //       for (int array : arrays) {
 //           System.out.print(array);
 //       }
    }
    //反转数组
    public static  int[] reverse(int[]arrays){
        int[] result = new int[arrays.length];

        //反转的操作
        for (int i = 0,j=result.length-1; i < arrays.length;i++,j--){
           result[j] = arrays[i];
        }

         return result;
    }
    //调用方法方式  打印数组元素
    public static void pringArray(int[]arrays){
       for (int i = 0; i < arrays.length; i++) {
            System.out.print(arrays[i]+" ");

        }
    }

}