数组的使用

package zaiyang.array;

public class ArrayDemo03 {
    public static void main(String[] args) {
        int[] arrays = {10,2,8,4,5};

        //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 += arrays[i];
        }
        System.out.println("sum="+sum);

        System.out.println("=====================================");
        //查找最大元素
        int max = arrays[0];

        for (int i = 1; i < arrays.length; i++) {
            if (arrays[i]>max){
                max = arrays[i];
            }
        }
        System.out.println("max="+max);
    }
}

package zaiyang.array;

public class ArrayDemo04 {
    public static void main(String[] args) {
        int[] arrays = {1,3,4,5,6};
        //JDK1.5, 没有下标
  //      for (int array : arrays) {
  //          System.out.println(array);

 //       }
   //     printArray(arrays);

        int[] reverse = reverse(arrays);
        printArray(reverse);
    }

    //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;

    }

    //打印数组元素
    public static void printArray(int[] arrays){
        for (int i = 0; i < arrays.length; i++) {
            System.out.print(arrays[i]+" ");

        }
    }
}