Java学习基础-数组-使用数组

使用数组

package com.array;
//使用数组
public class ArrayDemo03 {
    public static void main(String[] args) {
        int[] arrays = {1,2,3,4,5};
        //1.打印全部数组元素
        for (int i = 0; i < arrays.length; i++) {
            System.out.println(arrays[i]);
        }
        System.out.println("====================");
        //2.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);
        //3.查找最大元素
        System.out.println("====================");
        int max = arrays[0];
        for (int i = 1; i < arrays.length; i++) {
            if (arrays[i]>max){
                max = arrays[i];
            }
        }
        System.out.println("最大值是："+max);
    }
}

package com.array.Array;

public class ArrayDemo04 {
    public static void main(String[] args) {
        int[] arrays = {1,2,3,4,5};
//        //JDK1.2，没有下标，增强型FOR循环
//        for (int array : arrays) {//arrays.for
//            System.out.println(array);
//        }
        int[] reverse = reverse(arrays);
        printArray(reverse);
    }
    //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]+" ");

        }
    }
    //反转数组
    public static int[]


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