数组的使用

数组的使用

1.普通的For循环

2.For-Each循环

3.数组作方法入参

4.数组作返回值

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

        //普通for循环
        for (int i=0;i<cities.length;i++){
            System.out.print(cities[i]+" ");
        }

        System.out.println("\n========================");

        //for-each循环只用于简单的读取数组中的内容
        for (String temp:cities){
            System.out.print(temp+" ");
        }

        System.out.println("\n========================");
        //反转数组
       int[] reverse = reverse(arrays);
        printArray(reverse);
    }

    //反转数组
    public static int[] reverse(int[] arrays){
        int[] result = new int[arrays.length];

        for (int i=0,j= result.length-1; i< arrays.length; i++,j--){
            result[j] = arrays[i];
        }
        return result; //数组作返回值
    }

    //数组作方法入参
    public static void printArray(int[] arraus){
        for (int i=0; i<arraus.length; i++){
            System.out.print(arraus[i]+" ");
        }
    }
}