数组的使用

普通的for循环

package com.tiepi;

public class ArrayDemo {
    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]);
        }
        //计算所有元素的和
        for (int i = 0; i < arrays.length; i++) {
            sum += arrays[i];
        }
        System.out.println("总和为：" + sum);
        //查找最大元素
        for (int i = 0; i < arrays.length ; i++) {
            if (arrays[i]>max){
                max = arrays[i];
            }
        }
        System.out.println("最大值为：" + max);
    }
}

for-each循环

package com.tiepi;

public class ArrayDemo {
    //打印数组元素
    public static void printArray(int[] arrays){
        //增强for循环
        for (int array : arrays) {
            System.out.print(array+" ");
        }
    }
    public static void main(String[] args) {
        int[] arrays = {1,2,3,4,5};
        printArray(arrays);
    }
}

数组作方法入参

package com.tiepi;

public class ArrayDemo {
    //打印数组元素
    public static void printArray(int[] arrays){
        //增强for循环
        for (int array : arrays) {
            System.out.print(array+" ");
        }
    }
    public static void main(String[] args) {
        int[] arrays = {1,2,3,4,5};
        printArray(arrays);
    }
}

数组作返回值

package com.tiepi;

public class ArrayDemo {

    //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;
    }

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

        int[] reverse = reverse(arrays);
        for (int re : reverse) {
            System.out.print(re+" ");
        }

    }
}