普通for循环
For-Each循环
数组作方法入参
数组作返回值
package com.lilili; public class Demo30_1 { public static void main(String[] args) { int[] arrays = {1,2,3,4,5,6,7}; //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("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为:"+sum); } } }
package com.lilili; public class Demo30_2 { public static void main(String[] args) { int[] arrays = {1,2,3,4,5}; //JDK1.5 ,没有下标 for (int array : arrays) { System.out.println(array); } printArray(arrays); 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.println(arrays[i]+" "); } } //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; } }