public class arrayDemo04 {
public static void main(String[] args) {
int[] arr = {1,3,5,7,9};
//1.普通的for循环
//打印全部的数组元素
for (int i = 0; i < arr.length; i++) {
System.out.print(arr[i]+" ");
}
System.out.println();
//计算所有元素的总和
int sum = 0;
for (int i = 0; i < arr.length; i++) {
sum += arr[i];
}
System.out.println("sum = "+sum);
//查找最大值
int max = arr[0];
for (int i = 0; i < arr.length; i++) {
if(arr[i] > max){
max = arr[i];
}
}
System.out.println("max = "+max);
//2.for-each循环,没有下标
for (int i : arr) {
System.out.println("for-each循环打印:"+i);
}
}
}
public class arrayDemo05 {
public static void main(String[] args) {
int[] arr = {1,2,3,4,5};
printArray(arr);
System.out.println("==========");
int[] reverse = reverse(arr);
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];
for (int i = 0,j = arrays.length-1; i < arrays.length; i++,j--) {
result[j] = arrays[i];
}
return result;
}
}