一维数组的Array_Tool - 黑马程序员技术交流社区

import java.util.Scanner;
class Array_Tool{
public static void main(String[] args) {
int []arr = {1, 2, 3, 5, 2, 8, 9, 5, 25, 12, 4, 6, 9, 58, 59, 23, 18, 19 ,29, 56};
Scanner sc = new Scanner(System.in);
System.out.println("请输入你想得到的结果：1（数组冒泡排序）/2（数组获取最大值）/3（数组反转）:");
int a = sc.nextInt();
if (a == 1) {
System.out.println("数组冒泡排序后的元素为：");
bubbleSort(arr);
for (int i=0; i<arr.length; ++i){
System.out.println(arr[i]);
}
}else if (a == 2) {
System.out.println("获取元素的最大值为：" + getMax(arr));
}else if (a == 3) {
reverseArr(arr);
System.out.println("数组反转排序后的元素为：");
for (int i=0; i<arr.length; ++i){
System.out.println(arr[i]);
}
}else {
System.out.println("输入错误");
}
}
public static void bubbleSort(int [] arr) {
for (int i=0; i<arr.length-1; ++i){
for (int j=0; j<arr.length-1-i; ++j){
if (arr[j] > arr[j+1]) {
int temp = arr[j];
arr[j] = arr[j+1];
arr[j+1] = temp;
}
}
}
}
public static int getMax(int []arr) {
int max = arr[0];
for (int i=1; i<arr.length; ++i){
if (max < arr[i]) {
max = arr[i];
}
}
return max;
}
public static void reverseArr(int [] arr) {
for (int i=0; i<arr.length / 2; ++i){
int temp = arr[i];
arr[i] = arr[arr.length - 1 - i];
arr[arr.length - 1 - i] = temp;
}
}
}

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