mirror of https://github.com/Black-Gold/Learn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
77 lines
1.4 KiB
77 lines
1.4 KiB
/**
|
|
文档注释
|
|
创建一个操作数组的工具类，包含对数组操作的函数
|
|
@author XiaoMing
|
|
@version V1.0
|
|
*/
|
|
|
|
public class Jb23_ArrTool
|
|
{
|
|
/*该类的方法都是静态的，固该类不需要创建对象，节省内存
|
|
为了确保不让其他程序创建该类对象，将该类的构造函数进行初始化。*/
|
|
private Jb23_ArrTool(){}
|
|
|
|
/**获取整数数组的最大值
|
|
@param arr 接收一个元素为int类型的数组
|
|
@return 该数组中的最大元素值*/
|
|
public static int getMax(int[] arr)
|
|
{
|
|
int maxIndex = 0;
|
|
for (int x=1;x<arr.length ;x++ )
|
|
{
|
|
if (arr[x]>arr[maxIndex])
|
|
{
|
|
arr[maxIndex] = arr[x];
|
|
}
|
|
}
|
|
return arr[maxIndex];
|
|
}
|
|
//数组选择排序
|
|
public static void selectSort(int[] arr)
|
|
{
|
|
for (int x=0;x<arr.length-1 ;x++ )
|
|
{
|
|
for (int y=x+1; y<arr.length; y++)
|
|
{
|
|
if (arr[x]>arr[y])
|
|
{
|
|
swap(arr,x,y);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
//数组元素的位置换位
|
|
public static void swap (int[] arr,int x,int y)
|
|
{
|
|
int temp = arr[x];
|
|
arr[x] = arr[y];
|
|
arr[y] = temp;
|
|
}
|
|
//获取指定元素在指定数组的角标，不存在返回-1
|
|
public static int getIndex(int[] arr,int key)
|
|
{
|
|
for (int x=0;x<arr.length ;x++ )
|
|
{
|
|
if (arr[x]==key)
|
|
{
|
|
return x;
|
|
}
|
|
}
|
|
return -1;
|
|
}
|
|
//将int数组转换成字符串
|
|
public static String arrayToString(int[] arr)
|
|
{
|
|
String s = "";
|
|
for (int x=0; x<arr.length;x++ )
|
|
{
|
|
if (x!=arr.length-1)
|
|
s = s + arr[x]+",";
|
|
else
|
|
s = s + arr[x];
|
|
}
|
|
return s;
|
|
}
|
|
}
|
|
|