java的toString方法和sort方法

public class arrayTool {
public static String toString(int arr[]){
String result = "";
for(int i = 0;i < arr.length;i++)
{
if(i == 0)
{
result+="["+arr[i]+",";
}
else if(i == arr.length-1)
{
result+=arr[i]+"]";
}
}
return result;
}
public static void sort(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 tmp = arr[j];
arr[j] = arr[j+1];
arr[j+1] = tmp;
}
}
}

}
}