不能取消引用charAt（）。compareTo（）

Question

public static void main(String[] args)
{
    Scanner in= new Scanner(System.in);
    String time= in.nextLine();
    String arr[]=time.split(":");
   // System.out.println(arr[0]);
    String PM="P";
    if(!(arr[2].charAt(2)).compareTo(PM)) //I get an error here 
        {
        arr[0]+=12;
        System.out.print(arr[0]+":"+arr[1]+":"+arr[2]);
    }
    if((arr[2].charAt(2)).compareTo(PM)!=0) //I get an error here
        {
        System.out.print(arr[0]+":"+arr[1]+":"+arr[2]);
    }
}

Please help me remove errors ! What i basically have to check is if time input has AM or PM.

Answer 1

char doesn't have a compareTo method - or any methods, for that matter, since it is a primitive.

You can compare primitives using relational operators like < , > and == .

Since PM is a single-character string, you can also change its type to char:

char PM = 'P';

and then just use != to compare, eg

if (arr[2].charAt(2) != PM) {
   // .. whatever.

Answer 2

.charAt() returns a char , and the char behaves like at smaller int try to use this:

   if(!(arr[2].charAt(2) == PM.charAt(0))) {
    ...

Instead of:

   if(!(arr[2].charAt(2)).compareTo(PM))