char vars may inserted as method parameters ?

[leonidassavvides]

char vars may inserted as method parameters ?
int setAAA (int varAAA) {...} the first int in a setter is error ?
void is required whereas we have no return data ?
char vars may compared with == or need...?
constructors may output text ? but no return data ?
why does not compile the below:

class Test2
{
public static void main(String[] args)
{
char grade = 'A';

int process(char grade)
{
int points = (grade == 'A' ? 4 : 3);
return points;
}

System.out.println(process(grade));

}
}

[techietim]

class Test2
{
	public static void main(String[] args)
	{
		char grade = 'A';	
		System.out.println(process(grade));
	}
	private static int process(char grade)
	{
		int points = (grade == 'A' ? 4 : 3);
		return points;
	}
}