creating methods

[Mike Smith]

Hello all, I am trying to create methods that perform certain computations. Some of the methods have already been written for a previous assignment. However, I am to insert 2 of these methods into a class; and be able to invoke these methods from other classes I write. SO I have to edit the return type of each method; and edit the method to accomadate the class it will be in. When I write new classes, does my class file that contains these methods need to be placed in the same directory(folder) as the new class for which I am writting. I assume so. But for some odd reason I am getting an error while trying to invoke one of these methods in another class file. THis is what I have so far. Maybe someone could shed some light on what I am doing wrong. I would like to test each method in myUtils file class to make sure it returns what it is suppose to. SO I am creating little programs on the side to test it. Anyways, here is what I got.
This is my test class.

public class testisInteger{
 
public static void main (String [] args) {
 
String a = new String(Stdin.readln());;
 
boolean test = a.isInteger();
 

System.out.println(test);
 

}
 

public static boolean isInteger( String s ) {
 
// Body of method isInteger
 
s = Stdin.readln();
boolean a= true;
int i = 0;
 
while(i < s.length() && a){
 
// check every character in string.
char ch = s.charAt(i);
 
// if +-integer print out "This is an integer"
// otherwise not an integer.
a=(ch=='-' ||ch >= '0' && ch <= '9');
i=i+1;
}
if(a){
return true;
}else{
return false;
}
}
 

}
 

  

Furthermore, this is my class containing the methods I wish to invoke.

  public class MyUtils {
 
public static boolean isInteger( String s ) {
 
// Body of method isInteger
 
s = Stdin.readln();
boolean a= true;
int i = 0;
 
while(i < s.length() && a){
 
// check every character in string.
char ch = s.charAt(i);
 
// if +-integer print out "This is an integer"
// otherwise not an integer.
a=(ch=='-' ||ch >= '0' && ch <= '9');
i=i+1;
}
if(a){
return true;
}else{
return false;
}
}
 

 

 

public static int readInteger( String text, int start, int end ) {
//Body of method readInteger
  //int i = 0;
  //while(
 

return 0;
}
 
public static boolean validMove( char [] board, int move ) {
 

return false;
}
 
public static boolean winningMove( char [] board, int move, char turn ) {
 

return false;
}
 

 
}
 

[Henry Wong]

It would help if you mention what the is exception that you are encountering.

However, at a quick glance, you are trying to call an isInteger() method of the String class -- which is not possible.

Henry

[Mike Smith]

OOps, thanks for noticing. I will try to debug the problem. My question I guess wasn't clear. Thats okay, i'll keep you posted. thanks again.