Program with multiple classes

[corona]

I have a big lejos program which spanns multiple classes

Code: Select all

package testing;

public class Class2 {
   private int i;
   public Class2(int i) {
      this.i = i;
   }
   public int getI() {
      return i;
   }
}


The above class is used by this class

Code: Select all

package testing;

import lejos.nxt.LCD;
import lejos.nxt.Button;

public class Class1 {

   public static void main(String args[]) {
      Class2 c2 = new Class2(42);
      int i = c2.getI();
      LCD.clear();
      while(!Button.ESCAPE.isPressed()) {
         LCD.drawInt(i, 4, 2);
         LCD.refresh();
      }
   }
}


Now, if I nxjc compile Class1 I get the following:

Class1.java:9: cannot find symbol
symbol : class Class2
location: class testing.Class1
Class2 c2 = new Class2(42);

I have tried nxjc Class2.java first, which seems fine, but compilation of Class1 cannot complete.
I have also tried nxj Class2 but that doesn't work since Class2 doesn't have a main method. I would really not like to hack it with an empty main().

How do I compile my program so Class1 knows Class2?

Thanks

[corona]

Is making an inner class like this the only solution?

Code: Select all

package testing;

import lejos.nxt.LCD;
import lejos.nxt.Button;

public class Class1 {
   class Class2 {
      private int i;
      public Class2(int i) {
         this.i = i;
      }
      public int getI() {
         return i;
      }
   }
   
   public static void main(String args[]) {
      Class1 c1 = new Class1();
      Class2 c2 = c1.new Class2(42);
      int i = c2.getI();
      LCD.clear();
      while(!Button.ESCAPE.isPressed()) {
         LCD.drawInt(i, 3, 4);
         LCD.refresh();
      }
   }
}


[esmetaman]

My alternative solution is the following:

Code: Select all

import lejos.nxt.LCD;
import lejos.nxt.Button;

public class Class1 {

   public static void main(String args[]) {
      Class2 c2 = new Class2(42);
      int i = c2.getI();
      LCD.clear();
      while(!Button.ESCAPE.isPressed()) {
         LCD.drawInt(i, 4, 2);
         LCD.refresh();
      }
   }
}



Code: Select all

public class Class2 {
   private int i;
   public Class2(int i) {
      this.i = i;
   }
   public int getI() {
      return i;
   }
}


[corona]

Thanks for your reply

However, I found out that using nxjc *.java does the trick, without inner classes

[esmetaman]

HI,

My code example tried to show two separate classes. When you try to compile use the command nxjc Class1.java because that class includes main method.

[bbagnall]

Compile class 2 before compiling class 1 and it will work.