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public class Ref{
   public static void main(String argv[]){
      Ref r = new Ref();
      r.amethod(r);
   }
   public void amethod(Ref r){
      int i=99;
      multi(r);
      System.out.println(i);
   }
   public void mult(Ref r){
      r.i = r.i*2;
   }
}
 

Main.java:1: error: class Ref is public, should be declared in a file named Ref.java
public class Ref{
       ^
Main.java:8: error: cannot find symbol
      multi(r);
      ^
  symbol:   method multi(Ref)
  location: class Ref
Main.java:12: error: cannot find symbol
      r.i = r.i*2;
       ^
  symbol:   variable i
  location: variable r of type Ref
Main.java:12: error: cannot find symbol
      r.i = r.i*2;
             ^
  symbol:   variable i
  location: variable r of type Ref
4 errors

Standard output is empty