generic doubt

[sundar sankar]

Hi All,

/*interface as line1
{
void ge();
}*/
class a1// implements as line 2
{
int a=12;
public void ge()
{
System.out.println("form the class a");
System.out.println(a);
}
}
class a2 extends a1
{
int a=120;
public void ge()
{
System.out.println("form the class b");
System.out.println(a);

}
}
class c <T>// extends a1>
{
T gen;
public c(T va)
{
this.gen=va;
}
public void set()
{
System.out.println(gen+" ," +gen.getClass());
gen.ge();
}
}
class d
{
public static void main(String ava[])
{
a1 ad=new a1();
c<a1> ad1=new c<a1>(ad);
ad1.set();
}
}

iN the above program if i uncomment the line1(interface) and line 2 i got compile time error as method gen.ge() not found in java.object.lang.
please help me in this regard
thanks in advance
sankar

[Keith Lynn]

My guess is that when you uncommented those lines, you forgot to put the bound on the type parameter of c.

This code will compile.

interface myinterface {
   void ge();
}
 
class a1 implements myinterface {
   int a=12;
 
   public void ge() {
      System.out.println("form the class a");
      System.out.println(a);
   }
}
 
class a2 extends a1 {
   int a=120;
 
   public void ge() {
      System.out.println("form the class b");
      System.out.println(a);
   }
}
 
class c<T extends a1> {
   T gen;
 
   public c(T va) {
      this.gen=va;
   }
 
   public void set() {
      System.out.println(gen+" ," +gen.getClass());
      gen.ge();
   }
}
 
class d {
 
   public static void main(String ava[]) {
      a1 ad=new a1();
      c<a1> ad1=new c<a1>(ad);
      ad1.set();
   }
 
}

[ June 26, 2007: Message edited by: Keith Lynn ]

[sundar sankar]

Iam getting compile error with comment in line 1 and line 2
thanks
sankar