Optional parameterization using generics in Java

Can I specify a default type when parameterizing a class?

// abstract class    
public abstract class AbsClass<T1 extends Par1Class,T2 extends Par2Class> {
        // code 
    }


// parametrized imlementation class
public class RealClass extends AbsClass<ClassThatExtendsPar1,ClassThatExtendsPar2Class> {
   // code
}

// non-parametrized imlementation class
public class RealClass extends AbsClass {
   // code
}

In my implementation, I must specify the none or all parameter It is possible to make the second parameter not mandatory, such as:

// abstract class    
public abstract class AbsClass<T1 extends Par1Class,T2 extends Par2Class : default Par2Class > {
        // code 
    }

// parametrized only mandatory imlementation class
public class RealClass extends AbsClass<ClassThatExtendsPar1> {
   // code
}

Solution

The simple answer: No, Java does not support such default parameters