Is it possible to specify both upper and lower bound constraints on type parameters in Java?

Question

Is it possible to specify both upper and lower bound constraints on type parameters in Java?

I found a conversation in Sun\'s forum in which this issue was discussed

Answer 1

you can't specify both at the same time but you can achieve like given code.

class Family {
    F f;

    public void setF(F f) {
        this.f = f;
    }
}

class GrandParent {
}

class Parent extends GrandParent {
}

class Child extends Parent {
}

private  void foo(Family list) {
    list = new Family(); // Allows
    list = new Family(); // Allows
    list = new Family(); // Not Allows

    list.setF(new GrandParent()); // Not Allows
    list.setF(new Parent()); // Not Allows
    list.setF(new Child()); // Not Allows
}

public void bar() {
    foo(new Family()); // Allows
    foo(new Family()); // Allows
    foo(new Family()); // Allows
}