Compiler generated constractor code

class Foo {}

======>

class Foo {
    Foo() {
        super();
    }
}

---

class Foo {
    Foo() {}
}

======>

class Foo {
    Foo() {
        super();
    }
}

---

public class Foo {}

======>

public class Foo {
    public Foo() {
        super();
    }
}

---

class Foo {
    Foo(String s) {}
}

======>

class Foo {
    Foo(String s) {
        super();
    }
}

---

class Foo {
    Foo(String s) {
        super();
    }
}

======>

Nothing, compiler doesn't need to insert anything.

---

class Foo {
    void Foo() {}
}

======>

class Foo {
    void Foo() {}
    Foo() {
        super();
    }
}

(void Foo() is a method, not a constructor.)


Refrence: SCJP Sun® Certified Programmer for Java™ 6 Study Guide Exam (310-065)