Question

Java has default constructor but is not functioning in the same way as C++.

In C++ default constructor is implicitly called when the object is declared so no need to explicit “new” it. But in Java an object must be explicitly initialized. Is there a special reason for that? Was there any feature request for this?

Answer 1

Only if the C++ declaration is creating an object on the stack. All Java objects are heap-based, so that’s not an option. In both languages the constructor is called when a new object is created.

// C++
Obj obj;  // stack
Obj* pObj = new Obj;  // heap

// Java
Obj obj = new Obj();  // heap (stack not possible)