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Feb 24, 2011 · Constructor overriding is not possible because of following reason. Constructor name must be the same name of class name. In Inheritance practice you need to create two classes with different names hence two constructors must have different names. So constructor overriding is not possible and that thought not even make sense.
Dec 11, 2015 · However, each subclass constructor has to chain either to another constructor within the subclass or to a constructor in the superclass. So for example: So for example: public class Superclass { public Superclass(int x) {} public Superclass(String y) {} } public class Subclass extends Superclass { public Subclass() { super(5); // chain to Superclass(int) constructor } }
Feb 1, 2013 · it is not overriding super class constructor and constructor can not be overridden it can be overloaded. When you create child class object super class will be instantiated first then sub class will be instantiated. Its like Child can not be existed without parent. Compiler will automatically call super class constructor from sub class ...
Jan 3, 2014 · You can sort of override the constructor. You cannot actually override one, but you can achieve some of the same results. When you specify a constructor in the child class you can build that however you like. That constructor can then choose which super() constructor gets called. So you can block some child constructors, you can modify the ...
Nov 4, 2008 · In order to achieve constructor chaining, the abstract class will have a constructor. The compiler keeps Super() statement inside the subclass constructor, which will call the superclass constructor. If there were no constructors for abstract classes then java rules are violated and we can't achieve constructor chaining.
Aug 7, 2012 · Even if the no-arg constructor is never used manually, it can be important for other things, e.g. Serializable: During deserialization, the fields of non-serializable classes will be initialized using the public or protected no-arg constructor of the class. A no-arg constructor must be accessible to the subclass that is serializable.
Jun 17, 2014 · why you dont need to override all constructors that defined in Super class. You are not overriding constructor, What you describe isn't overriding. If you don't specify a default constructor, the compiler will create a default constructor, and If it's a subclass, it will call the default parent constructor, super(), in the default constructor.
Dec 12, 2008 · You can have a constructor in the abstract class that accepts the init parameters. The Java spec only specifies that the anonymous class, which is the offspring of the (optionally) abstract class or implementation of an interface, can not have a constructor by her own right. The following is absolutely legal and possible:
3) Instance variables(non static fields) are initialized when a constructor is called. So you can initialize values to you variables inside a constructor. 4) "But i see that you can change the value in the constructor/methods of the class". -- You cannot change it inside a method. 5) A static variable is initialized during class loading.
As per the Java specifications, the instance variables are not overridden from a super class by a sub class when it is extended. Hence the variable in the sub class only can be seen as one sharing the same name. Also when the constructor of A is called during the instance creation of B the variable (intVal) is initialized and hence the output.
