constructor. We should declare constructor as private for not to allow user to create object from outside of our class. Basically we will declare private constructor in Singleton design pattern. 10.Is Constructor definition is mandatory in class? No, it is optional . If we do not define a c...
Answer: Constructor can be explained in detail with enlisted points: When a new object is created in a program a constructor gets invoked corresponding to the class. The constructor is a method which has the same name as the class name. If a user doesn’t create a constructor implicitly a ...
74) Whether constructor has any returnvalue? Constructors return no value, not even`void`. 75) Is constructor inherited? In Java,constructors are not inherited. 76)Is it possible to make a constructor final? Constructors cannot be declared `final`. 77) Java static methods in the canbe rest...
3) What are constructors in Java? In Java, the constructor is a block of code that is used to initialize an object. 4) What are the types of constructors? There are two types of constructors: - Default, constructor - Parameterized constructor 5) Explain garbage collection in Java In Jav...
String getMessage()- This method returns the message String of Throwable and the message can be provided while creating the exception through its constructor. String getLocalizedMessage()- This method is provided so that subclasses can override it to provide the locale-specific messages to the callin...
9. Differentiate between the constructors and methods in Java? 10. What is final keyword in Java? “final” is a special keyword in Java that is used as a non-access modifier. A final variable can be used in different contexts such as: ...
[7]Java default constructorhttps://stackoverflow.com/questions/4488716/java-default-constructor [8]Why do we need a default no argument constructor in Java?https://stackoverflow.com/questions/3078389/why-do-we-need-a-default-no-argument-constructor-in-java ...
//constructorpublicPoint(intx,inty){this.x=x;this.y=y;} Copy We can also use this keyword to invoke other constructors from a constructor. publicRectangle(){this(0,0,0,0);}publicRectangle(intwidth,intheight){this(0,0,width,height);}publicRectangle(intx,inty,intwidth,intheight){this....
We can construct a tree set with the constructor by using comparable (or) comparator.Example:public class Fruits{ public static void main (String[] args) { Treeset<String> names= new TreeSet<String>(); names.add(“cherry”); names.add(“banana”); names.add(“apple”); names.add(“...
However, in a more realistic situation, myRect might be initialized to null in one place, say in a constructor, and used later. In that case, the program will compile just fine, but will generate a NullPointerException at runtime. Question: The following code creates one array and one ...