Mindblown: a blog about philosophy.
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What is method overloading?
Method overloading is the polymorphism technique which allows us to create multiple methods with the same name but different signature. We can achieve method overloading in two ways. By Changing the number of arguments By Changing the data type of arguments Method overloading increases the readability of the program. Method overloading is performed to figure…
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Can this keyword be used to refer static members?
Yes, It is possible to use this keyword to refer static members because this is just a reference variable which refers to the current class object. However, as we know that, it is unnecessary to access static variables through objects, therefore, it is not the best practice to use this to refer static members. Consider…
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Can we assign the reference to this variable?
No, this cannot be assigned to any value because it always points to the current class object and this is the final reference in Java. However, if we try to do so, the compiler error will be shown. Consider the following example. Output
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What are the main uses of this keyword?
There are the following uses of this keyword. this can be used to refer to the current class instance variable. this can be used to invoke current class method (implicitly) this() can be used to invoke the current class constructor. this can be passed as an argument in the method call. this can be passed as an argument in the constructor call.…
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What is this keyword in java?
The this keyword is a reference variable that refers to the current object. There are the various uses of this keyword in Java. It can be used to refer to current class properties such as instance methods, variable, constructors, etc. It can also be passed as an argument into the methods or constructors. It can also be…
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Why is the main method static?
Because the object is not required to call the static method. If we make the main method non-static, JVM will have to create its object first and then call main() method which will lead to the extra memory allocation.
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What are the restrictions that are applied to the Java static methods?
Two main restrictions are applied to the static methods. The static method can not use non-static data member or call the non-static method directly. this and super cannot be used in static context as they are non-static.
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What is the static method?
A static method belongs to the class rather than the object. There is no need to create the object to call the static methods. A static method can access and change the value of the static variable.
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What is the static variable?
The static variable is used to refer to the common property of all objects (that is not unique for each object), e.g., The company name of employees, college name of students, etc. Static variable gets memory only once in the class area at the time of class loading. Using a static variable makes your program…
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What is the purpose of a default constructor?
The purpose of the default constructor is to assign the default value to the objects. The java compiler creates a default constructor implicitly if there is no constructor in the class. Output: Explanation: In the above class, you are not creating any constructor, so compiler provides you a default constructor. Here 0 and null values are…
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