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Why java do not support global variable declaration?
in order to acheive a inheritance and data encapsulation property global variables are not declared in java.
Final classes in java?
A class declared as final means that no other class can inherit from it.
What are Instance variables java?
Instance variableA variable, part of an Object. These might better be called perObject variables since each instantiated object of this class will have its own private copy of this variable. They are allocated when the object is allocated via new. Static methods may not access the instance variables of their class (or any other class for that matter), other that via some object reference, e.g. anObject.someField. Static methods may even access private instance variables in their class via some object reference.
When do you declare a method or class abstract in java?
when overriding of a class or a method is necessary, they can be declared as abstract
what type of variable is visible to every module and the entire program?
If you are talking about a class in Java, a variable encapsulated by a class is called an instance variable b/c everytime you create an object with that class, each object has its own set of the variables declared.
Is it possible to write in static variables in main method in java?
Short answer: No. Only class member variables may be declared static. Local variables with a static declaration will throw an error (usually "illegal start of expression").
What is the difference between class variables and instance variables?
In the case of an instance variable, there is one copy for every instance (object). If you create 10 objects based on a class, there will be 10 copies of the variable. A class variable exists only once for the entire class - no matter how many objects you create - or even if you create no objects based on the class. In Java, such variables (class variables) are declared with the statickeyword.
Are primitive methods and class level variables the same in Java?
No, they are not.
How a class in java declared default?
default it is public type
Why java do not support global variable declaration?
in order to acheive a inheritance and data encapsulation property global variables are not declared in java.
How do you access the static variable and static methods of a class?
In java we access static variables and static methods without creating objects. i.e.,we can access directly by using classname we can also access static variables and static methods by using objects which are created by using class where the static variables and static methods are available
Final classes in java?
A class declared as final means that no other class can inherit from it.
What are Instance variables java?
Instance variableA variable, part of an Object. These might better be called perObject variables since each instantiated object of this class will have its own private copy of this variable. They are allocated when the object is allocated via new. Static methods may not access the instance variables of their class (or any other class for that matter), other that via some object reference, e.g. anObject.someField. Static methods may even access private instance variables in their class via some object reference.
When do you declare a method or class abstract in java?
when overriding of a class or a method is necessary, they can be declared as abstract
what type of variable is visible to every module and the entire program?
If you are talking about a class in Java, a variable encapsulated by a class is called an instance variable b/c everytime you create an object with that class, each object has its own set of the variables declared.
What is meant by a class in java programming?
Class - A class can be defined as a template/ blue print that describe the behaviors/states that object of its type support.Classes in Java:A class is a blue print from which individual objects are created.A sample of a class is given below: public class Dog{ String breed; int age; String color; void barking(){ } void hungry(){ } void sleeping(){ } }A class can contain any of the following variable types.Local variables . variables defined inside methods, constructors or blocks are called local variables. The variable will be declared and initialized within the method and the variable will be destroyed when the method has completed.Instance variables . Instance variables are variables within a class but outside any method. These variables are instantiated when the class is loaded. Instance variables can be accessed from inside any method, constructor or blocks of that particular class.Class variables . Class variables are variables declared with in a class, outside any method, with the static keyword.A class can have any number of methods to access the value of various kind of methods. In the above example, barking(), hungry() and sleeping() are variables.
Are you allowed to declared main method in every class?
Yes. Every Java class can have a main method
What makes up a Java class?
Fields and methods. Fields are variables defined at the class level, i.e., they are available for all methods. Methods are the equivalent of functions / procedures, but they are defined for a specific class.
What is global variable in java?
A local class is declared locally within a block of Java code.You can even have classes declared inside a method. such classes are called local classes.
Name a common Java library class that has public instance variables?
The Math class has public variables - defined as final, of course - for the mathematical constants PI and E.
What are Java enums?
An enum, short for enumerated type, is a variable type that can only take on the values that are declared inside the enum declaration. An enum is declared like a class, except the word "class" is replaced by the word "enum", and the class body is replaced by a list of values that a variable of that type can take on. You can also include methods, instance variables, and constructors in an enum.
How do you prevent inheritance in java?
If a class is declared as final, you can't inherit from it. If individual methods are declared final, then, if the class is inherited, these methods can't be changed in the inherited classes.
Write an expression that computes the sum of two variables in java?
int sum = a + b; PS: a and b are int variables that must have been already declared and initialized.
What happens when no constructor function is declared in a class - in Java?
When any constructor is deffined in your class, the java compiler create a default no argument constructor for you. This constructor only have an invocation to the super class constructor (" super( ) ").
How do you execute a Java program?
You can run a Java application from the command line using "java <name of the class>"
