Can we have multiple public class in java?
Yes, it can. However, there can only be one public top-level class per . java file, and public top-level classes must have the same name as the source file.
Why should there be only one public class in java?
So the reason behind keeping one public class per source file is to actually make the compilation process faster because it enables a more efficient lookup of source and compiled files during linking (import statements).
Are all classes public in java?
Public members are visible to all other classes. This means that any other class can access a public field or method. Further, other classes can modify public fields unless the field is declared as final .
Can a java file have 2 classes?
Yes ! . java file can contain only one public class. If you want these two classes to be public they have to be put into two .
Can I have two public classes?
Long story short: no, you can’t put two public classes in one file because the compiler wouldn’t be able to handle that correctly.
Can constructor be inherited?
Constructors are not members, so they are not inherited by subclasses, but the constructor of the superclass can be invoked from the subclass.
Which is not a Java feature?
2) Which of the following is not a Java features? Explanation: The Java language does not support pointers; some of the major reasons are listed below: One of the major factors of not using pointers in Java is security concerns. Due to pointers, most of the users consider C-language very confusing and complex.
Is overriding possible in Java?
In Java, methods are virtual by default. We can have multilevel method-overriding. Overriding vs Overloading : … Overriding is about same method, same signature but different classes connected through inheritance.
How many classes can you define in a Java package?
There is no limit in the specification, so you can put classes into the package until hitting a technical limitation. If not hitting a limit at the file system or archive format, the runtime implementation likely uses arrays or collections to hold the classes, which limits the number to something close to 2³¹.
What is this keyword in Java?
The this keyword refers to the current object in a method or constructor. The most common use of the this keyword is to eliminate the confusion between class attributes and parameters with the same name (because a class attribute is shadowed by a method or constructor parameter). … Invoke current class constructor.
Is Main a keyword in Java?
main: It is the name of Java main method. It is the identifier that the JVM looks for as the starting point of the java program. It’s not a keyword.
What is private keyword in Java?
The private keyword is an access modifier used for attributes, methods and constructors, making them only accessible within the declared class.
Are classes always public?
By default, the classes visibility is package private, i.e. only visible for classes in the same package. The class has no visibility defined like in Java. They are visible if you included them to the compilation unit.