What is package Why is it useful?
It is a good practice to group related classes implemented by you so that a programmer can easily determine that the classes, interfaces, enumerations, and annotations are related. Since the package creates a new namespace there won’t be any name conflicts with names in other packages.
Are packages required in Java?
You never need to put a class in a package. However, it is almost always a good idea. This is something that Netbeans aggressively tries to encourage you to do. For small projects, using the default package (that is, a file without a package statement) is OK.
How do you define a package in Java?
To create a package, you choose a name for the package (naming conventions are discussed in the next section) and put a package statement with that name at the top of every source file that contains the types (classes, interfaces, enumerations, and annotation types) that you want to include in the package.
What is need of package?
Packages are used in Java in order to prevent naming conflicts, to control access, to make searching/locating and usage of classes, interfaces, enumerations and annotations easier, etc.
What is package example?
Solution 1. A package is an organized collection of classes which is included in the program as per the requirement of the program. For example java.io package is included for input and output operations in a program.
What is the most important feature of Java?
The most significant feature of Java is that it provides platform independence which leads to a facility of portability, which ultimately becomes its biggest strength. Being platform-independent means a program compiled on one machine can be executed on any machine in the world without any change.
What are the advantages and disadvantages of packages in Java?
Advantages and disadvantages of using packages in Java.
- Determination of a category of a file is simplified.
- Name space collision is avoided.
- Access restriction can be applied with the use of packages.
- Java packages can be stored in compressed files called JAR files.
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.
What is the Java lang package?
lang Description. Provides classes that are fundamental to the design of the Java programming language. The most important classes are Object , which is the root of the class hierarchy, and Class , instances of which represent classes at run time.
What is Java util package?
util Package. It contains the collections framework, legacy collection classes, event model, date and time facilities, internationalization, and miscellaneous utility classes (a string tokenizer, a random-number generator, and a bit array). Following are the Important Classes in Java.
What is the importance of classpath in Java?
CLASSPATH: CLASSPATH is an environment variable which is used by Application ClassLoader to locate and load the . class files. The CLASSPATH defines the path, to find third-party and user-defined classes that are not extensions or part of Java platform. Include all the directories which contain .
Why pointers are not used in Java?
So overall Java doesn’t have pointers (in the C/C++ sense) because it doesn’t need them for general purpose OOP programming. Furthermore, adding pointers to Java would undermine security and robustness and make the language more complex.