0
What else can I help you with?
What are differences between user defined packages and predefined packages in java?
As we know, default package of java.lang.*; is implicitly called if it is not explicitly called Ok, So. Package is Collection Classes ( abstract or interfaces).Package Creation :-1 ) First line of the program, in which you want create a package must be a your desired package name starting with package keyword and followed by semicolon.2 ) While creating package, it is not necessary to write public before each class name.3 ) But, each and ever method must be public.Creating or Compiling Package :-Syntax :-D:\Practice\Javac -d < Path of program > < .java file name >Complete Example :-package TYBCS;class Mathematics{public int addNumbers(int num1,int num2){return(num1+num2);}public static double addFloatNum(double num1,double num2,double num3){return(num1+num2+num3);}}class Maximum{public int getMaxOutofThree(int n1,int n2,int n3){int num=0;if(n1>n2 && n1>n3) { num=n1; }if(n2>n1 && n2>n3) { num=n2; }if(n3>n1 && n3>n2) { num=n3; }return num;}}class Practice{public static void main(String args[]){Mathematics m=new Mathematics();Maximum mx=new Maximum();System.out.println("Addition 5+5 : "+m.addNumbers(5,5));System.out.println("Addition f 2.5+2.5 : "+m.addFloatNum(2.5,2.5,2.5));System.out.println("Max Number 7, 8 , 1 : "+mx.getMaxOutofThree(7,8,1));}}/*Output:-D:\Data>javac -d D:\Data\ Practice.javaD:\Data>java TYBCS.PracticeAddition 5+5 : 10Addition 2.5+2.5 : 7.5Max Number 7, 8 , 1 : 8D:\Data>*/
What does import java.awt.event mean?
The statement import java.awt.event is a Java import statement that allows a program to use classes and interfaces from the java.awt.event package, which contains classes for handling event-driven programming, such as user interactions with GUI components. This package includes event listener interfaces and event classes for various types of events, such as mouse clicks, key presses, and window actions. By importing this package, developers can easily implement event handling in their Java applications.
What is the need of package in java?
Packages are containers-for-classes used to keep the class namespace compartmentalized.Using Package,1. We can define classes inside a package that are notaccessible by the code outside that package.2. We can define class members that are only accessible by code inside that package.3. We can have a class stored in a package withoutconcern that it will collide with some other class (havin same name), stored else where.Package is basically a collection of predefined or ready-made classes that can be used in your java program to make shorter as well as easier. Package- import java.lang.*; is always implicitly called when you write a java program.
What are the different types of package in java?
1.user defined packages 2.predefined packages
What is meant by pedefined types?
Predefined types are the primitives that are included in Java, such as char and int. They are already defined by the language, and so do not need to be developed by a developer or included from any package. There are also predefined classes, which do need to be imported, but are again part of the language specification so the developer does not need to reinvent the wheel each time they start a new project.
How can you design package in java?
it's a collection of classes is called a package .its a collection classes and interfaces which provides high level of security
How do you see all predefined classes in a package?
You'll typically want to look at the JavaDocs for that package. If the code is undocumented and all you have is source code, you'll need to look through the folder for that package.
What is the package and interfaces?
Package:- package is collection of related classes and interfaces which can be import in our program. There are different built in packages available in java.Package provide us a facility to create user define packages. Interfaces:- Interface is just like abstract class but the difference is that we can implements any no of interfaces in a single class .It is an alternative solution for multiple inheritance which is not available in java. Once we have implement the interface we can define methods of that interface in our class.
What are differences between user defined packages and predefined packages in java?
As we know, default package of java.lang.*; is implicitly called if it is not explicitly called Ok, So. Package is Collection Classes ( abstract or interfaces).Package Creation :-1 ) First line of the program, in which you want create a package must be a your desired package name starting with package keyword and followed by semicolon.2 ) While creating package, it is not necessary to write public before each class name.3 ) But, each and ever method must be public.Creating or Compiling Package :-Syntax :-D:\Practice\Javac -d < Path of program > < .java file name >Complete Example :-package TYBCS;class Mathematics{public int addNumbers(int num1,int num2){return(num1+num2);}public static double addFloatNum(double num1,double num2,double num3){return(num1+num2+num3);}}class Maximum{public int getMaxOutofThree(int n1,int n2,int n3){int num=0;if(n1>n2 && n1>n3) { num=n1; }if(n2>n1 && n2>n3) { num=n2; }if(n3>n1 && n3>n2) { num=n3; }return num;}}class Practice{public static void main(String args[]){Mathematics m=new Mathematics();Maximum mx=new Maximum();System.out.println("Addition 5+5 : "+m.addNumbers(5,5));System.out.println("Addition f 2.5+2.5 : "+m.addFloatNum(2.5,2.5,2.5));System.out.println("Max Number 7, 8 , 1 : "+mx.getMaxOutofThree(7,8,1));}}/*Output:-D:\Data>javac -d D:\Data\ Practice.javaD:\Data>java TYBCS.PracticeAddition 5+5 : 10Addition 2.5+2.5 : 7.5Max Number 7, 8 , 1 : 8D:\Data>*/
What does import java.awt.event mean?
The statement import java.awt.event is a Java import statement that allows a program to use classes and interfaces from the java.awt.event package, which contains classes for handling event-driven programming, such as user interactions with GUI components. This package includes event listener interfaces and event classes for various types of events, such as mouse clicks, key presses, and window actions. By importing this package, developers can easily implement event handling in their Java applications.
What are the packages used in java?
package is a logical container that contains logically related classes interfaces and sub packages. Concept of package is use to provide a unik name space to class as well as to enforce scope.
List out the predefined classes in PHP?
Classes are not like predefined functions-there are quite a lot of functions, a class is similar to creating your own function - on a very basic level please do not swamp me with lists of the differences between a class and a function I already know! - anyway, anything predefined within php will be available to view in the PHP manual - downloadable from the php website and is part of the php package. but to save you a bit of time here are a list of pre-defined classes (or rather resevered words that are classes): http://php.net/manual/en/reserved.classes.php
What is the need of package in java?
Packages are containers-for-classes used to keep the class namespace compartmentalized.Using Package,1. We can define classes inside a package that are notaccessible by the code outside that package.2. We can define class members that are only accessible by code inside that package.3. We can have a class stored in a package withoutconcern that it will collide with some other class (havin same name), stored else where.Package is basically a collection of predefined or ready-made classes that can be used in your java program to make shorter as well as easier. Package- import java.lang.*; is always implicitly called when you write a java program.
What servlet API used for database connection?
The Servlet 2.3 API consists of two packages: javax.servlet and javax.servlet.http. The base functionality is defined in the javax.servlet package whose classes and interfaces outline a generic, protocol-independent implementation. This means you can use it for non-Web applications, too. The javax.servlet.http interface defines classes and interfaces that are specific to the Hypertext Transfer Protocol (HTTP).
What are the different types of package in java?
1.user defined packages 2.predefined packages
What is meant by pedefined types?
Predefined types are the primitives that are included in Java, such as char and int. They are already defined by the language, and so do not need to be developed by a developer or included from any package. There are also predefined classes, which do need to be imported, but are again part of the language specification so the developer does not need to reinvent the wheel each time they start a new project.
Can you store one class in two packages at once in Java?
No, each class is assigned to a single package. There is really no need to have one class in more than one package, either; you can use the "import" command in one class to use classes from another package.
