Subpackages are similar to sub-directories. Consider an example. The company had a com.apple.computers package that contained a Dell.java source file, it would be contained in a series of subdirectories like this −....\com\apple\computers\Dell.javaAt the time of compilation, the compiler creates a different output file for each class, interface, and enumeration defined in it. The base name of the output file is the name of the type, and its extension is .class.For example −// File Name:Dell.java package com.apple.computers; public class Dell { } class Ups { }Now, compile this file as follows using -d option −$javac -d.Dell.javaThe files will be compiled as ... Read More

Subpackages are similar to sub-directories. Consider an example. The company had a com.apple.computers package that contained a Dell.java source file, it would be contained in a series of subdirectories like this −....\com\apple\computers\Dell.javaAt the time of compilation, the compiler creates a different output file for each class, interface, and enumeration defined in it. The base name of the output file is the name of the type, and its extension is .class.For example −// File Name:Dell.java package com.apple.computers; public class Dell { } class Ups { }Now, compile this file as follows using -d option −$javac -d.Dell.javaThe files will be compiled as ... Read More

You can understand it using an example where a Boss class is defined in payroll package.package payroll; public class Boss {    public void payEmployee(Employee e) {       e.mailCheck();    } }if the Employee class is not in the payroll package? The Boss class must then use one of the following techniques for referring to a class in a different package.The fully qualified name of the class can be used. For example −payroll.EmployeeThe package can be imported using the import keyword and the wildcard (*). For example −import payroll.*;The class itself can be imported using the import keyword. ... Read More

You can understand it using an example where a Boss class is defined in payroll package.package payroll; public class Boss {    public void payEmployee(Employee e) {       e.mailCheck();    } }if the Employee class is not in the payroll package? The Boss class must then use one of the following techniques for referring to a class in a different package.The fully qualified name of the class can be used. For example −payroll.EmployeeThe package can be imported using the import keyword and the wildcard (*). For example −import payroll.*;The class itself can be imported using the import keyword. ... Read More

You can understand it using an example where a Boss class is defined in payroll package.package payroll; public class Boss {    public void payEmployee(Employee e) {       e.mailCheck();    } }if the Employee class is not in the payroll package? The Boss class must then use one of the following techniques for referring to a class in a different package.The fully qualified name of the class can be used. For example −payroll.EmployeeThe package can be imported using the import keyword and the wildcard (*). For example −import payroll.*;The class itself can be imported using the import keyword. ... Read More

You can understand it using an example where a Boss class is defined in payroll package.package payroll; public class Boss {    public void payEmployee(Employee e) {       e.mailCheck();    } }if the Employee class is not in the payroll package? The Boss class must then use one of the following techniques for referring to a class in a different package.The fully qualified name of the class can be used. For example −payroll.EmployeeThe package can be imported using the import keyword and the wild card (*). For example −import payroll.*;The class itself can be imported using the import ... Read More

You can understand it using an example where a Boss class is defined in payroll package.package payroll; public class Boss {    public void payEmployee(Employee e) {       e.mailCheck();    } }if the Employee class is not in the payroll package? The Boss class must then use one of the following techniques for referring to a class in a different package.The fully qualified name of the class can be used. For example −payroll.EmployeeThe package can be imported using the import keyword and the wild card (*). For example −import payroll.*;The class itself can be imported using the import ... Read More

You can understand it using an example where a Boss class is defined in payroll package.package payroll; public class Boss {    public void payEmployee(Employee e) {       e.mailCheck();    } }if the Employee class is not in the payroll package? The Boss class must then use one of the following techniques for referring to a class in a different package.The fully qualified name of the class can be used. For example −payroll.EmployeeThe package can be imported using the import keyword and the wild card (*). For example −import payroll.*;The class itself can be imported using the import ... Read More

Let us look at an example that creates a package called animals. It is a good practice to use names of packages with lower case letters to avoid any conflicts with the names of classes and interfaces.Following package example contains interface named animals −/* File name : Animal.java */ package animals; interface Animal {    public void eat();    public void travel(); }Now, let us implement the above interface in the same package animals −package animals; /* File name : MammalInt.java */ public class MammalInt implements Animal {    public void eat() {       System.out.println("Mammal eats");    } ... Read More

Let us look at an example that creates a package called animals. It is a good practice to use names of packages with lower case letters to avoid any conflicts with the names of classes and interfaces.Following package example contains interface named animals −/* File name : Animal.java */ package animals; interface Animal {    public void eat();    public void travel(); }Now, let us implement the above interface in the same package animals −package animals; /* File name : MammalInt.java */ public class MammalInt implements Animal {    public void eat() {       System.out.println("Mammal eats");    } ... Read More