Single Level inheritance - A class inherits properties from a single class. For example, Class B inherits Class A.Example Live Democlass Shape {    public void display() {       System.out.println("Inside display");    } } class Rectangle extends Shape {    public void area() {       System.out.println("Inside area");    } } public class Tester {    public static void main(String[] arguments) {       Rectangle rect = new Rectangle();       rect.display();       rect.area();    } }OutputInside display Inside areaHere Rectangle class inherits Shape class and can execute two methods, display() and area() as shown.

Single Level inheritance - A class inherits properties from a single class. For example, Class B inherits Class A.Example Live Democlass Shape {    public void display() {       System.out.println("Inside display");    } } class Rectangle extends Shape {    public void area() {       System.out.println("Inside area");    } } public class Tester {    public static void main(String[] arguments) {       Rectangle rect = new Rectangle();       rect.display();       rect.area();    } }OutputInside display Inside areaHere Rectangle class inherits Shape class and can execute two methods, display() and area() as shown.

Single Level inheritance - A class inherits properties from a single class. For example, Class B inherits Class A.Example Live Democlass Shape {    public void display() {       System.out.println("Inside display");    } } class Rectangle extends Shape {    public void area() {       System.out.println("Inside area");    } } public class Tester {    public static void main(String[] arguments) {       Rectangle rect = new Rectangle();       rect.display();       rect.area();    } }OutputInside display Inside areaHere Rectangle class inherits Shape class and can execute two methods, display() and area() as shown.

Yes. The only condition is to have one public class in separate java file.

Yes. The only condition is to have one public class in separate java file.

Yes. The only condition is to have one public class in separate java file.

Using CLASSPATH, you can load any classes at runtime.Like the .java source files, the compiled .class files should be in a series of directories that reflect the package name. However, the path to the .class files does not have to be the same as the path to the .java source files. You can arrange your source and class directories separately, as −\sources\com\apple\computers\Dell.java \classes\com\apple\computers\Dell.classBy doing this, it is possible to give access to the classes directory to other programmers without revealing your sources. You also need to manage source and class files in this manner so that the compiler and the ... Read More

Using CLASSPATH, you can load any classes at runtime.Like the .java source files, the compiled .class files should be in a series of directories that reflect the package name. However, the path to the .class files does not have to be the same as the path to the .java source files. You can arrange your source and class directories separately, as −\sources\com\apple\computers\Dell.java \classes\com\apple\computers\Dell.classBy doing this, it is possible to give access to the classes directory to other programmers without revealing your sources. You also need to manage source and class files in this manner so that the compiler and the ... Read More

Using CLASSPATH, you can load any classes at runtime.Like the .java source files, the compiled .class files should be in a series of directories that reflect the package name. However, the path to the .class files does not have to be the same as the path to the .java source files. You can arrange your source and class directories separately, as −\sources\com\apple\computers\Dell.java \classes\com\apple\computers\Dell.classBy doing this, it is possible to give access to the classes directory to other programmers without revealing your sources. You also need to manage source and class files in this manner so that the compiler and the ... 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