remove apache2 from ubuntu
#stop the apache2 service
$ sudo systemctl stop apache2
#remove apache2 packages
$ sudo apt-get purge apache2 apache2-utils apache2-bin apache2.2-common
# cleanup
$ sudo apt-get autoremove
# check if the apache has been removed:
#1- following command line should return a blank line
$ which apache2
# 2- following command line should return apache2: Failed to start apache2.service: Unit apache2.service not found.
$ sudo systemctl start apache2completely uninstall apache from ubuntu
sudo apt-get remove --purge apache2 apache2-data apache2-utilsuninstall apache2 ubuntu
#How to completely remove Apache2 on Ubuntu 20.04 and similar distributions.
#stop the apache2 service
$ sudo systemctl stop apache2
#remove apache2 packages
$ sudo apt-get purge apache2 apache2-utils apache2-bin apache2.2-common
# cleanup
$ sudo apt-get autoremove
# check if the apache has been removed:
#1- following command line should return a blank line
$ which apache2
# 2- following command line should return apache2: Failed to start apache2.service: Unit apache2.service not found.
$ sudo systemctl start apache2
@Oceangreen Technology - We Work For Excellenceclass in java
Class is a blueprint or template which
you can create as many objects as you
like. Object is a member or instance
of a class.
Class is declared using class keyword,
Object is created through
new keyword mainly. A class is a template
for objects. A class defines
object properties including a valid range
of values, and a default value.
A class also describes object behavior.using class in java
class Number {
int number;
// square numbers
public boolean isSquare(){
double squareRoot = Math.sqrt(number);
if(squareRoot == Math.floor(squareRoot))
{
return true;
} else {
return false;
}
}
// triangular numbers
public boolean isTriangular(){
int x = 1;
int triangularNumber = 1;
while(triangularNumber < number){
x++;
triangularNumber = triangularNumber + x;
}
if(triangularNumber == number){
return true;
} else {
return false;
}
}
}
// testing
Number myNumber = new Number();
myNumber.number = 16;
System.out.println(myNumber.isSquare());using class in java
public class HelloWorld {
public static void main(String[] args) {
// how to use class in java
class User{
int score;
// method that can be used outside the class
public boolean hasWon(){
if(score >= 100){
return true;
} else {
return false;
}
}
}
User dave = new User();
dave.score = 20;
System.out.println(dave.hasWon());
}
}Java class syntax
public class Main {
int x = 5;
public static void main(String[] args) {
Main myObj = new Main();
System.out.println(myObj.x);
}
}Java Class
public class Main {
int x = 5;
}how to make a class in java
public class Main {
public static void main (String[] args) {
System.out.println("Hello World");
}
}Copyright © 2021 Codeinu
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