How to clear screen in java

How to Clear Screen in Java

JavaScript Examples » Why Study JavaScript? JavaScript is one of the 3 languages all web developers must learn: 1. to define the content of web pages 2. CSS to specify the layout of web pages 3. JavaScript to program the behavior of web pages This tutorial covers every version of JavaScript: The Original JavaScript ES1 ES2 ES3 (1997-1999)

How to Clear Screen in Java

In Java, when we compile and run Java programs, the console or screen gets messed up with lots of commands and output. To reduce or clear the messing content of the console, we need to clear the screen in Java so that we can execute programs in a proper way. In this section, we will learn how to clear the console or screen in Java.

There are the following ways to clear screen or console in Java:

Using ANSI Escape Code

ANSI escape sequence is standard in-band signaling to control the cursor position. In the following example, we have used the escape code \033[H\033[2J. Let’s break the code and understand it separately.

• \033: It represents the ASCII escape character. Its ANSI value is 27. It stands for ESC .
• [: It represents the escape sequence. It is also known as CSI (Control Sequence Indicator). The CSI command starts with ESC[ followed by zero or more parameters.

On combining the above codes, we get \033[ or ESC[.

• \033[H: It moves the cursor at the top left corner of the screen or console.
• \033[2J: It clears the screen from the cursor to the end of the screen.

Let’s combine the above two codes, we get \033[H\033[2J. The combination of code clears the screen or console.

The CSI commands use the default values if we do not specify any parameter in the command. We can use the following code to clear the screen in java:

ClearScreenExample1.java

public class ClearScreenExample1 < public static void main(String[] args) < System.out.print("\033[H\033[2J"); System.out.flush(); >>

In the above example, we have used the same code (\033[H\033[2J) that we have explained above. It clears the console. We have also used the flush() function that resets the cursor position at the top of the screen.

Using Platform-Specific Command

We can also use the command according to the platform we are using. In this method, first, we get the property of the system by using the getProperty() method of the System class. After that, we select the command used in the platform to clear the console.

System.getProperty() Method

It is the static method of the System class. It is used to get the system property indicated by the specified key. It parses a parameter key of type String. It specifies the name of the system property. It returns the property of the system and

public static String getProperty(String key)

It throws the following exceptions:

• SecurityException: If there exists a security manager and its checkPropertyAccess() method does not allow access to the specified system property.
• NullPointerException: It throws the exception if we do not specify the key null.
• IllegalArgumentException: It throws the exception if the key is empty.

Let’s create a Java program that clears the console using the platform-specific command.

ClearScreenExample2.java

public class ClearScreenExample2 < public final static void clearConsole() < public static void main(String[] args) < try < final String os = System.getProperty("os.name"); if (os.contains("Windows")) < Runtime.getRuntime().exec("cls"); >> catch (final Exception e) < e.printStackTrace(); >>

In the above example, we have specified the Windows operating system and the command that is used to clear the console is cls . We can also use the following code in the above program:

public final static void clearConsole() < try < final String os = System.getProperty("os.name"); if (os.contains("Windows")) < Runtime.getRuntime().exec("cls"); >else < Runtime.getRuntime().exec("clear"); >> catch (final Exception e) < e.printStackTrace(); >>

Using Command Line Interpreter

In this method, we invoke the command line interpreter (CMD). After invoking the interpreter executes the cls command. It allows executing the built-in commands. Now we need to connect the interpreter output channel with the Java process output channel. It can be done by using the inheritIO() method.

ClearScreenExample3.java

import java.io.IOException; public class ClearScreenExample3 < public static void main(String. arg) throws IOException, InterruptedException < new ProcessBuilder("cmd", "/c", "cls").inheritIO().start().waitFor(); >>

Once the above program connects with the console, it starts from a command line without output redirection and clears the screen or console.

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Difference Between JavaScript and JScript

JavaScript and JScript are both scripting languages that come under different trademarks. JavaScript is owned by the oracle corporation while JScript is owned by Microsoft. Both these languages have numerous similarities and dissimilarities. Both JavaScript and JScript came up with the same goal i.e. to develop dynamic and attractive web pages.

The objective of this article is to present a detailed understanding of the below-mentioned concepts:

• What is JavaScript?
• What is JScript?
• Comparison based on Similarities?
• Comparison based on differences?

What is JavaScript?

It is an ECMAScript-based scripting language. It has some additional features other than ECMAScript. JavaScript is most commonly used for web development along with HTML and CSS. So, collectively, JavaScript, HTML, and CSS are used to create interactive web pages.

What is JScript?

It is a scripting language developed by Microsoft and it is very much similar to JavaScript. JScript is popularly used to create dynamic and attractive web pages.

Comparison based on Similarities?

The below-given table will present a comparison between JavaScript and JScript based on similarities:

Metrics	Comparison
Type	Both are scripting languages.
Syntax	Both follow the same syntax.
Performance	Both are fast.
Client/Server	Usually, both are used on the client side.
Objective	Both are designed to make dynamic and interactive web pages.

Comparison based on differences?

The below-given table will present a comparison between JavaScript and JScript based on Differences:

Metrics	JavaScript	JScript
Trademark/Owned By	Oracle Corporation.	Microsoft
Developed in	1995	1996
Based on	ECMAScript	Microsoft’s ECMAScript standard
Compatibility	Compatibility must be maintained on multiple browsers.	Only Microsoft Internet Explorer.
Code Compilation	Code can be compiled in any web browser	Code compiled only in a Microsoft browser.
Content Creation	Doesn’t support active content creation.	Supports active online content for “www”
Object Access	Can’t access browsers objects	Can access objects of MS Internet Explorer.
Execution scope	Can execute in any browser.	Limited to internet explorer only.

That was all the necessary information that is needed to understand before getting started with JavaScript or JScript.

Conclusion

JavaScript and JScript both are scripting languages owned by Oracle Corporation and Microsoft respectively. JavaScript’s code can be compiled in any web browser however, JScript’s code can be compiled only in a Microsoft browser. JavaScript doesn’t support active content creation while JScript

Supports active online content for “www”. JavaScript can’t access the browser’s objects while JScript can access objects of MS Internet Explorer.

This post presented a precise overview of JavaScript and JScript based on their similarities and differences.

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Three Methods to Clear Screen in Java

Anyone who is dedicated to the development of applications and web pages has a basic knowledge of Java, perhaps the most popular programming language in the world. The definition given on its official website is as follows: “Java is a programming language and computing platform that was first released by Sun Microsystems in 1995. It has evolved from humble beginnings to power much of today’s digital world, providing a reliable platform on which to build. they build many services and applications.”

What is Java used for?

Being a multiplatform programming language, Java has been given several uses, among these the following stand out:

• It is used to develop Android applications.
• It is one of the most popular for creating business software.
• There is a wide range of mobile Java applications on the market
• Scientific computing applications
• Use for Big Data analysis
• Java programming of hardware devices
• It is used for server-side technologies like Apache, JBoss, GlassFish, etc.

How to clear the screen in Java

In order to clean the screen in Java, there are three methods that are the most used by expert developers in this language:

1. Using the ANSI escape code
2. Using the platform-specific command
3. Using the command-line interpreter

1. Using the ANSI escape code

This ANSI escape sequence can be defined as standard in-band signaling to control cursor position. In this tutorial, the escape code \033[H\033[2J will be used. Explained separately:

\033: Represents the ASCII escape character. Its ANSI value is 27. It means ESC. [: Represents the escape sequence.

Combining the above codes, we get \033[ or ESC[.

public class ClearScreenExample1 < public static void main(String[] args) < System.out.print("\033[H\033[2J"); System.out.flush(); >>

2. Using the platform-specific command

Another popular method to clean the console in Java is the command offered by the platform we are using. To do this, you first get the system property using getProperty() of the System class. Then the command used on the platform to clear the console is selected.

This method is used to get the system property indicated by the specified key. In syntax it looks like this:

public static String getProperty(String key)

Now let’s create a program to clean up the console in Java using the platform-specific command:

public class ClearScreenExample2 < public final static void clearConsole() < public static void main(String[] args) < try < final String os = System.getProperty("os.name"); if (os.contains("Windows")) < Runtime.getRuntime().exec("cls"); >> catch (final Exception e) < e.printStackTrace(); >>

3. Using the command line interpreter

With this method, the command line interpreter, CMD for its acronym in English, is invoked. After doing this, the interpreter executes the cls command. It can be done using the heritageIO() method.

import java.io.IOException; public class ClearScreenExample3 < public static void main(String. arg) throws IOException, InterruptedException < new ProcessBuilder("cmd", "/c", "cls").inheritIO().start().waitFor(); >>

Thus, with these three simple methods, the developer will be able to clean the console in Java.

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