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How to Turn Off Game Achievement Notifications on Xbox Series X|S

When you hit certain gaming milestones on the Xbox Series X|S, you’ll see achievement labels on the screen. If you find these notifications distracting, you can turn them off. By default, Xbox achievements appear in the center of the lower half of the screen, right on top of subtitles or the heads-up display in various games. There are two ways to solve this problem: Turn off notifications completely or change the position of game achievement alerts.

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Java Wrapper Classes

Java Wrapper Classes
  • Wrapper classes provide a way to use primitive data types (int, boolean, etc..) as objects.
  • The table below shows the primitive type and the equivalent wrapper class:
Primitive Data Type Wrapper Class
byte Byte
short Short
int Integer
long Long
float Float
double Double
boolean Boolean
char Character

 

Sometimes you must use wrapper classes, for example when working with Collection objects, such as ArrayList, where primitive types cannot be used (the list can only store objects):

Example
ArrayList<int> myNumbers = new ArrayList<int>(); // Invalid

ArrayList<Integer> myNumbers = new ArrayList<Integer>(); // Valid
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Java Regular Expressions

What is a Regular Expression?
  • A regular expression is a sequence of characters that forms a search pattern. When you search for data in a text, you can use this search pattern to describe what you are searching for.
  • A regular expression can be a single character, or a more complicated pattern.
  • Regular expressions can be used to perform all types of text search and text replace operations.
  • Java does not have a built-in Regular Expression class, but we can import the java.util.regex package to work with regular expressions. The package includes the following classes:
  • Pattern Class – Defines a pattern (to be used in a search)
  • Matcher Class – Used to search for the pattern
  • PatternSyntaxException Class – Indicates syntax error in a regular expression pattern
Example

Find out if there are any occurrences of the word “w3schools” in a sentence:

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main {
  public static void main(String[] args) {
    Pattern pattern = Pattern.compile("w3schools", Pattern.CASE_INSENSITIVE);
    Matcher matcher = pattern.matcher("Visit W3Schools!");
    boolean matchFound = matcher.find();
    if(matchFound) {
      System.out.println("Match found");
    } else {
      System.out.println("Match not found");
    }
  }
}
// Outputs Match found
Example Explained

In this example, The word “w3schools” is being searched for in a sentence.

First, the pattern is created using the Pattern.compile() method. The first parameter indicates which pattern is being searched for and the second parameter has a flag to indicates that the search should be case-insensitive. The second parameter is optional.

The matcher() method is used to search for the pattern in a string. It returns a Matcher object which contains information about the search that was performed.

The find() method returns true if the pattern was found in the string and false if it was not found.

Flags

Flags in the compile() method change how the search is performed. Here are a few of them:

  • Pattern.CASE_INSENSITIVE – The case of letters will be ignored when performing a search.
  • Pattern.LITERAL – Special characters in the pattern will not have any special meaning and will be treated as ordinary characters when performing a search.
  • Pattern.UNICODE_CASE – Use it together with the CASE_INSENSITIVE flag to also ignore the case of letters outside of the English alphabet
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