Java Codes Basic to Advance

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Solution: import java.util.Scanner; public class Pattern { public static void main(String[] args) { Scanner scan = new Scanner(System.in); System.out.println("Enter the value of n: "); int n = scan.nextInt(); for (int i = 1 ; i <= n; i++) { for (int j = 1; j <= n - i; j++) { System.out.print("1 "); } for(int k = 1; k <= i; k++){ System.out.print(i + " "); } System.out.println(); } } }

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Explanation: str = str.replaceAll("\\s", "") : This line replaces all whitespace characters in the string str with an empty string, effectively removing them. The \\s is a regular expression pattern that matches any whitespace character, such as spaces, tabs, or newlines. The double backslash \\ is necessary because \ is an escape character in Java strings, so to represent a single backslash in a regular expression, you need to escape it with another backslash.

#TaskAnswer public class TaskAnswer { public static void main(String[] args) { String str = "I am learning Java object oriented programming"; str = str.replaceAll("\\s", ""); System.out.println(str); } } Output: Iamlearningobjectorientedprogramming

Write code on task's comment, which code will be best that code should be posted here with those name After 8pm today

#Taskforyou Write a Java program that remove the extra spaces from the following string: ' I am learning Java object oriented programming '

Java all Codes listed see pin message 👆 Or you can search any keyword Example: "function" to see function related codes

Create compiler bot in mobile Run any language codes In hindi: Ab laptop ko kar do Tata bye bye gya 😂 https://youtu.be/352o8B9IikI?si=OSrhBU0mcFEkqILA

Remaining Topics like Inheritance, Polymorphism, Hash Map, Wrapper Classes, Regex, Threads, Lamda will be added soon

Output: Deleted the file: test.txt Failed to delete the folder. Output of 14 Syntax:File Delete and folder

//14 Syntax:File Delete and folder

import java.io.File;

public class DeleteFile {
  public static void main(String[] args) {
  try{
     File DObj = new File("Location Of File");
     if (DObj.delete()) {
    System.out.println("Deleted the file: " + DObj.getName());
  } else {
    System.out.println("Failed to delete the file.");
  }
    }catch(Exception e){
        System.out.println("Failed to delete the folder.");
    }
    finally{
        File DFObj = new File("Location of Folder");
  if (DFObj.delete()) {
    System.out.println("Deleted the folder: " + DFObj.getName());
  } else {
    System.out.println("Failed to delete the folder.");
  }
    }
  }
}
//Note This code can only run in Your PC

Output: File name: test.txt Absolute path: /home/runner/compilers/./test/test.txt Writeable: true Readable true File size in bytes 18 What am I writting Output of 14 Syntax:File Read / Info

//14 Syntax:File Read / Info

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;

public class ReadFile {
  public static void main(String[] args) {
    File Obj = new File("Location of text File");
        if (Obj.exists()) {
        System.out.println("File name: " + Obj.getName());
        System.out.println("Absolute path: " + Obj.getAbsolutePath());
        System.out.println("Writeable: " + Obj.canWrite());
        System.out.println("Readable " + Obj.canRead());
        System.out.println("File size in bytes " + Obj.length());
       }
        else {
        System.out.println("The file does not exist.");
       }
  try {
        File ObjR = new File("Location of text file");
        Scanner MReader = new Scanner(ObjR);
        while (MReader.hasNextLine()) {
        String data = MReader.nextLine();
          System.out.println(data);
        }
    MReader.close();
    }catch (FileNotFoundException e) {
    System.out.println("An error occurred.");
    e.printStackTrace();
  }
  }
 }
//Note This code can only run in Your PC

Output: File created: test.txt Successfully wrote to the file Output of 14 Syntax:File Create / write

//14 Syntax:File Create / write

import java.io.File;
import java.io.FileWriter;
import java.io.IOException;

public class CreateFile {
  public static void main(String[] args) {
  try {
    File Obj = new File("Give Location where to create File");
    if (Obj.createNewFile()) {
      System.out.println("File created: " + Obj.getName());
    FileWriter MWriter = new FileWriter("give Location of file which to write");
    MWriter.write("What am I writting");
    MWriter.close();
     System.out.println("Successfully wrote to the file.");
    } else {
      System.out.println("File already exists.");
    }
  } catch (IOException e) {
    System.out.println("An error occurred.");
    e.printStackTrace();
  }
  }
}
//Note This code can only run in Your PC

Exception in thread "main" java.lang.ArithmeticException: Access denied at Main.main(Main.java:3) Output of 13 Syntax:Exception handling 03