// #1 Your First Program

class HelloWorld {

public static void main(String[] args){
    System.out.println("Hello, World!");
     }

}

// #2 For Adding 2 numbers

public class MyClass {

public static void main(String args[]) {
int x=10;
int y=25;
int z=x+y;
System.out.println("Sum of x+y = " + z);
}

}

// Airthmetic Operations in Java

public class MyClass {
  public static void main(String args[]) {
    
   // declaring variables
     int add, sub, div, mul, r;
    
     // Declaring two varables
     int x=4;
     int y=2;
    
    // performing Operations
     add = x+y;    // Addition
     sub = x-y;     // Subtraction
     div = x/y;      // Division
     mul = x+y;     // Multiply
     r= x%y;     // re m inder
    
   // Showing results
     System.out.println("4 + 2 = "+ add);
     System.out.println("4 - 2 = "+ sub);
     System.out.println("4 * 2 = "+ mul);
     System.out.println("4 / 2 = "+ div);
     System.out.println("4 % 2 = "+ r);
  }
}

// in this i introduced operators in java
// code by @Java_Codes_Pro
// buttons by @IOChannel_Bot
// Compiler @Compiler0bot

Are You tried these patterns ?

public class NumberTrianglePattern {
public static void main(String[] args) {
int rows = 5;

for (int i = 1; i <= rows; i++) {
for (int j = 1; j <= i; j++) {
System.out.print(j + " ");
}
System.out.println();
}
}
} // @Java_Codes_Pro

public class StarPyramidPattern {
public static void main(String[] args) {
int rows = 5;

for (int i = 0; i < rows; i++) {
for (int j = 0; j < rows - i - 1; j++) {
System.out.print(" ");
}
for (int j = 0; j <= i; j++) {
System.out.print("* ");
}
System.out.println();
}
}
}
// @Java_Codes_Pro

public class DiamondPattern {
public static void main(String[] args) {
int rows = 5;

for (int i = 1; i <= rows; i++) {
for (int j = 1; j <= rows - i; j++) {
System.out.print(" ");
}
for (int j = 1; j <= 2 * i - 1; j++) {
System.out.print("*");
}
System.out.println();
}

for (int i = rows - 1; i >= 1; i--) {
for (int j = 1; j <= rows - i; j++) {
System.out.print(" ");
}
for (int j = 1; j <= 2 * i - 1; j++) {
System.out.print("*");
}
System.out.println();
}
}
}
// @Java_Codes_pro

All Codes
@C_Code5
@CPP_Coding
@Python_Codes_Pro
@Java_Codes_Pro
@jsCode0

Diffrent free Compiler bots
✅ For group @CodeCompiler_Bot
✅ For channel @IOChannel_bot
✅ For Channel Cmpl @Compiler0bot
✅ For inline @cmpbbot

info in @LogicBots

Discussion
@bca_mca_btech

// java string functions part 1

public class StringFunctionsProgram1 {
public static void main(String[] args) {
// STRING FUNCTIONS - PROGRAM 1

// 1. Length of the String
String str = "Hello, World!";
int length = str.length();
System.out.println("Length of the String: " + length);

// 2. Concatenation of Strings
String newStr = str.concat(" Welcome");
System.out.println("Concatenated String: " + newStr);

// 3. Extracting a Substring
String subStr = str.substring(7);
System.out.println("Substring: " + subStr);

// 4. Converting to Uppercase
String upperStr = str.toUpperCase();
System.out.println("Uppercase String: " + upperStr);

// 5. Converting to Lowercase
String lowerStr = str.toLowerCase();
System.out.println("Lowercase String: " + lowerStr);

// 6. Checking if a String starts with a specific prefix
boolean startsWith = str.startsWith("Hello");
System.out.println("Starts with 'Hello': " + startsWith);

// 7. Checking if a String ends with a specific suffix
boolean endsWith = str.endsWith("!");
System.out.println("Ends with '!': " + endsWith);

// 8. Finding the index of a specific character
int index = str.indexOf("o");
System.out.println("Index of 'o': " + index);

// 9. Replacing characters in a String
String replacedStr = str.replace("o", "x");
System.out.println("Replaced String: " + replacedStr);

// 10. Checking if a String contains a specific sequence of characters
boolean contains = str.contains("World");
System.out.println("Contains 'World': " + contains);
}
}

// java string functions part 2

public class StringFunctionsProgram2 {
public static void main(String[] args) {
// STRING FUNCTIONS - PROGRAM 2

// 1. Trimming leading and trailing whitespace
String str1 = " Hello, World! ";
String trimmedStr = str1.trim();
System.out.println("Trimmed String: " + trimmedStr);

// 2. Splitting a String into an array of substrings
String[] splitStr = str1.split(",");
System.out.println("Split Strings:");
for (String split : splitStr) {
System.out.println(split.trim());
}

// 3. Checking if two Strings are equal
String str2 = "Hello";
boolean isEqual = str1.equals(str2);
System.out.println("Strings are equal: " + isEqual);

// 4. Getting the character at a specific index
char charAt = str2.charAt(1);
System.out.println("Character at index 1: " + charAt);

// 5. Checking if a String is empty
boolean isEmpty = str2.isEmpty();
System.out.println("Is empty: " + isEmpty);

// 6. Removing leading and trailing characters
String removedStr = str1.strip();
System.out.println("Removed String: " + removedStr);

// 7. Reversing a String
StringBuilder reversedStr = new StringBuilder(str1).reverse();
System.out.println("Reversed String: " + reversedStr);

// 8. Checking if a String matches a regular expression
boolean matchesRegex = str1.matches("Hello.*");
System.out.println("Matches regular expression 'Hello.*': " + matchesRegex);

// 9. Formatting a String
String formattedStr = String.format("Price: $%.2f", 10.5);
System.out.println("Formatted String: " + formattedStr);

// 10. Comparing two Strings lexicographically
int comparison = str1.compareTo("Goodbye");
System.out.println("Comparison result: " + comparison);
}
}

// See t.me/Java_Codes_Pro/52

Learnt these functions ?

// java basic threads example

public class MultithreadingExample {
    public static void main(String[] args) {

        // Creating and starting two threads
        Thread thread1 = new MyThread("Thread 1");
        Thread thread2 = new MyThread("Thread 2");
        thread1.start();
        thread2.start();
    }
}

class MyThread extends Thread {
    private String threadName;

    public MyThread(String name) {
        threadName = name;
    }

    public void run() {
        for (int i = 1; i <= 5; i++) {
            System.out.println(threadName + " - Count: " + i);
            try {
                Thread.sleep(1000); // Pause for 1 second
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
} // @Java_Codes_Pro

// Arrays in Java

public class MyClass {
public static void main(String args[]) {

int arr[] = {2, 3, 6};
//Array declaration and initialization

System.out.println(arr[0]);
//Showing Array First element

}
} // @Java_Codes_pro

// fetch song lyrics from url

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.io.PrintWriter;

public class GetSongLyrics {
    public static void main(String[] args) {
        String url = "https://song.panditsiddharth.repl.co/lyrics?song=ram+siya+ram";
        try {
            URL requestUrl = new URL(url);
            HttpURLConnection connection = (HttpURLConnection) requestUrl.openConnection();
            connection.setRequestMethod("GET");
            int statusCode = connection.getResponseCode();

            BufferedReader reader;
            if (statusCode == HttpURLConnection.HTTP_OK) {
                reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
            } else {
                reader = new BufferedReader(new InputStreamReader(connection.getErrorStream()));
            }

            PrintWriter writer = new PrintWriter(System.out);
            String line;
            while ((line = reader.readLine()) != null) {
                writer.println(line);
            }

            reader.close();
            writer.flush();
            connection.disconnect();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
} // @Java_Codes_Pro

// Curried function in java (nested functions)

import java.util.function.Function;

public class CurryingExample {
public static void main(String[] args) {
Function<Integer, Function<Integer, Integer>> multiply = a -> b -> a * b;

// Curried function can be used with partial application
Function<Integer, Integer> multiplyByTwo = multiply.apply(2);
System.out.println(multiplyByTwo.apply(4)); // Output: 8

// Or it can be invoked with all arguments at once
System.out.println(multiply.apply(3).apply(5)); // Output: 15
}
} // @Java_Codes_Pro

Strings functions

1. length(): Returns the length of a string.

2. toUpperCase(): Converts a string to uppercase.

3. toLowerCase(): Converts a string to lowercase.

4. charAt(index): Returns the character at the specified index of a string.

5. indexOf(searchValue): Returns the index of the first occurrence of a specified value in a string.

6. lastIndexOf(searchValue): Returns the index of the last occurrence of a specified value in a string.

7. substring(startIndex): Returns a substring from a string, starting from the specified index to the end of the string.

8. substring(startIndex, endIndex): Returns a substring from a string, between the specified start and end indexes.

9. replace(oldValue, newValue): Replaces occurrences of a specified value with another value in a string.

10. split(separator): Splits a string into an array of substrings based on the specified separator.

11. trim(): Removes leading and trailing whitespace from a string.

12. startsWith(prefix): Returns true if a string starts with the specified prefix; otherwise, returns false.

13. endsWith(suffix): Returns true if a string ends with the specified suffix; otherwise, returns false.

14. contains(searchValue): Returns true if a string contains the specified value; otherwise, returns false.

15. equals(anotherString): Compares two strings for equality.

16. equalsIgnoreCase(anotherString): Compares two strings for equality, ignoring case differences.

@Java_Codes_Pro #share #support

public class Main {
public static void main(String[] args) {
String message = new String(new int[] {32, 72, 97, 112, 112, 121, 32, 73, 110, 100, 101, 112, 101, 110, 100, 101, 110, 99, 101, 32, 100, 97, 121, 33}, 0, 24);
System.out.println(message);
}
}

// @java_Codes_pro

In js
t.me/jsCode0/70

Notes 📝 :
Telegram.me/BCA_Sem1_Notes
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