JAVA PROGRAMMING

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// 41. replaceFirst()

public class ReplaceFirstExample {
    public static void main(String[] args) {
        String str = "apple orange apple orange";
        String replacedString = str.replaceFirst("apple", "banana");
        System.out.println("String after replacing first occurrence: " + replacedString);
    }
}

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🎉Wish you a very Happy New Year to all Coders ❤️🎊May the New Year bless you with health, wealth, and all the happiness your heart desires.🎊🎊

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// 5. substring()

public class SubstringExample {
    public static void main(String[] args) {
        String str = "Hello, World!";
        String substring = str.substring(7);
        System.out.println("Substring from index 7: " + substring);
    }
}

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// 4. equals()

public class StringEqualityExample {
    public static void main(String[] args) {
        String str1 = "hello";
        String str2 = "HELLO";
        boolean isEqual = str1.equals(str2);
        System.out.println("Are strings equal? " + isEqual);
    }
}

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// 3. toLowerCase()

public class LowerCaseExample {
    public static void main(String[] args) {
        String str = "Hello, World!";
        String lowerCaseString = str.toLowerCase();
        System.out.println("Lowercase string: " + lowerCaseString);
    }
}

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1) Which of the following not a primitive data type?

Anonymous voting

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Java codes for exams

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https://www.techindn.info/2023/12/coding-10.html

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import java.util.Scanner;

"Start"
        Scanner scanner = new Scanner(System.in);

        Pt"Enter an integer: "
        int number = scanner.nextInt();

        Pt"You entered: " + number

        scanner.close();

  "End"

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"public static void main(String arg[])" is written:

Anonymous voting

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// #5 Atithmetic Operations in Java

public class MyClass {
  public static void main(String args[]) {
     
     // declaring variables 
     int add, sub, div, mul, rem;
     
     // 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 
     rem= x%y;     // reminder
     
     // 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 = "+ rem);
  }
}

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Data structures short notes

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//#6 2 Number Adder(Calculator) from user input

// This for Scan anything entered by user (user inputs)
import java.util.Scanner;

class myClass {
    public static void main(String[] args) {
        
        int x,y,Sum;
        
        Scanner s = new Scanner(System.in);
        // it will take input from keyboard
        
        System.out.println("Enter 1st Number: ");
        x = s.nextInt(); // scanning 
        
        System.out.println("Enter 2nd Number: ");
        y = s.nextInt(); // scanning
        
        Sum = x+y;
        System.out.println("Sum = "+ Sum);
    }
}

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// #5 Atithmetic Operations in Java

public class MyClass {
  public static void main(String args[]) {
     
     // declaring variables 
     int add, sub, div, mul, rem;
     
     // 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 
     rem= x%y;     // reminder
     
     // 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 = "+ rem);
  }
}

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//#4 Declaring & iniitializing Array

public class MyClass {
  public static void main(String args[]) {
     
     int arr[]; //declaring array
     arr = new int[20]; // allocating memory
  
     arr[0]= 55; //iniitializing first element
     arr[1]= 33; //initi.... 2nd Element
     System.out.println(arr[0]);
  }
}

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https://www.techindn.info/2023/11/java-what-is-java-language-in-hindi.html