Method overloading and method overriding are both concepts in object-oriented, specifically in the context of class and method definitions.

Method Overloading:

• Method overloading occurs when a class has multiple methods with the same name but different parameters.
• These methods can have different numbers or types of parameters.
• The compiler determines which method to call based on the number and types of arguments passed to it.
• Method overloading enables the creation of multiple methods with the same name but different behaviors based on the parameters provided.

Example of method overloading:

class OverloadExample {
    public void display(int n) {
        System.out.println("Displaying integer: " + n);
    }

    public void display(String s) {
        System.out.println("Displaying string: " + s);
    }
}

Overriding:

• Method overriding occurs when a subclass provides a specific implementation of a method that is already by its parent class.
• The method in the subclass has the same name, return type, and parameters as the method in the parent class.
• The purpose of method overriding is to provide a specific implementation of the in the subclass that is different from the implementation in the parent.
• When the overridden method is called by a reference of the parent class, the subclass method is executed.

Example of method overriding:

class Animal {
    public void makeSound() {
        System.out.println("Animal makes a sound");
    }
}

class Dog extends Animal {
    @Override
    public void makeSound() {
        System.out("Dog barks");
    }
}

In summary, method overloading is about having multiple methods with the same name but different parameters within the same class, while method overriding is about providing a specific implementation of a method in a subclass that is already defined in its parent class.

Certainly! Here are a few commonly asked string-related interview questions in Java along with sample solutions:

1. Reverse a String: Question: Write a Java program to reverse a given string.

   public class StringReverse {
       public static void main(String[] args) {
           String str = "Hello";
           String reversed = new StringBuilder(str).reverse().toString();
           System.out.println("Original: " + str);
           System.out.println("Reversed: " + reversed);
       }
   }

2. Count the Occurrences of a Character in a String: Question: Write a Java program to count the occurrences of a specific character in a string.

   public class CharOccurrence {
       public static void main(String[] args) {
           String str = "Hello, world!";
           char searchChar = 'o';
           long count = str.chars().filter(ch -> ch == searchChar).count();
           System.out.println("Occurrences of '" + searchChar + "': " + count);
       }
   }

3. Remove White Spaces from a String: Question: Write a Java program to remove all white spaces from a given string.

   public class RemoveWhiteSpace {
       public static void main(String[] args) {
           String str = "  Hello,   World!  ";
           String trimmed = str.replaceAll("\\s", "");
           System.out.println("Original: " + str);
           System.out.println("Without Whitespaces: " + trimmed);
       }
   }

4. Check for Anagrams: Question: Write a Java program to check if two strings are anagrams of each other.

   import java.util.Arrays;
   
   public class AnagramCheck {
       public static void main(String[] args) {
           String str1 = "listen";
           String str2 = "silent";
           boolean isAnagram = isAnagram(str1, str2);
           System.out.println(str1 + " and " + str2 + " are anagrams: " + isAnagram);
       }
   
       public static boolean isAnagram(String str1, String str2) {
           char[] charArray1 = str1.toCharArray();
           char[] charArray2 = str2.toCharArray();
           Arrays.sort(charArray1);
           Arrays.sort(charArray2);
           return Arrays.equals(charArray1, charArray2);
       }
   }

These are just a few examples of Java string-related interview programs, and there are many more possibilities to explore within this domain.

Certainly! Here are 20 Java string-related interview questions with sample solutions:

1. Write a program to find the length of a string.
2. Write a program to concatenate two strings in Java.
3. Write a program to convert all characters in a string to uppercase.
4. Write a program to check if a string is a palindrome.
5. Write a program to count the number of vowels and consonants in a string.
6. Write a program to check if a string contains only digits.
7. Write a program to find the first non-repeating character in a string.
8. Write a program to find the duplicate characters in a string.
9. Write a program to print all permutations of a given string.
10. Write a program to reverse words in a given string.
11. Write a program to remove a specific character from a string.
12. Write a program to find the first occurrence of a character in a string.
13. Write a program to compare two strings in Java.
14. Write a program to check if a string is an anagram of another string.
15. Write a program to count the occurrences of a specific word in a string.
16. Write a program to split a string based on a specific delimiter.
17. Write a program to check if a string contains a specific substring.
18. Write a program to convert a string to integer in Java.
19. Write a program to check if a string is a rotation of another string.
20. Write a program to remove all white spaces from a given string.

For each of these questions, multiple different solutions might be possible based on different algorithms and approaches. If you have any specific question you'd like to see a sample solution for, feel free to ask!

Certainly! Here are the questions along with sample solutions for each:

1. Write a program to find the length of a string.

   public class StringLength {
       public static void main(String[] args) {
           String str = "Hello, World!";
           int length = str.length();
           System.out.println("Length of the string is: " + length       }
   }

2. Write a program to concatenate two strings in Java.

   public class StringConcatenation {
       public static void main(String[] args) {
           String str1 = "Hello";
           str2 = "World";
           String concatenated = str1.concat(str2);
           System.out.println("Concatenated String: " + concatenated);
       }
   }

3. Write a program to convert all characters in a string to uppercase.

   public class UppercaseConversion {
       public void main(String[] args) {
           String str = "hello, world!";

String upperCase = str.toUpperCase(); System.out.println("Uppercase String: " + upperCase); } }

4. a program to check if a string is a palindrome.

java
public class PalindromeCheck {
    public static void main(String[] args) {
        String str = "madam";
        String reversed = new StringBuilder(str).reverse().();
        boolean isPalindrome = str.equals(reversed);
        System.out.println("Is palindrome: " + isPalindrome);
    }
}

5. Write a program to count the number of vowels and consonants in a string.

   public class VowelConsonantCount {
       public static void main(String[] args) {
           String str = "Hello, World!";
           int vowels = 0, consonants = 0;
           str str.toLowerCase();
           for (int i = 0; i < str.length(); i++) {
               char ch = str.charAt(i);
               if (ch == 'a' || ch == 'e' || ch == 'i' || ch 'o' || ch == 'u') {
                   vowels++;
               } else if ((ch >= 'a' && <= 'z')) {
                   consonants++;
               }
           }
           System.out.println("Vowel count: " + vowels);
           System.out.println("Consonant count: " + consonants);
       }
   }

These are the first five questions with their sample solutions. Let me know if you need more questions and answers!  

Certainly! Here are the code solutions for the provided questions:

1. Write a program to find the length of a string.

java public class StringLength { public static void main(String[] args) { String str = "Hello, World!"; int length = str.length(); System.out.println("Length of the string is: " + length); } }

2. Write a program to two strings in Java.

```java
public class StringConcatenation {
    public static void main(String[] args) {
        String str1 = "Hello";
        String2 = "World";
        String concatenated = str1 + str2;
        System.out.println("Concatenated String: " + concatenated);
    }
  ```

3. Write a program to convert all characters in a string to uppercase.

```java
public class UppercaseConversion {
    public static void main(String[] args) {
        String str = "hello, world!";
        String upperCase = str.toUpperCase();
        System.out.println("Uppercase String: " + upperCase);
    }
}

4. Write a program to check if string is a palindrome.

   public class PalindromeCheck {
       public static void main(String[] args) {
           String str = "madam";
           String reversed = new StringBuilder(str).reverse().toString();
           boolean isPalindrome = str.equals(reversed);
           System.out.println("Is palindrome: " + isPalindrome);
       }
   }

5. Write program to count the number of vowels and consonants in a string.

   class VowelConsonantCount {
       public static void(String[] args) {
           String str = "Hello, World!";
           int vowels = 0 consonants = 0;
           str = str.toLowerCase();

for (int i = 0; i < str.length(); i++) { char ch = str.charAt(i); if (ch == 'a' || ch == 'e' || ch ==i' || ch == 'o' || ch == 'u') { vowels++; } else if ((ch >= 'a' && ch 'z')) { consonants++; } } System.out.println("Vowel count: " + vowels); System.out.println("Consonant count: " + consonants); } } `

This is the first set of questions with their corresponding program solutions. If you need more, feel free to ask!

Certainly! Here are the solutions for the remaining questions:

6. Write a program to check if a string contains only digits.

public class OnlyDigitsCheck {
    public static void main(String[] args) {
        String str = "12345";
        boolean containsOnlyDigits = str.matches("[0-9]+");
        System.out.println("Contains only digits: " + containsOnlyDigits);
    }
}

7. Write a program to find first non-repeating character in a string.

public class FirstNonRepeatingChar {
    public static void main(String[] args) {
        String str = "hello";
        char nonRepeating = 0;
        for (int i = 0; i str.length(); i++) {
            char currentChar = str.charAt(i);
            if (str.indexOf(currentChar) == str.lastIndexOf(currentChar)) {
                nonRepeating = currentChar;
                break;
            }
        }
 System.out.println("First non-repeating character: " + nonRepeating);
    }
}

. Write a program to find the duplicate characters in a string```java public class DuplicateCharacters { public static void main(String[] args) { String str = "programming"; Set characters = new HashSet<>(); Set duplicates = new HashSet<>(); for (char ch : str()) { if (!characters.add(ch)) { duplicates.add(ch); } } System.out.println("Duplicate characters: + duplicates); } }

9. Write a program print all permutations of a given string.

```java
public class StringPermutations {
    public static void main(String[] args) {
        String str = "abc";
        permutation("", str);
    }

    private static void permutation(String prefix, String str) {
        int n = str.length();
        if (n == 0) {
            System.out.println(prefix);
        } else {
            for (int i = ; i < n; i++) {
                permutation(prefix +.charAt(i), str.substring(0, i) + str.substring(i + 1, n));
            }
        }
    }
}

10. Write program to reverse words in a given string.

 class ReverseWords {
    public static void main(String[] args) {
        String str = "Hello World";
        String[] words = str.split(" ");
        StringBuilder reversedString = new StringBuilder();
        for (int i = words.length - 1; i >= 0; i--) {
            reversedString.append(words[i]).append(" ");
        }
        System.out.println("Reversed string: " + reversedString.toString().trim());
    }
}

These are the solutions for the remaining questions. Let me know if there's anything else you'd like to!

Certainly! Here are the solutions for the remaining questions:

11. Write a program to remove a specific character from a string.

public RemoveSpecificChar {
    public static void main(String[] args) {
        String str = "Hello, World!";
        char charToRemove = 'o';
        String newStr = str.replace(String.valueOf(charToRemove), "");
        System.out.println("Original string: " + str);
        System.out.println("String after removal: " + newStr);
    }
}

12. Write a program to find the first occurrence of character in a string.

public class FirstOccurrence {
    public static void main(String[] args) {
        String str = "Hello, World!";
        char searchChar = 'o';
        int firstIndex = str.indexOf(searchChar);
        System.out.println("First occurrence of '" + searchChar + "': " + firstIndex);
    }
}

. Write a program to compare two strings in Java.

public class StringComparison {
    public static void main(String[] args) {
        String str1 = "Hello";
        String str = "hello";
        boolean areEqual = str1.equals(str2);
        System.out.println("Strings equal: " + areEqual);
    }
}

14. Write a program to check if a string is an anagram of another string.

import java.util.Arrays;

public class AnagramCheck {
    public static void main(String[] args) {
        String str1 = "listen";
        String str2 =silent";
        boolean isAnagram = isAnagram(str1, str2);
       .out.println(str1 + " and " + str2 + " are anagrams: " + isagram);
    }

    public static boolean isAnagram(String1, String str2) {
        char[] charArray1 = str1.toCharArray();
        char[] charArray2 = str2.toCharArray();
        Arrays.sort(charArray1);
        Arrays.sort(charArray2);
        Arrays.equals(charArray1, charArray2);
    }
}

15. a program to count the occurrences of a specific word in a string.

public class WordOccurrenceCount {
    public static void main(String[] args) {
        String str = "Java is a programming language. Java is popular.";
        String[] words = str.split(" ");
        String searchWord = "Java";
        int count = 0;
        for (String word : words {
            if (word.equals(searchWord)) {
                count++;
            }
        }
        System.out.println("Occurrences of '" + searchWord + "': " + count);
    }
}

These are the solutions for the remaining questions. Let me know if there's anything else you'd like to know!

Certainly! Here are the solutions for the remaining questions:

16. Write a program to split a string based on a specific delimiter.

public class StringSplit {
    public static void main(String[] args) {
        String str = "apple,banana,orange,m";
        String[] splitArray = str.split(",");
        for (String s : splitArray) {
            System.out.println);
        }
    }
}

17. Write a to check if a string contains a specific substring.

public class SubstringCheck {
    public static void main(String[] args) {
        String str = ", World!";
        String substring = "World";
        boolean containsSubstring = str.contains(substring);
        System.out.println("Contains '" + substring + "': " + contains);
    }
}

18. Write a program to convert string to an integer in Java.

public classToIntegerConversion {
    public static void main(String[]args) {
        String str = "123";
 int number = Integer.parseInt(str);
        System.out.println(" value: " + number);
    }
}

19. Write a program to check if string is a rotation of another string.

public StringRotationCheck {
    public static void main(String[] args) {
        String str1 = "abcd        String str2 = "cdab";
        String concatenated = str1 + str;
        boolean isRotation = concatenated.contains(str2);
        System.out.println(str2 + " is a rotation of " + str1 + ": " +Rotation);
    }
}

20. Write a program to remove all white spaces from a given string.

public class RemoveWhiteSpaces {
    public static void main(String[] args {
        String str = "Hello, World!";
        String stringWithoutSpaces = str.replaceAll("\\s", "");
        System.out.println("String without spaces: " + stringWithoutSpaces);
    }
}

These are the solutions for the remaining questions. Let me know if there's anything else you'd like to know!