Practice 70 Java Search Programming Questions

Practice 70 Java Search Programming Questions

Q1. Write a Java program to search an element in an array using linear search.  
Input: [5, 2, 7, 9, 3] (Search for 7)  
Expected Output: Element found at index 2

Q2. Write a Java program to implement binary search in a sorted array.  
Input: [1, 3, 5, 7, 9] (Search for 5)  
Expected Output: Element found at index 2

Q3. Write a Java program to search for a number in a 2D array using linear search.  
Input: [[1, 4, 7], [3, 8, 2], [6, 5, 9]] (Search for 8)  
Expected Output: Element found at [1][1]

Q4. Write a Java program to search for a string in an array of strings using linear search.  
Input: ["apple", "banana", "cherry"] (Search for "banana")  
Expected Output: Element found at index 1

Q5. Write a Java program to implement binary search in a sorted string array.  
Input: ["apple", "banana", "cherry", "date"] (Search for "cherry")  
Expected Output: Element found at index 2

Q6. Write a Java program to search for an element in an array using a recursive binary search.  
Input: [1, 3, 5, 7, 9] (Search for 5)  
Expected Output: Element found at index 2

Q7. Write a Java program to implement interpolation search in a sorted array.  
Input: [10, 20, 30, 40, 50] (Search for 30)  
Expected Output: Element found at index 2

Q8. Write a Java program to perform a linear search for the first occurrence of an element in an unsorted array.  
Input: [3, 6, 8, 6, 9] (Search for 6)  
Expected Output: Element found at index 1

Q9. Write a Java program to search for the smallest element in an array using linear search.  
Input: [4, 9, 2, 5, 1]  
Expected Output: Smallest element is 1

Q10. Write a Java program to search for the largest element in an array using linear search.  
Input: [4, 9, 2, 5, 1]  
Expected Output: Largest element is 9

Q11. Write a Java program to perform linear search for a key in a sorted array.  
Input: [1, 3, 5, 7, 9] (Search for 7)  
Expected Output: Element found at index 3

Q12. Write a Java program to search for an element in an array and return true if found, otherwise false.  
Input: [2, 4, 6, 8] (Search for 5)  
Expected Output: false

Q13. Write a Java program to perform a linear search on a list of strings and return the index of the string.  
Input: ["java", "python", "ruby"] (Search for "python")  
Expected Output: 1

Q14. Write a Java program to search for a number in an unsorted array and count its occurrences.  
Input: [2, 3, 5, 2, 7, 2] (Search for 2)  
Expected Output: Occurrences of 2: 3

Q15. Write a Java program to implement binary search in a descending order sorted array.  
Input: [9, 7, 5, 3, 1] (Search for 5)  
Expected Output: Element found at index 2

Q16. Write a Java program to search for the first occurrence of a number in an array using linear search.  
Input: [8, 7, 8, 5, 6] (Search for 8)  
Expected Output: First occurrence at index 0

Q17. Write a Java program to search for a string in an array and return its position using linear search.  
Input: ["cat", "dog", "mouse"] (Search for "dog")  
Expected Output: Found at index 1

Q18. Write a Java program to implement binary search on a sorted array of floating-point numbers.  
Input: [1.2, 3.4, 5.6, 7.8] (Search for 5.6)  
Expected Output: Element found at index 2

Q19. Write a Java program to search for an element in a 3x3 matrix using linear search.  
Input: [[1, 2, 3], [4, 5, 6], [7, 8, 9]] (Search for 5)  
Expected Output: Element found at [1][1]

Q20. Write a Java program to search for a character in a string using linear search.  
Input: "programming" (Search for 'g')  
Expected Output: Character found at index 3

Q21. Write a Java program to search for a number in an array and return the index using linear search.  
Input: [5, 9, 2, 8, 7] (Search for 9)  
Expected Output: Element found at index 1

Q22. Write a Java program to search for an element using a recursive linear search.  
Input: [10, 20, 30] (Search for 20)  
Expected Output: Element found at index 1

Q23. Write a Java program to implement ternary search on a sorted array.  
Input: [1, 3, 5, 7, 9] (Search for 7)  
Expected Output: Element found at index 3

Q24. Write a Java program to search for the smallest value in a sorted array using binary search.  
Input: [2, 5, 7, 10]  
Expected Output: Smallest value is 2

Q25. Write a Java program to implement binary search for a string in a sorted array.  
Input: ["apple", "banana", "cherry"] (Search for "banana")  
Expected Output: Element found at index 1

Q26. Write a Java program to search for an element using binary search in a sorted array of integers.  
Input: [1, 3, 5, 7, 9] (Search for 3)  
Expected Output: Element found at index 1

Q27. Write a Java program to search for a substring within a string using linear search.  
Input: "Hello, World!" (Search for "World")  
Expected Output: Substring found at index 7

Q28. Write a Java program to perform linear search and return the index of the last occurrence of a number.  
Input: [1, 2, 3, 2, 5] (Search for 2)  
Expected Output: Last occurrence at index 3

Q29. Write a Java program to search for a key in an array and return true if it exists, otherwise false.  
Input: [4, 8, 12, 16] (Search for 8)  
Expected Output: true

Q30. Write a Java program to search for a value in a list of strings and return the corresponding index.  
Input: ["apple", "banana", "cherry"] (Search for "apple")  
Expected Output: Found at index 0

Q31. Write a Java program to search for the second largest element in an array.  
Input: [10, 20, 30, 40, 50]  
Expected Output: Second largest element is 40

Q32. Write a Java program to search for an element in an unsorted array and return its position.  
Input: [4, 8, 1, 9] (Search for 1)  
Expected Output: Element found at index 2

Q33. Write a Java program to search for a number in an array using the jump search algorithm.  
Input: [1, 3, 5, 7, 9] (Search for 7)  
Expected Output: Element found at index 3

Q34. Write a Java program to search for a character in a string using indexOf().  
Input: "hello" (Search for 'e')  
Expected Output: 1

Q35. Write a Java program to search for a number in a sorted array and return its index using binary search.  
Input: [1, 4, 5, 7, 9] (Search for 4)  
Expected Output: Element found at index 1

Q36. Write a Java program to search for a number in a 2D array and return its position.  
Input: [[1, 2], [3, 4]] (Search for 3)  
Expected Output: Element found at [1][0]

Q37. Write a Java program to search for a value in an array and print "Element not found" if it doesn't exist.  
Input: [3, 6, 9] (Search for 5)  
Expected Output: Element not found

Q38. Write a Java program to search for the index of a specific number in an array and return -1 if not found.  
Input: [4, 2, 6] (Search for 2)  
Expected Output: 1

Q39. Write a Java program to implement search on a list of objects based on a specific field.  
Input: [Person("John"), Person("Doe"), Person("Jane")] (Search for "Doe")  
Expected Output: Found at index 1

Q40. Write a Java program to perform a linear search and return the index of the last matching element.  
Input: [1, 3, 7, 5, 7] (Search for 7)  
Expected Output: 4

Q41. Write a Java program to search for a key in a list of strings and return the number of occurrences.  
Input: ["apple", "banana", "apple", "orange"] (Search for "apple")  
Expected Output: 2

Q42. Write a Java program to search for an integer in an array and return "Not Found" if it doesn't exist.  
Input: [12, 5, 7, 2] (Search for 3)  
Expected Output: Not Found

Q43. Write a Java program to search for an element in a list of integers and return its index using a recursive approach.  
Input: [1, 4, 6, 9] (Search for 9)  
Expected Output: Element found at index 3

Q44. Write a Java program to search for a number in an array and return the total number of occurrences.  
Input: [3, 3, 5, 3, 7] (Search for 3)  
Expected Output: 3

Q45. Write a Java program to search for an element in an unsorted array and print the result.  
Input: [5, 6, 9, 2] (Search for 6)  
Expected Output: Found

Q46. Write a Java program to search for a number in a list of integers using recursive linear search.  
Input: [2, 4, 6, 8] (Search for 6)  
Expected Output: Element found at index 2

Q47. Write a Java program to search for an element in an array and print whether it is present or not.  
Input: [1, 3, 5] (Search for 4)  
Expected Output: Not Found

Q48. Write a Java program to search for the first occurrence of a number using a binary search.  
Input: [1, 2, 2, 3, 4] (Search for 2)  
Expected Output: Element found at index 1

Q49. Write a Java program to search for a number using binary search and return true if the element exists, otherwise false.  
Input: [1, 3, 5, 7, 9] (Search for 5)  
Expected Output: true

Q50. Write a Java program to search for an element in an array and return its index.  
Input: [8, 2, 6] (Search for 2)  
Expected Output: Element found at index 1

Q51. Write a Java program to search for the maximum element in an array.  
Input: [5, 8, 3, 2]  
Expected Output: Maximum element is 8

Q52. Write a Java program to search for a word in a sentence and return its position.  
Input: "The quick brown fox" (Search for "fox")  
Expected Output: Position of "fox" is 16

Q53. Write a Java program to search for an element using binary search in a sorted list.  
Input: [10, 20, 30, 40] (Search for 20)  
Expected Output: Element found at index 1

Q54. Write a Java program to search for the smallest number in an array using binary search.  
Input: [10, 20, 30, 40]  
Expected Output: Smallest number is 10

Q55. Write a Java program to search for a number and check if it is present in a list of numbers.  
Input: [3, 7, 2, 8] (Search for 7)  
Expected Output: Present

Q56. Write a Java program to perform linear search in a 3D array and return the index.  
Input: [[[1, 2], [3, 4]], [[5, 6], [7, 8]]] (Search for 7)  
Expected Output: Element found at [1][1]

Q57. Write a Java program to search for an element in a 1D array using binary search.  
Input: [1, 3, 5, 7] (Search for 5)  
Expected Output: Element found at index 2

Q58. Write a Java program to search for the first character in a string using a linear search.  
Input: "java" (Search for 'a')  
Expected Output: Character found at index 1

Q59. Write a Java program to search for the first occurrence of an element in an array.  
Input: [2, 3, 2, 4] (Search for 2)  
Expected Output: First occurrence at index 0

Q60. Write a Java program to perform a linear search on an array of integers and check if a number exists.  
Input: [5, 9, 3, 7] (Search for 3)  
Expected Output: Number found

Q61. Write a Java program to search for a key and return true if found in a list of integers.  
Input: [1, 4, 7, 9] (Search for 7)  
Expected Output: true

Q62. Write a Java program to search for an element using linear search and return its index.  
Input: [5, 2, 8, 7] (Search for 8)  
Expected Output: 2

Q63. Write a Java program to search for the second smallest element in an array.  
Input: [1, 3, 2, 7, 5]  
Expected Output: Second smallest element is 2

Q64. Write a Java program to search for a value in a 2D array and print its position.  
Input: [[1, 2], [3, 4]] (Search for 4)  
Expected Output: Element found at [1][1]

Q65. Write a Java program to search for the largest number in an array.  
Input: [2, 8, 5, 3]  
Expected Output: Largest number is 8

Q66. Write a Java program to search for an element using binary search on an array.  
Input: [10, 20, 30, 40, 50] (Search for 40)  
Expected Output: Element found at index 3

Q67. Write a Java program to search for the second largest element in a sorted array.  
Input: [10, 20, 30, 40]  
Expected Output: Second largest element is 30

Q68. Write a Java program to search for a word in an array of words.  
Input: ["apple", "banana", "cherry"] (Search for "banana")  
Expected Output: Found at index 1

Q69. Write a Java program to search for an element and print "Not found" if not present.  
Input: [1, 2, 3] (Search for 4)  
Expected Output: Not found

Q70. Write a Java program to perform binary search on a sorted string array and print its index.  
Input: ["apple", "banana", "cherry"] (Search for "cherry")  
Expected Output: Element found at index 2