Java for Begineers

Explain the Bubble Sort algorithm and its time complexity.

Antwoord: Start at the beginning of the array. Compare the current element with the next element. If the current element is greater than the next element, swap them. Move to the next pair of elements and repeat steps 2-3. Continue this process for each element in the array. After one full pass, the largest element will be in its correct position. Repeat the process for the remaining unsorted elements until the entire array is sorted. Time Complexity of Bubble Sort: Best-case time complexity: O(n) Average-case time complexity: O(n^2) Worst-case time complexity: O(n^2)

Explain how to reverse a string in C.

Antwoord: #include <stdio.h> #include <string.h> void reverseString(char str[]) { int length = strlen(str); int i, j; char temp; for (i = 0, j = length - 1; i < j; i++, j--) { temp = str[i]; str[i] = str[j]; str[j] = temp; } } int main() { char inputString[100]; printf(\"Enter a string: \"); scanf(\"%s\", inputString); reverseString(inputString); printf(\"Reversed string: %s\\n\", inputString); return 0; }

What is null pointer in C ?

Antwoord: A pointer that does not refer to ay address of value but NULL is known as a NULL pointer. When we assign \'0\' value to pointer of a any type. It becomes NULL.

Define Normalization ?

Antwoord: Normalization is a process used in database design to eliminate redundancy and ensure data integrity by organizing the database tables and attributes in a structured manner. It involves breaking down complex tables into smaller, related tables and arranging data to reduce duplication. The goal of normalization is to minimize data anomalies like insertion, update, and deletion anomalies, and to ensure that data is stored efficiently and logically. The process typically involves applying a series of normal forms (such as First Normal Form, Second Normal Form, etc.) to progressively eliminate redundancy and improve the overall efficiency and maintainability of the database.

What do you mean by aggregation in java?

Antwoord: The term aggregation refers to the relationship between two classes best described as a \"whole/part\" and \"has-a\" relationship. The kind is the most specified version of an association relationship. It contains the references to another class and is said to have ownership of that class.