Java Arrays with clear crystal examples

Java Arrays with clear crystal examples

• 1.
  Arrays • What isan Array? - A collection of elements of the same data type stored in contiguous memory locations. • Why use Arrays? - To store multiple values in a single variable, which makes code efficient and manageable. • When to use Arrays? - When you need to store a fixed number of elements. • Where is it stored? - In the memory (RAM), starting from a base address.
• 2.
  Arrays - ExampleCode • int[] numbers = {1, 2, 3, 4, 5};
• 3.
  One Dimensional Arrays •What is a 1D Array? - An array with a single row of elements. • Why use 1D Array? - To represent a list or sequence of elements. • When to use 1D Array? - When data is linear like marks of students, or daily temperatures. • Where is it stored? - In a continuous block in memory. • How is it stored? - Elements are indexed starting from 0.
• 4.
  One Dimensional Arrays- Example Code • int[] marks = new int[5]; • marks[0] = 95;
• 5.
  Two Dimensional Arrays •What is a 2D Array? - An array of arrays, with rows and columns. • Why use 2D Array? - To represent matrices, tables, or grids. • When to use 2D Array? - When data is in row- column format, like a chessboard. • Where is it stored? - As a contiguous memory block logically structured in rows and columns. • How is it stored? - Stored in row-major or column-major order based on language.
• 6.
  Two Dimensional Arrays- Example Code • int[][] matrix = {{1, 2}, {3, 4}};
• 7.
  Array Manipulation • Whatis Array Manipulation? - Modifying elements: insert, delete, update, traverse. • Why manipulate Arrays? - To manage and utilize stored data effectively. • When to manipulate Arrays? - When you need to change existing data. • Where is it stored? - Operations affect the existing array memory space. • How is it stored? - Changes are done in-place or using new arrays.
• 8.
  Array Manipulation -Example Code • int[] arr = {1, 2, 3}; • arr[1] = 10; // Update second element