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Java Arrays

Arrays in Java are objects that store multiple values of the same type in a single variable. They are used to store collections of data, making it easy to manage large amounts of information.

Key Topics

1. Declaring Arrays

You can declare an array by specifying the data type followed by square brackets.

int[] myArray;
String[] myStrings;

2. Initializing Arrays

Arrays can be initialized in several ways:

2.1 Using the new Keyword

int[] myArray = new int[5]; // Creates an array of 5 integers

2.2 Using Array Literals

int[] myArray = {1, 2, 3, 4, 5};
String[] myStrings = {"Apple", "Banana", "Cherry"};

3. Accessing Array Elements

Array elements are accessed using their index, which starts at 0.

int[] myArray = {10, 20, 30};
System.out.println(myArray[0]); // Outputs: 10
myArray[1] = 40; // Updates the second element to 40

4. Array Length

You can find the length of an array using the length property.

int[] myArray = {1, 2, 3, 4, 5};
System.out.println("Array length: " + myArray.length); // Outputs: Array length: 5

Key Takeaways

  • Arrays store multiple values of the same type.
  • Use square brackets [] to declare and access arrays.
  • Array indices start at 0.
  • The length property gives the size of the array.
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