Arrays Class in Java
Introduction
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Definition:
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Arraysis the predefined class which is present injava.utilpackage. - It provides static methods to dynamically manipulate arrays, such as sorting, searching and copying arrays.
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Use / Need:
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Arrays in Java are fixed in size once created.
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The
Arraysclass provides utility methods to perform common operations efficiently without writing custom code. -
Syntax:
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public final class Arrays { // static methods } -
We don't create an object of
Arrayclass. Instead, you use its **static methods** like:-
Arrays.methodName(arguments);
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Characteristics:
Arraysis a final class, so it cannot be extended.- All methods are static, hence called using the class name directly.
- Works with both primitive arrays and object arrays.
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Advantages:
- Reduces the need to write boilerplate code for array operations.
- Provides optimized and tested methods from the JDK.
- Makes code more readable and maintainable.
Important Methods of Arrays Class
| Method | Description | Example |
|---|---|---|
sort(array) |
Sorts the specified array in ascending order. | Arrays.sort(arr); |
binarySearch(array, key) |
Searches for a key in a sorted array and returns its index; returns negative if not found. | int index = Arrays.binarySearch(arr, 50); |
copyOf(original, newLength) |
Copies the original array to a new array of specified length. | int[] newArr = Arrays.copyOf(arr, 10); |
copyOfRange(original, from, to) |
Copies a specified range from the original array into a new array. | int[] part = Arrays.copyOfRange(arr, 2, 5); |
equals(array1, array2) |
Checks if two arrays are equal (same length and same elements). | boolean isEqual = Arrays.equals(arr1, arr2); |
fill(array, value) |
Assigns the specified value to all elements of the array. | Arrays.fill(arr, 0); |
toString(array) |
Returns a string representation of the array. | System.out.println(Arrays.toString(arr)); |
deepToString(array) |
Returns a string representation of a multidimensional array. | System.out.println(Arrays.deepToString(arr2D)); |
hashCode(array) |
Returns the hash code of the array. | int code = Arrays.hashCode(arr); |
deepEquals(array1, array2) |
Checks equality for multidimensional arrays. | boolean isEqual = Arrays.deepEquals(arr2D1, arr2D2); |
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Note :
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All methods of
Arraysclass are static, so you can call them directly usingArrays.methodName(). -
Import Statement: Before using, import the class:
import java.util.Arrays;
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All methods of
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