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Java Arrays Class

? Java Arrays Class

? Quick Overview

The Arrays class in Java is part of java.util package. It provides utility methods to work with arrays such as sorting, searching, comparing, and converting arrays to strings.

? Key Concepts

  • Belongs to java.util package
  • Contains only static methods
  • Works with primitive and object arrays
  • Helps reduce manual array logic

? Syntax / Theory

To use the Arrays class, import it first:

? View Code Example 
// Importing Arrays utility class
import java.util.Arrays;

? Code Example(s)

? View Code Example 
// Demonstrating common Arrays class methods
import java.util.Arrays;

public class Main {
public static void main(String[] args) {
int[] numbers = {5, 2, 9, 1, 3};

Arrays.sort(numbers);
System.out.println(Arrays.toString(numbers));

int index = Arrays.binarySearch(numbers, 3);
System.out.println(index);
}
}

? Live Output / Explanation

Output:

[1, 2, 3, 5, 9]

2

Explanation: The array is first sorted in ascending order. Then binarySearch() finds the index of element 3.

? Interactive Playground

Edit the numbers below (separated by commas) and click the buttons to simulate Java Array methods.

// Output will appear here...

✅ Tips & Best Practices

  • Always sort the array before using binarySearch()
  • Use Arrays.toString() for easy debugging
  • Prefer utility methods over manual loops

? Try It Yourself

  • Sort an array of strings using Arrays.sort()
  • Compare two arrays using Arrays.equals()
  • Fill an array with a value using Arrays.fill()