Java Collection Tutorial - Java Arrays.binarySearch(int[] a, int key)

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Syntax

Arrays.binarySearch(int[] a, int key) has the following syntax.

public static int binarySearch(int[] a,  int key)

Example

In the following code shows how to use Arrays.binarySearch(int[] a, int key) method.

Binary search needs sorted arrays.

// w w w .  jav  a  2  s  .com
import java.util.Arrays;

public class Main {
 
   public static void main(String[] args) {

    // initializing sorted int array
    int intArr[] = {10,20,25,32,55};

    // value to search
    int searchVal = 32;

    int retVal = Arrays.binarySearch(intArr,searchVal);
  
    System.out.println("The index of element 32 is : " + retVal);
  }
}

The code above generates the following result.

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