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

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Syntax

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

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

Example

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

Binary search needs sorted arrays.

//from  w  ww  . j a v  a2  s.c o m

import java.util.Arrays;

public class Main {

   public static void main(String[] args) {

    // initializing sorted double array
    double doubleArr[] = {5.4,5.5,9.2,9.3,35.4};

    // value search
    double searchVal = 5.4;

    int retVal = Arrays.binarySearch(doubleArr,searchVal);

    System.out.println("The index of element 5.4 is : " + retVal);
  }
}

The code above generates the following result.

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