FULL PRODUCT VERSION :
java version "1.7.0-ea"
Java(TM) SE Runtime Environment (build 1.7.0-ea-b141)
Java hotSpot(TM) Client VM (build 21.0-b11, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Windows 7 Ultimate 32-bit (6.1.7601, Service Pack 1, Build 7601

A DESCRIPTION OF THE PROBLEM :
I want find max element of array. To do this, I run the following code:

import java.util.Arrays;

public class Main {
    
    public Main() {
    }
    
    private int indexOfMax(double [] srcArray) {
        double [] d = srcArray.clone();
        double [] d1 = d.clone();
        Arrays.sort(d);
        return Arrays.binarySearch(d1, d[d.length - 1]);
    }
    
    public static void main(String [] arg) {
        double [] temp = new double[10];
        temp[0] = 0.4815744900320782;
        temp[1] = 0.9853950553753187;
        temp[2] = 0.020195572196603062;
        temp[3] = 0.4974630862907763;
        temp[4] = 0.5874958585228355;
        temp[5] = 0.635202254872451;
        temp[6] = 0.7153486493049164;
        temp[7] = 0.42789599708037096;
        temp[8] = 0.7125307280379825;
        temp[9] = 0.7928702536478623;
        Main m = new Main();
        System.out.println(m.indexOfMax(temp));
    }
}
 But the resulting value is "-11".

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Create project "Java Application". Head Class must have name is "Main.java". Next run code:

import java.util.Arrays;

public class Main {
    
    public Main() {
    }
    
    private int indexOfMax(double [] srcArray) {
        double [] d = srcArray.clone();
        double [] d1 = d.clone();
        Arrays.sort(d);
        return Arrays.binarySearch(d1, d[d.length - 1]);
    }
    
    public static void main(String [] arg) {
        double [] temp = new double[10];
        temp[0] = 0.4815744900320782;
        temp[1] = 0.9853950553753187;
        temp[2] = 0.020195572196603062;
        temp[3] = 0.4974630862907763;
        temp[4] = 0.5874958585228355;
        temp[5] = 0.635202254872451;
        temp[6] = 0.7153486493049164;
        temp[7] = 0.42789599708037096;
        temp[8] = 0.7125307280379825;
        temp[9] = 0.7928702536478623;
        Main m = new Main();
        System.out.println(m.indexOfMax(temp));
    }
}

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
resulting value must equal is "1"
ACTUAL -
i was get resulting value is "-11"

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.util.Arrays;

public class Main {
    
    public Main() {
    }
    
    private int indexOfMax(double [] srcArray) {
        double [] d = srcArray.clone();
        double [] d1 = d.clone();
        Arrays.sort(d);
        return Arrays.binarySearch(d1, d[d.length - 1]);
    }
    
    public static void main(String [] arg) {
        double [] temp = new double[10];
        temp[0] = 0.4815744900320782;
        temp[1] = 0.9853950553753187;
        temp[2] = 0.020195572196603062;
        temp[3] = 0.4974630862907763;
        temp[4] = 0.5874958585228355;
        temp[5] = 0.635202254872451;
        temp[6] = 0.7153486493049164;
        temp[7] = 0.42789599708037096;
        temp[8] = 0.7125307280379825;
        temp[9] = 0.7928702536478623;
        Main m = new Main();
        System.out.println(m.indexOfMax(temp));
    }
}
---------- END SOURCE ----------