incomparable types: boolean and double

package weight;
import java.util.*;

public class Weight {

public static void main(String[] args) {

    double height,weight;

    Scanner input=new Scanner(System.in);

    System.out.println("Please enter your weight:");
    weight=input.nextDouble();

    System.out.println("Please enter your height:");
    height=input.nextDouble();

    if (weight<height/2.5)
    {
        System.out.println("Underweight");
    }
    else {
        if (height/2.5==weight==height/2.3)
        {
            System.out.println("Normal");
        }
        else {
            if (height/2.3<weight)
                System.out.println("Overweight");   
        }
    }
}
}

The error appears to be in

              if (height/2.5==weight==height/2.3)

it says "incomparable types: boolean and double"
how can I modify the code so that it can work properly? Thank you