java - Bad operand types

Question

 public double getRandKg(double[] value)
{
    double min = 0.0;
    double max = 0.0;

    value * 0.90 = min;          <------ this is where it says bad operand
    value * 1.10 = max;                   types for binary operator '*'
    Random r = new Random();              first type double[] second type double

    double randomValue = min + (((max-min)+1) * r.nextDouble());
    return randomValue;                                                                         //

}

It's late and maybe I just can't think straight. It's just saying I can't multiply a double[] by a double?

Answer 1

double[] is an array. How can you multiply an array of double values with a single double value?

use double[someIndex] * doubleVar to multiply with a single value, and put the expression on the right side, not the left.

Answer 2

I believe you are trying to set the values for min and max. In which case you are doing the wrong way round.

It should be:

min = value * 0.90;          
max = value * 1.10;

http://docs.oracle.com/javase/tutorial/reflect/member/fieldValues.html

--

Also you cannot multiply an array by a double. You should refer to which key=>value in the array you want to use.

For example

min = value[0] * 0.90;
min = value[0] * 0.90;

Where value[0] refers to the first array index (as arrays start from 0)

http://docs.oracle.com/javase/tutorial/java/nutsandbolts/arrays.html