Can anyone help me on the error messages generated in test1 ? - i'm playing with genetic algorithms

Answer 1

random() is not a method.

You can import the Random class:

import java.util.Random; // top of program

Then use either:
Random name = new Random();
name.nextInt(((max - min) + 1) + min);

or

new Random().nextInt(((max - min) + 1) + min);

To generate a random number (int) from (x,y); where max = y, min = x.

Let me know if there are any more errors after this fix.

edit: To add to what I said, for a random number from 0 to x-1 you can just use Math.random().
So for a random number where you wrote: "int midPoint = int(random" etc.. to the array length.
You could do: int midPoint = (int)(Math.random()*genes.length);
Instead of having to make/use a Random object.

extra info:
This is allowed because the random() method is static, so you can call the method random() in Math without creating an instance of the Math class.

Answer 2

Thanks for your help restoring faith - unfortunately - I get these error messages:

..\Playground\:9: error: illegal start of type
import java.util.Random;
^
..\Playground\:9: error: ';' expected
import java.util.Random;
^
..\Playground\:9: error: illegal start of type
import java.util.Random;
^
..\Playground\:9: error: ';' expected
import java.util.Random;
^
..\Playground\:9: error: <identifier> expected
import java.util.Random;
^
..\Playground\:33: error: '.class' expected
int midpoint = int(random(genes.length));
^
..\Playground\:33: error: ';' expected
int midpoint = int(random(genes.length));
^
7 errors

This is just from adding:

import java.util.Random; // top of program