generating 50 random float arraylist value unique

I'm trying to write code that stores 50 randomly generated floating point numbers in an ArrayList. Use a regular for-loop to cycle through the values and remove any that are less than 0.5. Then use a for-each loop to print out the values that remain.

this is my code so far and I don't know where to go from here...

import java.util.ArrayList;

public class fiftyFloats {


public static void main (String [] args){ 

    //create a reference for the array list 
    ArrayList <Float> vals; 

    //reserve space for it in memeory 
    vals = new ArrayList <Float> (50);

    for (int i = 0; i<vals.size(); i++){
        i = new Float
    }
    for (Integer atPos: vals){ 
    System.out.println(vals.toString()); 



}

}
}