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public class test {
    List<Acc> acc;
 
    public static void main(final String[] args) {
    }
 
    public void aab() {
        final StringBuilder builder = new StringBuilder("[");
        this.acc.stream().map(doublie -> doublie.square).forEach(name -> {
 
        });
    }
}
 
class Acc {
 
    
    public static double square(double num){
        return Math.pow(num , 2);
    }
    
    Function<Double, Double> square = Acc::square;
 
}