Hi, when I try generate list with intersection method, I got an StackOverflowError

intersection is not functioning - StackOverflowError about underscore-java HOT 2 CLOSED

javadev commented on April 28, 2024

intersection is not functioning - StackOverflowError

from underscore-java.

Comments (2)

javadev commented on April 28, 2024

Hi,
You may try to add import for underscore library and call for method intersection.

import com.github.underscore.$;

public class Main {
  public static void main(String[] args) {
    List<String> result = $.intersection(...);
  }
}

from underscore-java.

wirelesss commented on April 28, 2024

Thanks,

I found poor performance compared traditional method.

This is my suggestion:
Add intersection and notIntersection methods (2):

import static java.util.Arrays.asList;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import com.github.underscore.$;

import utils.TiempoEnum;
import utils.UtilsTiempo;

public class TestUnderscore2 {

public static <T> List<T> intersection(List<T> list1, List<T> list2) {
    List<T> list = new ArrayList<T>();
    for (T t : list1) {
        if(list2.contains(t)) {
            list.add(t);
        }
    }
    return list;
}

public static <T> List<T> intersection(List<T> list1, List<T> list2) {
    List<T> list = new ArrayList<T>();
    for (T t : list1) {
        if(!list2.contains(t)) {
            list.add(t);
        }
    }
    return list;
}

public static void main(String[] args){
    Date fecha1;
    Date fecha2;
    List<String> resultado;
    fecha1 = new Date();        
    resultado = $.intersection(asList("101", "2", "1", "10"), asList("2", "1"));
    fecha2 = new Date();
    System.out.println("Diff time ms underscore:"+UtilsTiempo.diferenciaEntreFechasMensaje(fecha1, fecha2, TiempoEnum.CTE_TIPO_TIEMPO_MILISEGUNDOS, TiempoEnum.CTE_FORMATO_TIEMPO_EN_UNIDAD));
    System.out.println("resultado100:");
    System.out.println(resultado.toString());

    fecha1 = new Date();        
    resultado = intersection(asList("102", "3", "2", "11"), asList("3", "2"));
    fecha2 = new Date();
    System.out.println("Diff time ms traditional:"+UtilsTiempo.diferenciaEntreFechasMensaje(fecha1, fecha2, TiempoEnum.CTE_TIPO_TIEMPO_MILISEGUNDOS, TiempoEnum.CTE_FORMATO_TIEMPO_EN_UNIDAD));             
    System.out.println("resultado100:");
    System.out.println(resultado.toString());
}