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// Convertir un número negativo en positivo. // = 1
Math.abs(-1);

// revisar que un objeto no sea nulo cuando es pasado como paramétro
Long days = getDateDiff(Objects.requireNonNull(Time.parseStringToDate(date)), today);

// Obtener el int de un mes a partir de una fecha.
java.util.Date date= new Date();
Calendar cal = Calendar.getInstance();
cal.setTime(date);

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// Catch valores nulos
disabledUsersOnLDAP.stream()
    .map(User::getUsername)
    .map(usersRepository::findEnabledByUsername)
    .filter(Objects::nonNull) // <-- Util
    .forEach(userEntity -> userEntity.setEnabled(false));

// Obtener el número máximo de una lista
Integer lastPaysheetPaymentId = lst.stream()
    .mapToInt(VwRecalculatedRent::getPaysheetPaymentDetailId)

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function normalizedInt(num){
    var i = parseInt(num);
    return (isNaN(i)) ? 0 : i;
}

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private static String noSlash() {
    String strToken = "$2a$10$RA5//G2xuVVPc1JHa62bE/.uOsTPwdsR3BCFjMDcNojvjisNi/0.ZOsi";

    return strToken.replaceAll("\\/", ""); // $2a$10$RA5G2xuVVPc1JHa62bE.uOsTPwdsR3BCFjMDcNojvjisNi0.ZOsi
}

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/*1.-*/ .center {display: block; margin: auto;} //Se aplica al elemento que deseas centrar.
/*2.-*/ .center {text-align: center;} //Se aplica al padre.
/*3.-*/ .center {margin: 0px auto;} //Se aplica al padre.
/*4.-*/ .text-center {text-align: center;}

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-- Firstly, remove PRIMARY KEY attribute of former PRIMARY KEY
ALTER TABLE <table_name> DROP CONSTRAINT <table_name>_pkey;

-- Then change column name of  your PRIMARY KEY and PRIMARY KEY candidates properly.
ALTER TABLE <table_name> RENAME COLUMN <primary_key_candidate> TO id;

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String string = "004-034556";
String[] parts = string.split("-");
String part1 = parts[0]; // 004
String part2 = parts[1]; // 034556

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package utils;

/**
 * Edited by Edgar Mejía on 08/11/18.
 * @author https://www.dotnetperls.com/between-before-after-java
 * @author http://www.java2s.com/Code/Java/Data-Type/String-substring.htm
 */
public class StrUtils {

    private StrUtils() {

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public static final String SQL_UPDATE = "update person set  usr_name = :name ";
 
final Update update = Ebean.createUpdate(Person.class, SQL_UPDATE);
update.setParameter("name", "new name");
final int updatedRows = update.execute();