I always read the blog Java Revisited and I was reading the article today Why use PreparedStatement in Java JDBC - Example Tutorial . At one point the author talks about parameterization of queries, it is better, safer and more performative to...
Why
System.out.println(Integer.valueOf("0")==Integer.valueOf("0"));
System.out.println(Integer.valueOf("1000")==Integer.valueOf("1000"));
returns
true
false
?
ps. I know == is different from equals()
I have two classes, they are:
Class FilterCity:
public class FiltroCidade {
private int idCandidato;
private List<String> cidades;
public FiltroCidade(){ }
public int getIdCandidato() {
return idCandidato;...
I want to specify the exceptions, not this generalized way, however, item.write only accepts Exception e
public File saveFile(FileItem item, File dirFile, String filename) {
dirFile.mkdirs();
File file = FileUtils...
I wanted to know the best way to do a generic Dao of a project, using Hibernate and JPA in Java.
That's all to avoid setting up a DAO for each object that will persist in the database:
public class ProdutoDao {
private final EntityMana...
Does the IF function only work with Integer or does it also work with String? I was trying to create a program that would ask if you are sure you want to create the password. You can check the code below:
package com.programas.Verificacao2;
im...
I need a help with database in Java. I want to make a database that the program generates a file, such as "database.db" and this file I can access without needing any internet connection, using only the mentioned file.
How do I do this?
Wh...
How can I display the entire exception error code (FullStackTrace) in the Android Log?
try {
//CODE
}catch (Exception e){
Log.e(TAG,e.getStackTrace());
}
I am developing a project in Java and it is in error, I have already found it but I do not understand it.
public class Time{
private String nome;
private ArrayList<Jogador> jogadores;
private Integer gols;
public void a...