Develop Reference

How can I write this expression more compactly in Java 8?

How can I write that if more compact using java 8?
Optional.ofNullable(city).ifPresent(c -> {
if (!city.equalsIgnoreCase(district)) {
address.setCity(district + ", " + c);
}
});

As Eran commented, you can avoid the spurious detour over Optional by just directly checking for null:
if (city != null && !district.equalsIgnoreCase(city)) {
address.setCity(district + ", " + city);
}

Using a String that contains operators as a variable on an if-statement

Title is self-explanatory.
Instead of using:
if (link.contains(".com") || (link.contains(".net") || (link.contains(".org") || (link.contains(".info") || ("etc there are many domain names")) {
webView.loadUrl("https://www." + link);
} else {
webView.loadUrl("https://www." + link + ".com");
}
I want to do it this way if possible by declaring the String's values globally.
if (link.contains(domainNames)) {
webView.loadUrl("https://www." + link);
} else {
webView.loadUrl("https://www." + link + ".com");
}

Build a regex with the domain names, then test it, e.g.
private static final Pattern DOMAIN_NAMES = Pattern.compile("\\.(?i:com|net|org|info)$");
if (DOMAIN_NAMES.matcher(link).find()) {
webView.loadUrl("https://www." + link);
} else {
webView.loadUrl("https://www." + link + ".com");
}

Another mannual approach could be :
Domainnamelist.contains(substring from link that contains domain ending)

Java and if NULL

I have never done anything in java before so I really am a newb but while building the program I have ran into a snag that i just can't figure out. I will try to explain and show to the best of my abilities.
Here is what I am building
The UI
Here is the code I have so far to make it work.
private void jButtonGenerateActionPerformed(java.awt.event.ActionEvent evt) {
String ObjectName = jtObjectName.getText();
String ObjectBase = jcbBaseNPC.getSelectedItem().toString();
String NPCName = jtNPCName.getText();
String MinLevel = jtMinLevel.getText();
if (MinLevel != null && MinLevel.isEmpty())
MinLevel = MinLevel.replace(MinLevel, "minLevel" + MinLevel);{
}
//Alignment Combo Box Start
String Alignment = jcbAlignment.getSelectedItem().toString();
if (Alignment.contains("Good")) {
Alignment = Alignment.replace("Good", "255");
}
if (Alignment.contains("Neutral")) {
Alignment = Alignment.replace("Neutral", "127");
}
if (Alignment.contains("Evil")) {
Alignment = Alignment.replace("Evil", "0");
}
//Alignment Combo Box End
// Print to Output Box
jaOutput.append("object" + " " + ObjectName + " " + "of" + " " + ObjectBase +
"\n\tproperties" + "\n\tname" +" " + "\"" + NPCName + "\"" + MinLevel
);
What I can not understand it how to check to see if there is something entered in a String and if there is I need to add to it so the output looks like this.
minLevel 1100
maxLevel 1500
only thing I will be adding is the numbers so i need to add something like
minLevel + MinLevel
and if it is empty just skip it all together. If I add it to the append and its empty I will just get minLevel and i can't have it like that.
Any tips would be great.
Thank you all
Donald

Building Hibernate query depending of parameters that can be nulls

so i am working on a project right now
1st time using Hibernate
in this projet i am using Swing too
i have a form with multiple jTextFields
public List<Object[]> getoperations(String a,String c,String n,String e,String d) {
SessionDao s=new SessionDao();
session=s.getSession();
Query q;
q=session.createQuery("select idTiers,beneficiaire,emetteur,montant,numcompte,t_param_nature_operation.libelleNature,dateValidite,dateCreation where");
if (a != null && !a.isEmpty()) { q+= " and codeBanque='" + a + "'"; }
if (c != null && !c.isEmpty()) { q += " and numCompte='" + c + "'"; }
if (n != null && !n.isEmpty()) { q += " and t_param_nature_operation_.libelleNature='" + n + "'"; }
if (e != null && !e.isEmpty()) { q += " and decision='" + e + "'"; }
if (d != null && !d.isEmpty()) { q += " and dateCreation='" + d + "'"; }
q+= " order by idTiers" ;
return q.list();
}
As you see I am making a test on the values to add them in the query.
My question is there a way to add those values?
since query +="" isn't working.

Personally, I would add Guava utils to my project and use isNotBlank()
function. Anyway, you can write your own static function that would
return true if not null and not empty and false otherwise, and later
use it. It'll make your code much clearer.
The above was my comment and I decided to show you this little piece of code.
public static boolean isBlank(String s) {
if (s == null)
return true;
if (s.isEmpty())
return true;
return false;
}
Now you can simply write:
//static import your isBlank() method
//import static package.classInWhichIsBlankIsDeclared;
if (!isBlank(a) { q+= " and codeBanque='" + a + "'"; }
if (!isBlank(b) { q+= " and codeBanque='" + b + "'"; }
if (!isBlank(c) { q+= " and codeBanque='" + c + "'"; }
if (!isBlank(d) { q+= " and codeBanque='" + d + "'"; }
It's much more readable so it'll be much easier to debug in case of errors in the future.
Please, have a look at DRY principle and follow it. If your issue require checking same condition 4 or 5 times (2 times should be enough to use DRY) consider writing a function. call it the way that it'll be human-friendly instead of combination of different logical statements.
DRY. Don't Repeat Yourself.
"Every piece of knowledge must have a single, unambiguous, authoritative representation within a system"
Wikipedia article about DRY

you should consider using Criteria. it's more clean when dealing with multiple where statements.
eg
Criteria cr = session.createCriteria(YourEntityClass.class);
cr.add(Restrictions.eq("property1", value1));
cr.add(Restrictions.eq("property2", value2));
List results = cr.list();
have a look at these examples here

Is it possible to reverse escape string?

I know both NetBeans and Eclipse has options where if you paste multi-line, un-escaped string into a string variable, it will automatically add escape characters and add line breaks in. Is there a way to reverse the process?
For example:
function ShowHideOptions(trigger, element) {
if( trigger ) {
document.getElementById( element ).style.display = "";
} else {
document.getElementById( element ).style.display = "none";
}
}
if pasted in to string becomes:
private static final String LABEL_JAVASCRIPT = "function ShowHideOptions(trigger, element) {\n"
+ " if( trigger ) {\n"
+ " document.getElementById( element ).style.display = \"\";\n"
+ " } else {\n"
+ " document.getElementById( element ).style.display = \"none\";\n"
+ " }\n"
+ "}";
I want reverse this process.

I believe your question warrants another question. Why?
If you reverse this, the quotes would not be escaped and therefore you would get errors. Example:
System.out.println("System.out.println("Test");");
^
Error, everything after this quote is
considered code
Notice the quotes aren't escaped. This code would generate an error where I marked it because the quotes apparently mean the string should end.
Also, if the newlines are reversed, this example:
System.out.println("test");
System.out.println("test2");
Would become:
System.out.println("test");System.out.println("test2");
The following code works fine. Please clarify the problem.
System.out.println(LABEL_JAVASCRIPT);