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What is the purpose of python's inner classes?
...ed quotation from someone else's answer about a different language (namely Java). Downvoted and I hope others do the same.
– Kevin
Feb 12 '16 at 4:20
5
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What is the difference between up-casting and down-casting with respect to class variable
...use
Downcasting(or narrowing), and Downcasting is not directly possible in Java, explicitly we have to do.
Dog d = new Dog();
Animal a = (Animal) d; //Explicitly you have done upcasting. Actually no need, we can directly type cast like Animal a = d; compiler now treat Dog as Animal but still it i...
How can prepared statements protect from SQL injection attacks?
...uding the information about Aaron which was supposed to be hidden.
import java.sql.*;
public class Inject {
public static void main(String[] args) throws SQLException {
String url = "jdbc:postgresql://localhost/postgres?user=user&password=pwd";
Connection conn = DriverMan...
Jackson - Deserialize using generic class
...;>(){} ... But I am getting the following error - cannot access private java.lang.class.Class() from java.lang.class. Failed to set access. Cannot make a java.lang.Class constructor accessible
– gnjago
Jul 26 '12 at 19:46
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How to start jenkins on different port rather than 8080 using command prompt in Windows?
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Use the following command at command prompt:
java -jar jenkins.war --httpPort=9090
If you want to use https use the following command:
java -jar jenkins.war --httpsPort=9090
Details are here
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How to compare objects by multiple fields
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With Java 8:
Comparator.comparing((Person p)->p.firstName)
.thenComparing(p->p.lastName)
.thenComparingInt(p->p.age);
If you have accessor methods:
Comparator.comparing(Person::getFirstName)
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Replace String in all files in Eclipse
...fill the search box
In the “File name patterns” input box, type in “.java” for replacing all Java files or type in "" to replace in all files
Click “Replace…”
Ctrl+V (Paste). Or type in the value you want to do the replacing
Enter
You can find more details in my blog post: http://bl...
Remove elements from collection while iterating
... new elements during iteration.
Using JDK >= 8
For those working with Java 8 or superior versions, there are a couple of other techniques you could use to take advantage of it.
You could use the new removeIf method in the Collection base class:
ISBN other = new ISBN("0-201-63361-2");
books.re...
Generating all permutations of a given string
...a and ab , but what about longer string such as abcdefgh ? Is there any Java implementation example?
52 Answers
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Backing beans (@ManagedBean) or CDI Beans (@Named)?
I've just started reading through Core JavaServer Faces, 3rd Ed. and they say this (emphasis mine):
5 Answers
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