Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p><strong>static</strong> means it belongs to the class not an instance, this means that there is only one copy of that variable/method shared between all instances of a particular <strong>Class</strong>.</p> <pre><code>public class MyClass { public static int myVariable = 0; } //Now in some other code creating two instances of MyClass //and altering the variable will affect all instances MyClass instance1 = new MyClass(); MyClass instance2 = new MyClass(); MyClass.myVariable = 5; //This change is reflected in both instances </code></pre> <p><strong>final</strong> is entirely unrelated, it is a way of defining a once only initialization. You can either initialize when defining the variable or within the constructor, nowhere else.</p> <p><strong>note</strong> A note on final methods and final classes, this is a way of explicitly stating that the method or class can not be overridden / extended respectively.</p> <p><strong>Extra Reading</strong> So on the topic of static, we were talking about the other uses it may have, it is sometimes used in static blocks. When using static variables it is sometimes necessary to set these variables up before using the class, but unfortunately you do not get a constructor. This is where the static keyword comes in.</p> <pre><code>public class MyClass { public static List&lt;String&gt; cars = new ArrayList&lt;String&gt;(); static { cars.add("Ferrari"); cars.add("Scoda"); } } public class TestClass { public static void main(String args[]) { System.out.println(MyClass.cars.get(0)); //This will print Ferrari } } </code></pre> <p>You must not get this confused with instance initializer blocks which are called before the constructor <em>per</em> instance.</p>
    singulars
    1. This table or related slice is empty.
    1. PODifference between Static and final?
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USeLRuLL
    1. USJon Taylor
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. CO@madth3 see my edit.
      singulars
      1. PO
      1. USJon Taylor
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload