Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>The <a href="http://en.wikipedia.org/wiki/Final_%28Java%29" rel="noreferrer"><code>final</code></a> keyword has several usages in Java. It corresponds to both the <a href="http://msdn.microsoft.com/en-us/library/88c54tsw.aspx" rel="noreferrer"><code>sealed</code></a> and <a href="http://msdn.microsoft.com/en-us/library/acdd6hb7.aspx" rel="noreferrer"><code>readonly</code></a> keywords in C#, depending on the context in which it is used.</p> <h2>Classes</h2> <p>To prevent subclassing (inheritance from the defined class):</p> <p><strong>Java</strong> </p> <pre><code>public final class MyFinalClass {...} </code></pre> <p><strong>C#</strong></p> <pre><code>public sealed class MyFinalClass {...} </code></pre> <h2>Methods</h2> <p>Prevent overriding of a <code>virtual</code> method.</p> <p><strong>Java</strong></p> <pre><code>public class MyClass { public final void myFinalMethod() {...} } </code></pre> <p><strong>C#</strong></p> <pre><code>public class MyClass : MyBaseClass { public sealed override void MyFinalMethod() {...} } </code></pre> <p>As Joachim Sauer points out, a notable difference between the two languages here is that Java by default marks all non-static methods as <code>virtual</code>, whereas C# marks them as <code>sealed</code>. Hence, you only need to use the <code>sealed</code> keyword in C# if you want to stop further overriding of a method that has been explicitly marked <code>virtual</code> in the base class.</p> <h2>Variables</h2> <p>To only allow a variable to be assigned once:</p> <p><strong>Java</strong></p> <pre><code>public final double pi = 3.14; // essentially a constant </code></pre> <p><strong>C#</strong></p> <pre><code>public readonly double pi = 3.14; // essentially a constant </code></pre> <p>As a side note, the effect of the <code>readonly</code> keyword differs from that of the <a href="http://msdn.microsoft.com/en-us/library/e6w8fe1b.aspx" rel="noreferrer"><code>const</code></a> keyword in that the <code>readonly</code> expression is evaluated at <em>runtime</em> rather than <em>compile-time</em>, hence allowing arbitrary expressions.</p>
    singulars
    1. This table or related slice is empty.
    1. POWhat is the equivalent of Java's final in C#?
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USJames Wierzba
    1. USNoldorin
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POWhat is the equivalent of Java's final in C#?
      singulars
      1. PTQuestion
    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. COI'd add that all non-static methods in Java are virtual by default. So while in C# you can simply leave out the virtual in the initial definition, you'll need to use "final" to avoid subclasses overriding it in Java
      singulars
      1. PO
      1. USJoachim Sauer
    2. COgood answer - there is one more usage of "final" in java though - on a local variable or method parameter to prevent reassigning it. There is no c# direct equivalent of this.
      singulars
      1. PO
      1. USserg10
    3. CO`readonly` member variables *can* be modified in constructors: http://pastebin.com/AzqzYGiA
      singulars
      1. PO
      1. USrecursive
 

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