Databases
StackOverflow2013
Postsdbo
POWhy do I get the "non-static variable this cannot be referenced from a static context" error only when I have inner classes?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POWhy do I get the "non-static variable this cannot be referenced from a static context" error only when I have inner classes?
    primarykey
    data
    text
    <p>I'm struggling on the concept of static vs. non-static. I'm studying this Thread example program(modified, from <a href="https://stackoverflow.com/questions/8677945/java-daemon-threads">here originally</a>), and when I use inner classes I will get the error:</p> <pre><code>Error: non-static variable this cannot be referenced from a static context </code></pre> <p>Here is the error-causing code:</p> <pre><code>public class Main2 { public static void main(String[] args) { Thread simple = new Thread(new SimpleTask()); simple.start(); } class SimpleTask implements Runnable { public void run() { } ; } class DaemonTask implements Runnable { public void run() { int i = 0; } } } </code></pre> <p>However, when I break it out so that it's 3 classes, there's no error.. ie if I make it:</p> <pre><code>public class Main2 { /* contents */ } class SimpleTask implements Runnable { /* contents */ } class DaemonTask implements Runnable { /* contents */ } </code></pre> <p>Then it compiles just fine. Why does it matter that we split it out into another class? </p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USCommunity
    1. USCoffee
    plurals
    1. PL
      singulars
      1. LTLinked
    2. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POWhy do I get the "non-static variable this cannot be referenced from a static context" error only when I have inner classes?
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POWhy do I get the "non-static variable this cannot be referenced from a static context" error only when I have inner classes?
      1. This table or related slice is empty.
      1. VTApproveEditSuggestion
    3. VO
      singulars
      1. POWhy do I get the "non-static variable this cannot be referenced from a static context" error only when I have inner classes?
      1. This table or related slice is empty.
      1. VTUpMod
    1. This table or related slice is empty.
 

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