Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/StringBuilder.html#substring%28int%29" rel="noreferrer"><code>substring</code></a> is indeed a valid method - but it returns a <code>String</code> reference, not a <code>StringBuilder</code>, so you can't assign the return value to <code>sb1</code>. This should work:</p> <pre><code>String x = sb.append("ing").append("a").substring(0); </code></pre> <p>However, you should <em>also</em> take a step back, and look at the error message again. Make sure you understand every part of it, and ask yourself why that wasn't enough information to diagnose the issue yourself. This sort of self-evaluation should help you diagnose future problems without consulting the community. (I'm sure many people are happy to help, but it's more efficient for everyone if you can work it out yourself.)</p> <p>One helpful technique here is to reduce the scope of the issue as far as possible - so I'd probably have isolated it to a single method call first:</p> <pre><code>sb.append("ing").append("a"); sb1 = sb.substring(0); </code></pre> <p>At that point, when the second line flags up an error, there's less to consider. The error would be something like:</p> <pre><code>Test.java:11: error: incompatible types     sb1 = sb.substring(0);                       ^   required: StringBuilder   found:    String 1 error </code></pre> <p>Now admittedly that's not the clearest error message in the world, but given that there is <em>no</em> other use of <code>String</code> in that statement, it <em>has</em> to be the return value of the method - whose documentation you should also check as a matter of course, too.</p>
    singulars
    1. This table or related slice is empty.
    1. POWhy does the following invocation of "substring" fail?
      singulars
      1. PTQuestion
    1. PTAnswer
    1. This table or related slice is empty.
    1. USJon Skeet
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POWhy does the following invocation of "substring" fail?
      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. COTotally beat you by 5 seconds :D
      singulars
      1. PO
      1. USJosh M
    2. COI upvoted everything just for good measure ;)
      singulars
      1. PO
      1. USJoren
    3. CO+1 for teaching to read error messages.
      singulars
      1. PO
      1. USJoachim Sauer
 

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