Databases
StackOverflow2013
Postsdbo
POBasic constructor chaining calls
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POBasic constructor chaining calls
    primarykey
    data
    text
    <p>I hope this is not a silly question.<br> Having 3 basic constructors</p> <pre><code>public MyClass(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); // TODO Auto-generated constructor stub } public MyClass(Context context, AttributeSet attrs) { super(context, attrs); // TODO Auto-generated constructor stub } public MyClass(Context context) { super(context); // TODO Auto-generated constructor stub } </code></pre> <p>Each calls the <code>super</code> class constructor first. So does it mean all common constructor code I have to put in a private method like this?:</p> <pre><code>public MyClass(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); common(context); } public MyClass(Context context, AttributeSet attrs) { super(context, attrs); common(context); } public MyClass(Context context) { super(context); common(context); } private void common(Context context) { ... } </code></pre> <p>I though that I could chain the constructor for common code, but I get an error saying constructor calls must be the first statement in the code.</p> <pre><code>public MyClass(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); this(context, attrs); } public MyClass(Context context, AttributeSet attrs) { super(context, attrs); // Some code this(context); } public MyClass(Context context) { super(context); // Some more code } </code></pre> <p>And the first statement is either the super constructor call or the class constructor call, cannot be both.</p> <pre><code>Constructor call must be the first statement in a constructor </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USLuksprog
    1. USilomambo
    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. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POBasic constructor chaining calls
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POBasic constructor chaining calls
      1. USPSR
      1. VTFavorite
    1. COYou could use `this` to chain the constructors with the initialization code only present in the last constructor called.
      singulars
      1. POBasic constructor chaining calls
      1. USLuksprog
 

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