Databases
StackOverflow2013
Postsdbo
POAccessing class array field
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POAccessing class array field
    primarykey
    data
    text
    <p>I'm having problems accessing a field from an array in a for-loop. I'm sure I'm just messing up the syntax:</p> <pre><code>public class Person { String name; Person mother; Person father; ArrayList&lt;Person&gt; children; public boolean isMotherOf(Person pers1) { //First check if Persons mother equals pers1 if (mother.name == pers1.name) { //Second checks if pers1s children contains Person for (int i = 0; i &lt; pers1.children.size(); i++) { if (pers1.children.name.get(i) == name) { // ERROR ON THE LINE ABOVE: "name cannot be resolved or it not a field" return true; } } // END second check } else { return false; } } // END method isMotherOf } </code></pre> <p>EDIT: My code contained logic errors (compared the wrong persons). Will this safety check work, or will it yield an error if pers1 does not exist when it checks if pers1's mother has a name?</p> <pre><code>public class Person { String name; Person mother; Person father; ArrayList&lt;Person&gt; children; // Checks if THIS person is the mother of pers1 public boolean isMotherOf(Person pers1) { // Safety check: Both persons exists and Person has children and pers1 has mother if (name == null || children == null || pers1 == null || pers1.mother.name == null) { return false; } // END safety check // First check if Persons name equals pers1's mother else if (name.equals(pers1.mother.name)) { // Second check if Persons children contains pers1 for (int i = 0; i &lt; children.size(); i++) { if (children.get(i).name.equals(pers1.name)) { return true; } } // END second check } // END first check return false; } // END method isMotherOf } // END class Person </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USuser1803704
    1. USuser1803704
    plurals
    1. 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. This table or related slice is empty.
    1. COUnrelated to the question, you should compare strings using the `equals` function, not `==`. Otherwise you'll find the comparison almost never works -- see http://stackoverflow.com/questions/513832/how-do-i-compare-strings-in-java for more info.
      singulars
      1. POAccessing class array field
      1. USyshavit
 

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