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  1. import java.lang.reflect.Array;
  2. import java.util.stream.*;
  3. import java.util.*;
  4.  
  5. import static java.lang.System.err;
  6.  
  7.  
  8. abstract class Table {
  9.   protected String name = null;
  10.   protected List<Column<?>> columns;
  11.   protected Column<?>[] arrColumns = null;
  12.  
  13.   public Column<?>[] getColumnsAsArray() {
  14.       if (null == columns) {
  15.           return null;
  16.       }
  17.       Column<?>[] arr = (Column<?>[]) Array.newInstance(Column.class, columns.size());
  18.       return columns.toArray(arr);
  19.   }
  20.  
  21.   abstract class Column < V > {
  22.     String name = null;
  23.     Integer type = null;
  24.  
  25.     class Value < V > {
  26.       V value;
  27.  
  28.       Value(V value) {
  29.         this.value = value;
  30.       }
  31.     }
  32.  
  33.     public String toString() {
  34.       return name + ": " + type.toString();
  35.     }
  36.   }
  37.  
  38.   public String toString() {
  39.     return this.name + "\nlist: (" + columns.stream().map(Column::toString).collect(Collectors.joining(", ")) + ")"
  40.                      + "\narr: (" + Stream.of(arrColumns).map(Column::toString).collect(Collectors.joining(", ")) + ")";
  41.   }
  42. }
  43.  
  44. class Delivery extends Table {
  45.   {
  46.     name = "Delivery";
  47.   }
  48.  
  49.   class Number extends Table.Column<Number> {
  50.     {
  51.       name = "Number";
  52.       type = 1;
  53.     }
  54.   }
  55.  
  56.   class Date extends Table.Column<String> {
  57.     {
  58.       name = "Date";
  59.       type = 10;
  60.     }
  61.   }
  62. }
  63.  
  64. public class Main {
  65.  
  66.   public static void main(String[] args) {
  67.     Delivery delivery = new Delivery();
  68.     delivery.columns = Arrays.asList(delivery.new Number(), delivery.new Date());
  69.  
  70.     delivery.arrColumns = delivery.getColumnsAsArray();
  71.  
  72.     err.println(delivery);
  73.  
  74.     Arrays.stream(delivery.arrColumns)
  75.           .map(Object::getClass)
  76.           .forEach(System.out::println);
  77.   }
  78. }
Success #stdin #stdout #stderr 0.15s 38504KB
comments ()
stdin
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Standard input is empty
stdout
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class Delivery$Number
class Delivery$Date
stderr
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Delivery
list: (Number: 1, Date: 10)
arr: (Number: 1, Date: 10)
https://ideone.com/jnavay
language:
Java (HotSpot 12)
created:
4 years ago
visibility:
public

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