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  1. import java.util.List;
  2. import java.util.LinkedList;
  3.  
  4. abstract class Base {
  5.     private List<String> strings;
  6.  
  7.     public Base() {
  8.         this.strings = new LinkedList<String>();
  9.     }
  10.  
  11.     protected void remember(String s) {
  12.         this.strings.add(s);
  13.     }
  14.  
  15.     public int rememberedCount() {
  16.         return this.strings.size();
  17.     }
  18. }
  19.  
  20. class Derived extends Base {
  21.     public Derived() {
  22.         super();
  23.         this.remember("one");
  24.         this.remember("two");
  25.         // Would fail with error:
  26.         // this.strings.add("three");
  27.     }
  28. }
  29.  
  30. class Test {
  31.     public static void main(String[] args) {
  32.         Derived d = new Derived();
  33.         System.out.println(d.rememberedCount()); // 3
  34.     }
  35. }
Success #stdin #stdout 0.1s 320512KB
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https://ideone.com/gSwvOL
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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