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  1.  
  2. import java.util.Arrays;
  3.  
  4. class TheList<E>
  5. {
  6.     private E[] data;
  7.  
  8.     @SuppressWarnings({"unchecked"})
  9.     public TheList(int n) {
  10.         data = (E[]) new Object[n];
  11.     }
  12.  
  13.     @SuppressWarnings({"unchecked"})
  14.     public void clear(int n) {
  15.         data = (E[]) new Object[n];
  16.     }
  17.     public void set(int n, E value) {
  18.         data[n] = value;
  19.     }
  20.     public E get(int n) {
  21.         return data[n];
  22.     }
  23.     public int length() { return data.length; }
  24.  
  25.     @Override
  26.     public String toString() {
  27.         return Arrays.toString(data);
  28.     }
  29. }
  30.  
  31. class ListTest {
  32.     public static void main(String[] args) {
  33.         TheList<String> list = new TheList<>(5);
  34.         for (int i=0; i<5; i++) {
  35.             list.set(i, "#"+i);
  36.         }
  37.         System.out.println("list = " + list);
  38.         list.clear(3);
  39.         System.out.println("list = " + list);
  40.     }
  41. }
  42.  
Success #stdin #stdout 0.05s 711168KB
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stdin
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Standard input is empty
stdout
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list = [#0, #1, #2, #3, #4]
list = [null, null, null]
https://ideone.com/6lsSlp
language:
Java (HotSpot 12)
created:
8 years ago
visibility:
public

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