genericarraywithtypetoken.java

来自「Thinking in JAVA第四版源代码」· Java 代码 · 共 24 行

//: generics/GenericArrayWithTypeToken.java
import java.lang.reflect.*;

public class GenericArrayWithTypeToken<T> {
  private T[] array;
  @SuppressWarnings("unchecked")
  public GenericArrayWithTypeToken(Class<T> type, int sz) {
    array = (T[])Array.newInstance(type, sz);
  }
  public void put(int index, T item) {
    array[index] = item;
  }
  public T get(int index) { return array[index]; }
  // Expose the underlying representation:
  public T[] rep() { return array; }	
  public static void main(String[] args) {
    GenericArrayWithTypeToken<Integer> gai =
      new GenericArrayWithTypeToken<Integer>(
        Integer.class, 10);
    // This now works:
    Integer[] ia = gai.rep();
  }
} ///:~