primitivegenerictest.java

来自「Thinking in JAVA第四版源代码」· Java 代码 · 共 43 行

//: generics/PrimitiveGenericTest.java
import net.mindview.util.*;

// Fill an array using a generator:
class FArray {
  public static <T> T[] fill(T[] a, Generator<T> gen) {
    for(int i = 0; i < a.length; i++)
      a[i] = gen.next();
    return a;
  }
}	

public class PrimitiveGenericTest {
  public static void main(String[] args) {
    String[] strings = FArray.fill(
      new String[7], new RandomGenerator.String(10));
    for(String s : strings)
      System.out.println(s);
    Integer[] integers = FArray.fill(
      new Integer[7], new RandomGenerator.Integer());
    for(int i: integers)
      System.out.println(i);
    // Autoboxing won't save you here. This won't compile:
    // int[] b =
    //   FArray.fill(new int[7], new RandIntGenerator());
  }
} /* Output:
YNzbrnyGcF
OWZnTcQrGs
eGZMmJMRoE
suEcUOneOE
dLsmwHLGEa
hKcxrEqUCB
bkInaMesbt
7052
6665
2654
3909
5202
2209
5458
*///:~