OnJava8-Examples/arrays/SuppliersTest.java

// arrays/SuppliersTest.java
// (c)2016 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://mindviewinc.com/Books/OnJava/ for more book information.
import java.util.function.*;
import onjava.*;

public class SuppliersTest {
  public static int size = 10;
  public static void test(Class<?> surroundingClass) {
    for(Class<?> type : surroundingClass.getClasses()) {
      System.out.print(type.getSimpleName() + ": ");
      try {
        Supplier<?> g = (Supplier<?>)type.newInstance();
        for(int i = 0; i < size; i++)
          System.out.printf(g.get() + " ");
        System.out.println();
      } catch(InstantiationException |
              IllegalAccessException e) {
        throw new RuntimeException(e);
      }
    }
  }
  public static void main(String[] args) {
    test(CountingSupplier.class);
  }
}
/* Output:
Double: 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0
Float: 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0
Long: 0 1 2 3 4 5 6 7 8 9
Integer: 0 1 2 3 4 5 6 7 8 9
Short: 0 1 2 3 4 5 6 7 8 9
String: abcdefg hijklmn opqrstu vwxyzAB CDEFGHI JKLMNOP
QRSTUVW XYZabcd efghijk lmnopqr
Character: a b c d e f g h i j
Byte: 0 1 2 3 4 5 6 7 8 9
Boolean: true false true false true false true false true
false
*/