1.1 --- a/samples/erasure/src-api1.0/api/Erasure.java	Wed Aug 08 22:06:45 2012 +0200
     1.2 +++ b/samples/erasure/src-api1.0/api/Erasure.java	Wed Aug 08 22:25:24 2012 +0200
     1.3 @@ -1,13 +1,13 @@
     1.4  package api;
     1.5  
     1.6 -import java.util.Set;
     1.7 +import java.util.Collection;
     1.8  
     1.9  public class Erasure {
    1.10      private Erasure() {
    1.11      }
    1.12  
    1.13      // BEGIN: variance.erasure.v1
    1.14 -    public static boolean arePositive(Set<? extends Integer> numbers) {
    1.15 +    public static boolean arePositive(Collection<? extends Integer> numbers) {
    1.16          for (Integer n : numbers) {
    1.17              if (n <= 0) {
    1.18                  return false;

     2.1 --- a/samples/erasure/src-api2.0/api/Erasure.java	Wed Aug 08 22:06:45 2012 +0200
     2.2 +++ b/samples/erasure/src-api2.0/api/Erasure.java	Wed Aug 08 22:25:24 2012 +0200
     2.3 @@ -1,13 +1,13 @@
     2.4  package api;
     2.5  
     2.6 -import java.util.Set;
     2.7 +import java.util.Collection;
     2.8  
     2.9  public class Erasure {
    2.10      private Erasure() {
    2.11      }
    2.12  
    2.13      // BEGIN: variance.erasure.v2
    2.14 -    public static boolean arePositive(Set<? extends Number> numbers) {
    2.15 +    public static boolean arePositive(Collection<? extends Number> numbers) {
    2.16          for (Number n : numbers) {
    2.17              if (n.doubleValue() <= 0.0d) {
    2.18                  return false;

     3.1 --- a/samples/erasure/src-impl/test/ErasureTest.java	Wed Aug 08 22:06:45 2012 +0200
     3.2 +++ b/samples/erasure/src-impl/test/ErasureTest.java	Wed Aug 08 22:25:24 2012 +0200
     3.3 @@ -1,18 +1,14 @@
     3.4  package test;
     3.5  
     3.6 -import api.Erasure;
     3.7 -import java.util.Set;
     3.8 -import java.util.TreeSet;
     3.9 +import static api.Erasure.arePositive;
    3.10 +import java.util.Arrays;
    3.11 +import java.util.List;
    3.12  
    3.13  public class ErasureTest {
    3.14      // BEGIN: variance.erasure.test
    3.15      public static void main(String[] args) {
    3.16 -        Set<Integer> oneToTen = new TreeSet<Integer>();
    3.17 -        for (int i = 1; i <= 10; i++) {
    3.18 -            oneToTen.add(i);
    3.19 -        }
    3.20 -        
    3.21 -        boolean positive = Erasure.arePositive(oneToTen);
    3.22 +        List<Integer> oneToTen = Arrays.asList(2, 4, 6, 8, 10);
    3.23 +        boolean positive = arePositive(oneToTen);
    3.24          System.err.println("positive = " + positive);
    3.25          assert positive : "All the numbers are positive: " + oneToTen;
    3.26      }