package chapter15._7;
import java.util.ArrayList;
public class ErasedTypeEquivalence {
public static void main(String[] args) {
Class c1 = new ArrayList<String>().getClass();
Class c2 = new ArrayList<Integer>().getClass();
System.out.println(c1 == c2);
}
}
输出
true
package chapter15._7;
import java.util.*;
class Frob {}
class Fnorkle {}
class Quark<Q> {}
class Partiicle<POSITION, MOMENTUM> {}
public class LostInformation {
public static void main(String[] args) {
List<Frob> list = new ArrayList<Frob>();
Map<Frob, Fnorkle> map = new HashMap<Frob, Fnorkle>();
Quark<Fnorkle> quark = new Quark<Fnorkle>();
Partiicle<Long, Double> p = new Partiicle<Long, Double>();
System.out.println(Arrays.toString(list.getClass().getTypeParameters()));
System.out.println(Arrays.toString(map.getClass().getTypeParameters()));
System.out.println(Arrays.toString(quark.getClass().getTypeParameters()));
System.out.println(Arrays.toString(p.getClass().getTypeParameters()));
}
}
输出
[E]
[K, V]
[Q]
[POSITION, MOMENTUM]
