34 lines
967 B
Java
34 lines
967 B
Java
// generics/LostInformation.java
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// (c)2016 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://mindviewinc.com/Books/OnJava/ for more book information.
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import java.util.*;
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class Frob {}
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class Fnorkle {}
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class Quark<Q> {}
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class Particle<POSITION, MOMENTUM> {}
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public class LostInformation {
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public static void main(String[] args) {
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List<Frob> list = new ArrayList<>();
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Map<Frob, Fnorkle> map = new HashMap<>();
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Quark<Fnorkle> quark = new Quark<>();
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Particle<Long, Double> p = new Particle<>();
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System.out.println(Arrays.toString(
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list.getClass().getTypeParameters()));
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System.out.println(Arrays.toString(
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map.getClass().getTypeParameters()));
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System.out.println(Arrays.toString(
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quark.getClass().getTypeParameters()));
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System.out.println(Arrays.toString(
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p.getClass().getTypeParameters()));
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}
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}
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/* Output:
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[E]
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[K, V]
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[Q]
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[POSITION, MOMENTUM]
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*/
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