34 lines
889 B
Java
34 lines
889 B
Java
// generics/ClassTypeCapture.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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class Building {}
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class House extends Building {}
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public class ClassTypeCapture<T> {
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Class<T> kind;
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public ClassTypeCapture(Class<T> kind) {
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this.kind = kind;
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}
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public boolean f(Object arg) {
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return kind.isInstance(arg);
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}
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public static void main(String[] args) {
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ClassTypeCapture<Building> ctt1 =
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new ClassTypeCapture<>(Building.class);
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System.out.println(ctt1.f(new Building()));
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System.out.println(ctt1.f(new House()));
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ClassTypeCapture<House> ctt2 =
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new ClassTypeCapture<>(House.class);
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System.out.println(ctt2.f(new Building()));
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System.out.println(ctt2.f(new House()));
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}
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}
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/* Output:
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true
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true
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false
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true
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*/
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