61 lines
1.4 KiB
Java
61 lines
1.4 KiB
Java
// staticchecking/latent/Latent.java
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// (c)2017 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://OnJava8.com for more book information.
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// {java staticchecking.latent.Latent}
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package staticchecking.latent;
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import java.lang.reflect.*;
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class Dog {
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public void talk() {
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System.out.println("Woof!");
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}
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public void reproduce() {}
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}
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class Robot {
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public void talk() {
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System.out.println("Click!");
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}
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public void oilChange() {}
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}
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class Mime {
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public void walkAgainstTheWind() {}
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public String toString() { return "Mime"; }
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}
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class Communicate {
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public static void speak(Object speaker) {
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try {
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Class<? extends Object> spkr =
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speaker.getClass();
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Method talk =
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spkr.getMethod("talk", (Class[])null);
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talk.invoke(speaker, new Object[]{});
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} catch(NoSuchMethodException e) {
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System.out.println(
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speaker + " cannot talk");
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} catch(IllegalAccessException e) {
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System.out.println(
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speaker + " IllegalAccessException");
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} catch(InvocationTargetException e) {
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System.out.println(
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speaker + " InvocationTargetException");
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}
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}
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}
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public class Latent {
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public static void main(String[] args) {
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Communicate.speak(new Dog());
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Communicate.speak(new Robot());
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Communicate.speak(new Mime());
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}
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}
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/* Output:
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Woof!
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Click!
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Mime cannot talk
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*/
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