70 lines
2.2 KiB
Java
70 lines
2.2 KiB
Java
// enums/Reflection.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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// Analyzing enums using reflection
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import java.lang.reflect.*;
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import java.util.*;
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import onjava.*;
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enum Explore { HERE, THERE }
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public class Reflection {
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public static Set<String> analyze(Class<?> enumClass) {
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System.out.println(
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"----- Analyzing " + enumClass + " -----");
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System.out.println("Interfaces:");
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for(Type t : enumClass.getGenericInterfaces())
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System.out.println(t);
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System.out.println(
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"Base: " + enumClass.getSuperclass());
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System.out.println("Methods: ");
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Set<String> methods = new TreeSet<>();
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for(Method m : enumClass.getMethods())
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methods.add(m.getName());
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System.out.println(methods);
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return methods;
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}
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public static void main(String[] args) {
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Set<String> exploreMethods =
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analyze(Explore.class);
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Set<String> enumMethods = analyze(Enum.class);
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System.out.println(
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"Explore.containsAll(Enum)? " +
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exploreMethods.containsAll(enumMethods));
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System.out.print("Explore.removeAll(Enum): ");
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exploreMethods.removeAll(enumMethods);
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System.out.println(exploreMethods);
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// Decompile the code for the enum:
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OSExecute.command(
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"javap -cp build/classes/main Explore");
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}
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}
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/* Output:
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----- Analyzing class Explore -----
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Interfaces:
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Base: class java.lang.Enum
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Methods:
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[compareTo, equals, getClass, getDeclaringClass, hashCode,
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name, notify, notifyAll, ordinal, toString, valueOf,
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values, wait]
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----- Analyzing class java.lang.Enum -----
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Interfaces:
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java.lang.Comparable<E>
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interface java.io.Serializable
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Base: class java.lang.Object
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Methods:
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[compareTo, equals, getClass, getDeclaringClass, hashCode,
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name, notify, notifyAll, ordinal, toString, valueOf, wait]
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Explore.containsAll(Enum)? true
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Explore.removeAll(Enum): [values]
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Compiled from "Reflection.java"
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final class Explore extends java.lang.Enum<Explore> {
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public static final Explore HERE;
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public static final Explore THERE;
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public static Explore[] values();
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public static Explore valueOf(java.lang.String);
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static {};
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}
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*/
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