72 lines
2.0 KiB
Java
72 lines
2.0 KiB
Java
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//: typeinfo/toys/ToyTest.java
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// <20>2015 MindView LLC: see Copyright.txt
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// Testing class Class.
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package typeinfo.toys;
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import static com.mindviewinc.util.Print.*;
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interface HasBatteries {}
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interface Waterproof {}
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interface Shoots {}
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class Toy {
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// Comment out the following default constructor
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// to see NoSuchMethodError from (*1*)
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Toy() {}
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Toy(int i) {}
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}
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class FancyToy extends Toy
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implements HasBatteries, Waterproof, Shoots {
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FancyToy() { super(1); }
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}
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public class ToyTest {
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static void printInfo(Class cc) {
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print("Class name: " + cc.getName() +
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" is interface? [" + cc.isInterface() + "]");
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print("Simple name: " + cc.getSimpleName());
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print("Canonical name : " + cc.getCanonicalName());
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}
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public static void main(String[] args) {
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Class c = null;
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try {
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c = Class.forName("typeinfo.toys.FancyToy");
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} catch(ClassNotFoundException e) {
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print("Can't find FancyToy");
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System.exit(1);
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}
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printInfo(c);
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for(Class face : c.getInterfaces())
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printInfo(face);
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Class up = c.getSuperclass();
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Object obj = null;
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try {
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// Requires default constructor:
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obj = up.newInstance();
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} catch(InstantiationException e) {
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print("Cannot instantiate");
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System.exit(1);
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} catch(IllegalAccessException e) {
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print("Cannot access");
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System.exit(1);
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}
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printInfo(obj.getClass());
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}
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} /* Output:
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Class name: typeinfo.toys.FancyToy is interface? [false]
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Simple name: FancyToy
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Canonical name : typeinfo.toys.FancyToy
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Class name: typeinfo.toys.HasBatteries is interface? [true]
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Simple name: HasBatteries
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Canonical name : typeinfo.toys.HasBatteries
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Class name: typeinfo.toys.Waterproof is interface? [true]
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Simple name: Waterproof
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Canonical name : typeinfo.toys.Waterproof
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Class name: typeinfo.toys.Shoots is interface? [true]
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Simple name: Shoots
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Canonical name : typeinfo.toys.Shoots
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Class name: typeinfo.toys.Toy is interface? [false]
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Simple name: Toy
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Canonical name : typeinfo.toys.Toy
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*///:~
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