60 lines
1.5 KiB
Java
60 lines
1.5 KiB
Java
// interfaces/Applicator.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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import java.util.*;
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class Processor {
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public String name() {
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return getClass().getSimpleName();
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}
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public Object process(Object input) {
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return input;
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}
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}
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class Upcase extends Processor {
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@Override // Covariant return:
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public String process(Object input) {
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return ((String)input).toUpperCase();
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}
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}
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class Downcase extends Processor {
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@Override
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public String process(Object input) {
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return ((String)input).toLowerCase();
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}
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}
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class Splitter extends Processor {
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@Override
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public String process(Object input) {
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// The split() argument divides a String into pieces:
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return Arrays.toString(((String)input).split(" "));
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}
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}
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public class Applicator {
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public static void apply(Processor p, Object s) {
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System.out.println("Using Processor " + p.name());
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System.out.println(p.process(s));
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}
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public static final String s =
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"Disagreement with beliefs is by definition incorrect";
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public static void main(String[] args) {
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apply(new Upcase(), s);
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apply(new Downcase(), s);
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apply(new Splitter(), s);
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}
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}
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/* Output:
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Using Processor Upcase
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DISAGREEMENT WITH BELIEFS IS BY DEFINITION INCORRECT
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Using Processor Downcase
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disagreement with beliefs is by definition incorrect
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Using Processor Splitter
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[Disagreement, with, beliefs, is, by, definition,
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incorrect]
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*/
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