50 lines
1.4 KiB
Java
50 lines
1.4 KiB
Java
// interfaces/interfaceprocessor/StringProcessor.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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// {main: interfaces.interfaceprocessor.StringProcessor}
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package interfaces.interfaceprocessor;
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import java.util.*;
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interface StringProcessor extends Processor {
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@Override
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String process(Object input); // (1)
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String s = // (2)
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"If she weighs the same as a duck, she's made of wood";
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public static void main(String[] args) { // (3)
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Applicator.apply(new Upcase(), s);
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Applicator.apply(new Downcase(), s);
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Applicator.apply(new Splitter(), s);
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}
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}
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class Upcase implements StringProcessor {
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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 implements StringProcessor {
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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 implements StringProcessor {
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@Override
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public String process(Object input) {
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return Arrays.toString(((String)input).split(" "));
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}
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}
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/* Output:
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Using Processor Upcase
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IF SHE WEIGHS THE SAME AS A DUCK, SHE'S MADE OF WOOD
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Using Processor Downcase
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if she weighs the same as a duck, she's made of wood
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Using Processor Splitter
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[If, she, weighs, the, same, as, a, duck,, she's, made, of,
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wood]
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*/
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