51 lines
1.4 KiB
Java
51 lines
1.4 KiB
Java
// interfaces/interfaceprocessor/StringProcessor.java
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// (c)2021 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 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, " +
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"she's made of wood";
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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,
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of, wood]
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*/
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