55 lines
1.4 KiB
Java
55 lines
1.4 KiB
Java
//: interfaces/classprocessor/Apply.java
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package interfaces.classprocessor;
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import java.util.*;
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import static net.mindview.util.Print.*;
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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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Object process(Object input) { return input; }
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}
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class Upcase extends Processor {
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@Override
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String process(Object input) { // Covariant return
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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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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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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 Apply {
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public static void process(Processor p, Object s) {
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print("Using Processor " + p.name());
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print(p.process(s));
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}
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public static 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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process(new Upcase(), s);
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process(new Downcase(), s);
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process(new Splitter(), s);
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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, incorrect]
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*///:~
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