83 lines
1.9 KiB
Java
83 lines
1.9 KiB
Java
// generics/ThrowGenericException.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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interface Processor<T, E extends Exception> {
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void process(List<T> resultCollector) throws E;
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}
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class ProcessRunner<T, E extends Exception>
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extends ArrayList<Processor<T, E>> {
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List<T> processAll() throws E {
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List<T> resultCollector = new ArrayList<>();
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for(Processor<T, E> processor : this)
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processor.process(resultCollector);
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return resultCollector;
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}
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}
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class Failure1 extends Exception {}
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class Processor1
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implements Processor<String, Failure1> {
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static int count = 3;
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@Override
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public void process(List<String> resultCollector)
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throws Failure1 {
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if(count-- > 1)
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resultCollector.add("Hep!");
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else
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resultCollector.add("Ho!");
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if(count < 0)
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throw new Failure1();
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}
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}
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class Failure2 extends Exception {}
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class Processor2
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implements Processor<Integer, Failure2> {
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static int count = 2;
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@Override
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public void process(List<Integer> resultCollector)
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throws Failure2 {
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if(count-- == 0)
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resultCollector.add(47);
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else {
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resultCollector.add(11);
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}
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if(count < 0)
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throw new Failure2();
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}
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}
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public class ThrowGenericException {
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public static void main(String[] args) {
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ProcessRunner<String, Failure1> runner =
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new ProcessRunner<>();
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for(int i = 0; i < 3; i++)
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runner.add(new Processor1());
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try {
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System.out.println(runner.processAll());
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} catch(Failure1 e) {
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System.out.println(e);
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}
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ProcessRunner<Integer, Failure2> runner2 =
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new ProcessRunner<>();
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for(int i = 0; i < 3; i++)
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runner2.add(new Processor2());
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try {
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System.out.println(runner2.processAll());
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} catch(Failure2 e) {
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System.out.println(e);
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}
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}
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}
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/* Output:
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[Hep!, Hep!, Ho!]
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Failure2
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*/
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