39 lines
1.2 KiB
Java
39 lines
1.2 KiB
Java
// collections/AsListInference.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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import java.util.*;
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class Snow {}
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class Powder extends Snow {}
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class Light extends Powder {}
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class Heavy extends Powder {}
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class Crusty extends Snow {}
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class Slush extends Snow {}
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public class AsListInference {
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public static void main(String[] args) {
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List<Snow> snow1 = Arrays.asList(
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new Crusty(), new Slush(), new Powder());
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//- snow1.add(new Heavy()); // Exception
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//- snow1.remove(0); // Exception
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List<Snow> snow2 = Arrays.asList(
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new Light(), new Heavy());
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//- snow2.add(new Slush()); // Exception
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//- snow2.remove(0); // Exception
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List<Snow> snow3 = new ArrayList<>();
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Collections.addAll(snow3,
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new Light(), new Heavy(), new Powder());
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snow3.add(new Crusty());
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snow3.remove(0);
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// Hint with explicit type argument specification:
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List<Snow> snow4 = Arrays.<Snow>asList(
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new Light(), new Heavy(), new Slush());
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//- snow4.add(new Powder()); // Exception
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//- snow4.remove(0); // Exception
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}
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}
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