28 lines
748 B
Java
28 lines
748 B
Java
//: holding/ApplesAndOrangesWithoutGenerics.java
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// Simple container example (produces compiler warnings).
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// {ThrowsException}
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import java.util.*;
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class Apple {
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private static long counter;
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private final long id = counter++;
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public long id() { return id; }
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}
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class Orange {}
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public class ApplesAndOrangesWithoutGenerics {
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@SuppressWarnings("unchecked")
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public static void main(String[] args) {
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ArrayList apples = new ArrayList();
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for(int i = 0; i < 3; i++)
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apples.add(new Apple());
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// Not prevented from adding an Orange to apples:
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apples.add(new Orange());
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for (Object apple : apples) {
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((Apple) apple).id();
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// Orange is detected only at run time
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}
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}
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} /* (Execute to see output) *///:~
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