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class Vector {
private int val = 1;
public boolean isEmpty() {
if (val == 1) { // compares with 1 instead of 0
return true;
} else {
return false;
}
}
// other functionality is same as java.util.Vector
}
// import java.util.Vector; omitted
public class VectorUser {
public static void main(String[] args) {
Vector v = new Vector();
if (v.isEmpty()) {
System.out.println("Vector is empty");
}
}
}
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When the developer and organization control the original shadowed class, it may be preferable to change the design strategy of the original in accordance with Bloch's _Effective Java_ \[[Bloch 2008|AA. Bibliography#Bloch 08]\], Item 16, _Prefer interfaces to abstract classes_. Changing the original class into an interface would permit class {{MyVector}} to declare that it implements the hypothetical {{Vector}} interface. This would permit client code that intended to use {{MyVector}} to remain compatible with code that uses the original implementation of {{Vector}}. |
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<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="c3b49d5292df3f9b-600cc677-4ef549df-8d56966d-20de6400335da72fd912b3e5"><ac:plain-text-body><![CDATA[ | [[JLS 2005 | AA. Bibliography#JLS 05]] | [§6.3.2, Obscured Declarations | http://java.sun.com/docs/books/jls/third_edition/html/names.html#6.3.2] | ]]></ac:plain-text-body></ac:structured-macro> |
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<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="fa5a22ff63c86607-178064ac-4003487f-b05ca3be-f90e34a20dae76683ee05a15"><ac:plain-text-body><![CDATA[ | [[FindBugs 2008 | AA. Bibliography#FindBugs 08]] | ]]></ac:plain-text-body></ac:structured-macro> | ||
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="e3350fb703f8e286-0796992e-44ff4af6-95459f26-58300ba7445a515b0153b72a"><ac:plain-text-body><![CDATA[ | [[Bloch 2005 | AA. Bibliography#Bloch 05]] | Puzzle 67, All strung out | ]]></ac:plain-text-body></ac:structured-macro> | |
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="837d81139bb71240-97e0da27-4863448f-92f597e8-75a87d0d34097e5f23b100f0"><ac:plain-text-body><![CDATA[ | [[Bloch 2008 | AA. Bibliography#Bloch 08]] | Item 16, Prefer interfaces to abstract classes | ]]></ac:plain-text-body></ac:structured-macro> |
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