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public final class CreditCard { private final int number; public CreditCard(int number) { this.number = (short) number; } public boolean equals(Object o) { if (o == this) { return true; } if (!(o instanceof CreditCard)) { return false; } CreditCard cc = (CreditCard)o; return cc.number == number; } public int hashCode() { int result = 717; result = 3731 * result + number; return result; } public static void main(String[] args) { Map<CreditCard, String> m = new HashMap<CreditCard, String>(); m.put(new CreditCard(100), "4111111111111111"); System.out.println(m.get(new CreditCard(100))); } } |
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<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="7b51d10ea7abf7d9-ff53a735-43f449b1-a7bc9cc9-4e22df09f7e4b4e79ced3d4c"><ac:plain-text-body><![CDATA[ | [[API 2006 | AA. Bibliography#API 06]] | [Class Object | http://java.sun.com/javase/6/docs/api/java/lang/Object.html] | ]]></ac:plain-text-body></ac:structured-macro> |
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="3f158cc67fdd2e91-62254345-4b3645cf-9a088248-15743bf90839a0a16fbd7a43"><ac:plain-text-body><![CDATA[ | [[Bloch 2008 | AA. Bibliography#Bloch 08]] | Item 9. Always override | ]]></ac:plain-text-body></ac:structured-macro> |
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