?? valueobject.java
字號:
package com.ora.rmibook.chapter13.bank.valueobjects;
import java.io.*;
public abstract class ValueObject implements Serializable {
private String _stringifiedRepresentation;
private boolean _alreadyHashed;
private int _hashCode;
public ValueObject(String stringifiedRepresentation) {
_stringifiedRepresentation = stringifiedRepresentation;
_alreadyHashed = false;
}
public String toString() {
return _stringifiedRepresentation;
}
public int hashCode() {
if (false == _alreadyHashed) {
_hashCode = _stringifiedRepresentation.hashCode();
_alreadyHashed = true;
}
return _hashCode;
}
}
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