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import java.util.HashMap;
public class DataAccessObject {
private static DataAccessObject instance;
private HashMap<String, Object> objectHash;
private DataAccessObject() {
objectHash = new HashMap<String, Object>();
}
public static synchronized DataAccessObject getInstance() throws Exception {
if (instance == null) {
instance = new DataAccessObject();
}
return instance;
}
public Object get(String key) {
return objectHash.get(key);
}
public void set(String key, Object value) {
objectHash.put(key, value);
}
public void delete(String key) {
objectHash.remove(key);
}
}