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diff --git a/nlpsolver/ThirdParty/EvolutionarySolver/src/net/adaptivebox/goodness/IGoodnessCompareEngine.java b/nlpsolver/ThirdParty/EvolutionarySolver/src/net/adaptivebox/goodness/IGoodnessCompareEngine.java
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+++ b/nlpsolver/ThirdParty/EvolutionarySolver/src/net/adaptivebox/goodness/IGoodnessCompareEngine.java
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+/**
+ * Description: For comparison of goodness.
+ *
+ * @ Author        Create/Modi     Note
+ * Xiaofeng Xie    Feb 19, 2004
+ * Xiaofeng Xie    May 11, 2004
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * Please acknowledge the author(s) if you use this code in any way.
+ *
+ * @version 1.0
+ * @Since MAOS1.2
+ */
+
+package net.adaptivebox.goodness;
+
+public abstract interface IGoodnessCompareEngine {
+  public static final int LARGER_THAN = 2;
+  public static final int EQUAL_TO = 1;
+  public static final int LESS_THAN = 0;
+
+  /**
+   * check the magnitude of two IEncodeEngine
+   * LARGER_THAN: goodness1 is worse than goodness2
+   * LESS_THAN:   goodness1 is better than goodness2
+   * EQUAL_TO :   goodness1 is eqaul to goodness2
+   **/
+  public abstract int compare(double[] goodness1, double[] goodness2);
+}