Java tutorial
/** * Copyright 2010 JBoss Inc * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.drools.planner.examples.nqueens.domain; import org.apache.commons.lang.builder.CompareToBuilder; import org.drools.planner.examples.common.domain.AbstractPersistable; /** * @author Geoffrey De Smet */ public class Queen extends AbstractPersistable implements Comparable<Queen> { private int x; private int y; public int getX() { return x; } public void setX(int x) { this.x = x; } public int getY() { return y; } public void setY(int y) { this.y = y; } public int getAscendingD() { return (x + y); } public int getDescendingD() { return (x - y); } public int compareTo(Queen other) { return new CompareToBuilder().append(x, other.x).append(y, other.y).append(id, other.id).toComparison(); } public Queen clone() { Queen clone = new Queen(); clone.id = id; clone.x = x; clone.y = y; return clone; } @Override public String toString() { return super.toString() + " " + x + " @ " + y; } }