package chapter3.item8;

/**
 * Copyright [2017$] [Wuxinshui]
 * <p>
 * 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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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.
 */

/**
 * Created by wuxinshui on 2017/2/13.
 */
public class Point {
	private final int x;
	private final int y;

	public Point(int x, int y) {
		this.x = x;
		this.y = y;
	}

	@Override
	public boolean equals(Object obj) {
		if (!(obj instanceof Point)) {
			return false;
		}
		//getClass测试代替instanceof 测试
		//只有当对象有相同的实现时，才能使对象等同
		//if (obj==null || this.getClass()!=obj.getClass()) return false;
		Point p = (Point) obj;
		return p.x == x && p.y == y;
	}
}

package chapter3.item8;

/**
 * Copyright [2017$] [Wuxinshui]
 * <p>
 * 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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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.
 */

/**
 * Created by wuxinshui on 2017/2/13.
 */
public class Point {
	private final int x;
	private final int y;

	public Point(int x, int y) {
		this.x = x;
		this.y = y;
	}

	@Override
	public boolean equals(Object obj) {
		if (this==obj) return true;

		if (!(obj instanceof Point)) {
			return false;
		}
		//getClass测试代替instanceof 测试
		//只有当对象有相同的实现时，才能使对象等同
		//if (obj==null || this.getClass()!=obj.getClass()) return false;
		Point p = (Point) obj;
		return p.x == x && p.y == y;
	}
}

add if (this==obj) return true;