Practical Java笔记二:不要使用缺省的equal方法

/**
 * 
* @ClassName: GolfBall 
* @Description: 高尔夫球类
* @date 2012-4-5 下午10:11:30 
 */
class GolfBall{
    private String brand; //品牌
    private String make;  //型号
    public GolfBall(String brand, String make) {
        super();
        this.brand = brand;
        this.make = make;
    }
    public String getBrand() {
        return brand;
    }
    public void setBrand(String brand) {
        this.brand = brand;
    }
    public String getMake() {
        return make;
    }
    public void setMake(String make) {
        this.make = make;
    }
    
    @Override
    public boolean equals(Object obj) {
        if(this == obj)
            return true;
        if(obj!=null && getClass() == obj.getClass()){
            GolfBall gb = (GolfBall)obj;
            if(this.brand.equals(gb.getBrand()) && this.make.equals(gb.getMake())){
                return true;
            }
        }
        return false;
    }

public class EqualDemo {
    public static void main(String[] args) {
        GolfBall gb1 = new GolfBall("谢仕玲", "女");
        GolfBall gb2 = new GolfBall("谢仕玲","女");
        if(gb1.equals(gb2)){
            System.out.println("的确是女的!");
        }else{
            System.out.println("不是女的!");
        }
    }

}