JAVA编程思想 Ch3.6题

练习6:在练习5的基础上，创建一个新的Dog索引，并对其赋值为Spot对象。测试用==和equals（）方法来比较引用结果。

 public class quan {
     String name;
     String says;
 
     public void setName(String name){
         this.name =name;
     }
 
     public String getName() {
         return name;
     }
 
     public String getSays() {
         return says;
     }
 
     public void setSays(String says) {
         this.says = says;
     }
 }

public class Dog {
 
    public static void main(String[] args) {
        quan spot = new quan();
        quan scruffy = new quan();
        quan xiaoQ = new quan();
 
        spot.setName("spot");
        scruffy.setName("scruffy");
        xiaoQ.setName("spot");
 
        spot.setSays("Ruff!");
        scruffy.setSays("Wuff!");
        xiaoQ.setSays("Ruff!");
 
        System.out.println(spot.getName());
        System.out.println(spot.getSays());
        System.out.println(scruffy.getName());
        System.out.println(scruffy.getSays());
        System.out.println(xiaoQ.getName());
        System.out.println(xiaoQ.getSays());
 
        //引用不相等之前
        System.out.println("spot.equals(xiaoQ):" + spot.equals(xiaoQ));
        System.out.print("spot == xiaoQ:");
        System.out.println(spot == xiaoQ);
 
        xiaoQ = spot;
 
        //将spot引用赋值给xiaoQ
        System.out.println("spot.equals(xiaoQ):" + spot.equals(xiaoQ));
        System.out.print("spot == xiaoQ:");
        System.out.println(spot == xiaoQ);
    }
}