当我看到Object的clone方法时产生了一个问题:
为什么要用clone方法呢?我完全可以在该类中定义一个方法,在在该方法返回中返回一个该类本身的实例即可。就像下面这个例子:
package excercise.inheritance;
public class Override {
public static void main(String[] args) {
Chicken chicken=new Chicken("vivid","red");
System.out.println(chicken.getName()+" "+chicken.getCrest());
Chicken chickenCP=chicken.getCopied();
//这和clone有什么区别吗?
chickenCP.setCrest("blue");
chickenCP.setName("leo");
System.out.println(chickenCP.getName()+" "+chickenCP.getCrest());
System.out.println(chicken.getName()+" "+chicken.getCrest());
}
}
class Bird{
protected String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Bird(String name){
this.name=name;
}
public Bird getCopied(){
return new Bird(name);
//不必要用clone呀,我可以直接返回一个实例不就行了吗?
}
}
class Chicken extends Bird{
protected String crest;
public String getCrest() {
return crest;
}
public void setCrest(String crest) {
this.crest = crest;
}
public Chicken(String name,String crest) {
super(name);
// TODO Auto-generated constructor stub
this.crest=crest;
}
public Chicken getCopied(){//返回的类为基类的返回类的派生类
return new Chicken(name,crest);
}
}