java基础-继承

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Animals 父类：

public class Animals {

private String name;

 

public String getName() {

return name;

}

 

public void setName(String name) {

this.name = name;

}

}

动物子类：

 

public class Dog extends Animals {

private String name;

 

public Dog(String dog) {

// TODO Auto-generated constructor stub

this.name = dog;

}

 

public String getName() {

return name;

}

 

public void setName(String name) {

this.name = name;

}

}

测试类-从添加的信息中挑选出符合条件的信息：

 

package czx.test_extends;

 

public class TestAnimals {

public static void main(String[] args) {

Animals[] as = new Animals[] { new Dog("miaomiao") };

getAllDog(as);

for(int i=0;i<as.length;i++) {

if(as[i]==null) {

continue;

}else {

System.out.println(as[i].getName());

}

}

}

 

public static Dog[] getAllDog(Animals[] a) {

String num;

Dog[] dog = new Dog[a.length];

int s = 0;

for (int j = 0; j < a.length; j++) {

num = a.getClass().getCanonicalName();

if (num.equals("Dog")) {

dog[s] = (Dog) a[j];

s++;

}

}

 

return dog;

 

}

}

转载于:https://my.oschina.net/ZxArvin/blog/1922395