第二题:
Bird类代码:
1 package zuoye; 2 3 public class Bird { 4 private String name; 5 private String yanse; 6 public String getName() { 7 return name; 8 } 9 public void setName(String name) { 10 this.name = name; 11 } 12 public String getYanse() { 13 return yanse; 14 } 15 public void setYanse(String yanse) { 16 this.yanse = yanse; 17 } 18 public Bird(String name, String yanse) { 19 20 System.out.println("父类构造方法"); 21 this.name = name; 22 this.yanse = yanse; 23 24 } 25 public void eat() 26 { 27 System.out.println("我可以吃虫子"); 28 } 29 30 public void fly() 31 { 32 System.out.println("我可以飞"); 33 } 34 35 }
Yingwu类代码:
1 package zuoye; 2 3 public class Yingwu extends Bird { 4 5 public Yingwu() { 6 super("鹦鹉","绿色"); 7 System.out.println("子类构造方法"); 8 } 9 10 public void sing() 11 { 12 System.out.println("我爱唱歌"); 13 } 14 public void fly() 15 { 16 System.out.println("我喜欢边飞边唱:苍茫的天涯是我的爱~"); 17 } 18 19 20 }
Test类代码:
1 package zuoye; 2 3 public class TestBird { 4 5 public static void main(String[] args) { 6 // TODO Auto-generated method stub 7 Bird b1=new Bird("麻雀","灰色"); 8 System.out.println("我是"+b1.getName()+"颜色是"+b1.getYanse()); 9 b1.eat(); 10 b1.fly(); 11 System.out.println(); 12 Yingwu y1=new Yingwu(); 13 System.out.println("我是"+y1.getName()+"颜色是"+y1.getYanse()); 14 y1.eat(); 15 y1.sing(); 16 y1.fly(); 17 System.out.println(); 18 Bird b2=new Yingwu(); 19 System.out.println("我是"+b2.getName()+"颜色是"+b2.getYanse()); 20 b2.eat(); 21 b2.fly(); 22 23 24 } 25 26 }
第三题:
代码同上,构建子类对象时要先调用子类的构造方法,若构造方法有参数时需添加参数,然后可以继续调用子类或者父类的其他方法。
时间: 2024-11-08 20:37:38