abstract class Animal {
private String name;
private char sex;
private Date birthday;
public Animal(String name, char sex, Date birthday) {
this.name = name;
this.sex = sex;
this.birthday = birthday;
}
public abstract void act();
}class Tiger extends Animal {
private String name;
private char sex;
private Date birthday;
public Tiger(String name, char sex, Date birthday) {
super(name, sex, birthday);
}
public void act() {
System.out.println("不会游,不能飞");
}
}class Swallow extends Animal {
private String name;
private char sex;
private Date birthday;
public Swallow(String name, char sex, Date birthday) {
super(name, sex, birthday);
}
public void act() {
System.out.println("不会游,能飞");
}
}class Dolphin extends Animal {
private String name;
private char sex;
private Date birthday;
public Dolphin(String name, char sex, Date birthday) {
super(name, sex, birthday);
}
public void act() {
System.out.println("会游,不能飞");
}
}
private String name;
private char sex;
private Date birthday;
public Animal(String name, char sex, Date birthday) {
this.name = name;
this.sex = sex;
this.birthday = birthday;
}
public abstract void act();
}class Tiger extends Animal {
private String name;
private char sex;
private Date birthday;
public Tiger(String name, char sex, Date birthday) {
super(name, sex, birthday);
}
public void act() {
System.out.println("不会游,不能飞");
}
}class Swallow extends Animal {
private String name;
private char sex;
private Date birthday;
public Swallow(String name, char sex, Date birthday) {
super(name, sex, birthday);
}
public void act() {
System.out.println("不会游,能飞");
}
}class Dolphin extends Animal {
private String name;
private char sex;
private Date birthday;
public Dolphin(String name, char sex, Date birthday) {
super(name, sex, birthday);
}
public void act() {
System.out.println("会游,不能飞");
}
}
private String name;
private char sex;
private MyDate birthday; public Animal(String name, char sex, MyDate birthday) {
this.name = name;
this.sex = sex;
this.birthday = birthday;
} public abstract void act();
public String getName(){
return name;
} public char getSex(){
return sex;
} public MyDate getBirthday(){
return birthday;
}
}
是这样吗!那么我再调用问题2设置的List时,我应经如果让信息显示出来。
static void print(String wantToPrint) {
System.out.print(wantToPrint);
} static void println(String wantToPrint) {
System.out.println(wantToPrint);
} public static void main(String[] args) { List list = new ArrayList();
list.add(new Tiger("t1",'0',new MyDate (2001,4,12)));
list.add(new Tiger("t2",'0',new MyDate (2001,2,12)));
list.add(new Tiger("t3",'1',new MyDate (2004,12,10)));
list.add(new Tiger("t4",'1',new MyDate (1997,2,10)));
list.add(new Swallow("s1",'0',new MyDate (1997,2,10)));
list.add(new Swallow("s2",'0',new MyDate (2001,2,12)));
list.add(new Swallow("s3",'1',new MyDate (2001,4,12)));
list.add(new Swallow("s4",'1',new MyDate (2004,12,10)));
list.add(new Dolphin("d1",'1',new MyDate (2004,12,10)));
list.add(new Dolphin("d2",'1',new MyDate (2001,4,12)));
list.add(new Dolphin("d3",'0',new MyDate (2001,2,12)));
list.add(new Dolphin("d4",'0',new MyDate (1997,2,10))); for (int i=0; i<list.size(); i++ ){
//这里面怎么显示对象的内容。
} }
注释:MyDate是我自己的写的日期类。
第三个问题中:
燕子飞的时候,打印一句这样的话: "Swallow <燕子的名字> is flying."
海豚游泳的时候,打印: "Dolphin <海豚的名字> is swimming."这个应该如何实现?