写了一些代码,但是不知道为什么不可以运行

Game-Over 2014-04-15 01:42:41
public class Cards{
String recipient;

public Cards(String recipient){
this.recipient = recipient;
}

public void greeting(){
System.out.println("Dear " + recipient + ":\n");
System.out.println("Wish you have a wonderful summer!");

}

public class Valentine extends Cards{
private int kisses;
public Valentine(String recipient, int kisses){
super(recipient);
this.kisses = kisses;
}
public void greeting(){
System.out.println("Dear "+ recipient);
System.out.println("Love and kisses, " + kisses);
}}

public class Holiday extends Cards{
public Holiday(String recipient){
super(recipient);
}
public void greeting(){
System.out.println("Dear " + recipient);
System.out.println("Season's Greetings!");
}}

public class Birthday extends Cards{
private int age;
public Birthday(String recipient, int age){
super(recipient);
this.age = age;
}
public void greeting(){
System.out.println("Dear "+ recipient);
System.out.println(" "+ age +"th Birthday!");
}}}




public class CardTest{
public static void main(String[] args)
{
Cards card= new Holiday("Alice");
card.greeting();

card= new Valentine("bob", 12);
card.greeting();

card = new Birthday("Charlie", 4);
card.greeting();
}
}

运行完了之后,不知道为什么会出现这样的情况,求大神帮助
CardTest.java:4: error: cannot find symbol
Cards card= new Holiday("Alice");
^
symbol: class Holiday
location: class CardTest
CardTest.java:7: error: cannot find symbol
card= new Valentine("bob", 12);
^
symbol: class Valentine
location: class CardTest
CardTest.java:10: error: cannot find symbol
card = new Birthday("Charlie", 4);
^
symbol: class Birthday
location: class CardTest
3 errors

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yanweijava 2014-06-04
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public class Cards { String recipient; public Cards(){ } public Cards(String recipient){ this.recipient = recipient; } public void greeting(){ System.out.println("Dear " + recipient + ":\n"); System.out.println("Wish you have a wonderful summer!"); } public class Valentine extends Cards{ private int kisses; public Valentine(String recipient, int kisses){ super(recipient); this.kisses = kisses; } public void greeting(){ System.out.println("Dear "+ recipient); System.out.println("Love and kisses, " + kisses); } } public class Holiday extends Cards{ public Holiday(String recipient){ super(recipient); } public void greeting(){ System.out.println("Dear " + recipient); System.out.println("Season's Greetings!"); } } public class Birthday extends Cards{ private int age; public Birthday(String recipient, int age){ super(recipient); this.age = age; } public void greeting(){ System.out.println("Dear "+ recipient); System.out.println(" "+ age +"th Birthday!"); } } public static void main(String[] args) { Cards cards = new Cards(); Cards car = cards.new Holiday("test"); car.greeting(); } } //内部类要通过外部类实例化之后才能实例化
泥称已被使用 2014-06-03
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你的文件名是CardTest 么?
wang_huanming 2014-06-03
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指出几个问题: 1、同一个java文件中只允许有一个public class,其他的都不可以是public的。 2、子类可以重写父类的构造函数,但仅限于重写,而不是重载,也就是说子类的构造函数参数类型、个数都必须与父类的一致,不能有不一致的构造函数出现
yuhouqingchen_2648 2014-05-21
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问题所在就是你没有导包。。
Fate- 2014-04-15
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Valentine valentine = new Valentine(“”,“”); 应该用子类去new 吧
Game-Over 2014-04-15
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引用 7 楼 jintianhen1 的回复:
楼主还是用 ecipse开发吧,啥年代了还用cmd编译
不是开发。是学习。。
静山晚风 2014-04-15
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楼主还是用 ecipse开发吧,啥年代了还用cmd编译
放码过来吧 2014-04-15
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public class xxx 只能出现一次,class xxx可以出现多次
木鱼121 2014-04-15
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内部类是动态的,也就是开头以public class开头。而主程序是public static class main。在Java中,类中的静态方法不能直接调用动态方法。只有将某个内部类修饰为静态类,然后才能够在静态类中调用该类的成员变量与成员方法。所以在不做其他变动的情况下,最简单的解决办法是将public class改为public static class.
rumlee 2014-04-15
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这些类是不是在同一个包中。
RHuniSoft 2014-04-15
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一个文件里可以有多个类,但是只能有一个public类,并且你的main函数要放在该public类中,其他的类不能是public的,代码该这么写

class Cards{
	String recipient;

	public Cards(String recipient){
		this.recipient = recipient;
	}

	public void greeting(){
		System.out.println("Dear " + recipient + ":\n");
		System.out.println("Wish you have a wonderful summer!");

	}
}

class Valentine extends Cards{
	private int kisses;
	public Valentine(String recipient, int kisses){
		super(recipient);
		this.kisses = kisses;
	}
	public void greeting(){
		System.out.println("Dear "+ recipient);
		System.out.println("Love and kisses, " + kisses);
	}
}

class Holiday extends Cards{
	public Holiday(String recipient){
	super(recipient);
	}
	public void greeting(){
	System.out.println("Dear " + recipient);
	System.out.println("Season's Greetings!");
	}
}

class Birthday extends Cards{
	private int age;
	public Birthday(String recipient, int age){
		super(recipient);
		this.age = age;
	}
	public void greeting(){
		System.out.println("Dear "+ recipient);
		System.out.println(" "+ age +"th Birthday!");
	}
}
public class CardTest {

		public static void main(String[] args)
		{
			Cards card= new Holiday("Alice");
			card.greeting();

			card= new Valentine("bob", 12);
			card.greeting();

			card = new Birthday("Charlie", 4);
			card.greeting();
		}
}
Game-Over 2014-04-15
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引用 1 楼 jintianhen1 的回复:
类都在同一目录下面,最好都是写在一个java文件中,别的类不用public修饰符
对不起啊。。没有看懂你说的是什么意思。
静山晚风 2014-04-15
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类都在同一目录下面,最好都是写在一个java文件中,别的类不用public修饰符

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