找不到符号是什么原因

Question

```java
public class Tester {

    public static void main(String[] args) {
       SimCard a=new SimCard("12345678901");
       SimCard b=new SimCard("12345678902");
       Battery c=new Battery(2000);
       Battery d=new Battery(3000);
       Cellphone f=new Cellphone(a,b,2000);
       System.out.println("card1's number"+a.getNumber());
       System.out.println("card2's number"+b.getNumber());
       System.out.println("card1's capacity"+c.getCapacity());
       System.out.println("card2's capacity"+d.getCapacity());
       Cellphone n=new Cellphone(a,b,3000);
       System.out.println(n.getBatteryCapacity());
        System.out.println("Hello World!");
    }
}
class SimCard{
    private String number;
    public String getNumber(){
        return number;
    }
    public SimCard(String a){
        number=a;
    }
}
class Battery{
    private int capacity=0;
    public int getCapacity(){
        return capacity;
    }
    public Battery(int a){
        capacity=a;
    }
}
class CellPhone{
    private SimCard card1,card2;
    private Battery battery;
    CellPhone(SimCard c1,SimCard c2,Battery bt){
        card1=c1;
        card2=c2;
        battery=bt;
    }
    
    CellPhone(SimCard c1,Battery bt){
        card1=c1;
        battery=bt;
    }
    public void setCard1(SimCard c){
        card1=c;
    }
    public void setCard2(SimCard c){
        card2=c;
    }
    public SimCard getCard1Number(){
        return card1;
    }
    public SimCard getCard2Number(){
        return card2;
    }
    public void setBattery(Battery bt){
        battery=bt;
    }
    public Battery getBattreyCapacity(){
        return battery;
    }
}

```报错如下：Exception in thread "main" java.lang.RuntimeException: Uncompilable code - 找不到符号
符号: 类 Cellphone
位置: 类 com.mycompany.tester.Tester
at com.mycompany.tester.Tester.main(Tester.java:1)
Command execution failed.

Answer 1

 
class SimCard{
    private String number;
    public String getNumber(){
        return number;
    }
    public SimCard(String a){
        number=a;
    }
}
class Battery{
    private int capacity=0;
    public int getCapacity(){
        return capacity;
    }
    public Battery(int a){
        capacity=a;
    }
}
class CellPhone{
    private SimCard card1,card2;
    private Battery battery;
    CellPhone(SimCard c1,SimCard c2,Battery bt){
        card1=c1;
        card2=c2;
        battery=bt;
    }
    
    CellPhone(SimCard c1,Battery bt){
        card1=c1;
        battery=bt;
    }
    public void setCard1(SimCard c){
        card1=c;
    }
    public void setCard2(SimCard c){
        card2=c;
    }
    public SimCard getCard1Number(){
        return card1;
    }
    public SimCard getCard2Number(){
        return card2;
    }
    public void setBattery(Battery bt){
        battery=bt;
    }
    public Battery getBattreyCapacity(){
        return battery;
    }
}
public class Tester {
    public static void main(String[] args) {
       SimCard a=new SimCard("12345678901");
       SimCard b=new SimCard("12345678902");
       Battery c=new Battery(2000);
       Battery d=new Battery(3000);
       CellPhone f=new CellPhone(a,b,c);
       System.out.println("card1's number"+a.getNumber());
       System.out.println("card2's number"+b.getNumber());
       System.out.println("card1's capacity"+c.getCapacity());
       System.out.println("card2's capacity"+d.getCapacity());
       CellPhone n=new CellPhone(a,b,d);
       System.out.println(n.getBattreyCapacity());
       System.out.println("Hello World!");
    }
}