java异常处理——题

public class YiChang {
    public static void main(String[] args){
        for(int i=0;i<4;i++){
            int  k;
            switch(i){
                case 0: int zero=0;    
                try{
                    k=911/zero;
                }catch(ArithmeticException e){
                    System.out.println("出现算数异常！");
                }
                break;
                case 1: 
                    try{
                        int  b[]=null;
                        k = b[0];
                    }catch(NullPointerException e){
                        System.out.println("出现空指针异常！");
                    }
                    break;
                case 2:
                    int c[]=new int[2];
                    try{
                        k=c[9];
                    }catch(ArrayIndexOutOfBoundsException e){
                        System.out.println("出现数组序号溢出！");
                    }
                    break;
                case 3:
                    try{
                        char  ch="abc".charAt(99);
                    }catch(StringIndexOutOfBoundsException e){
                        System.out.println("出现数据类型转换异常！");
                    }
                    break;
            }
        }
    }
}

public class InsufficientFundsException extends Exception {
    public String getMessage(){
        return "您的余额不足！";
    }
}

public class NagativeFundsException extends Exception{
    public String getMessage(){
        return "取款金额不能为负数！";
    }
}

public class Bank {
    private static double balance;
    Bank(){
        
    };
    Bank(double balance){
        this.balance=balance;
    }
    public static void withDrawal(double dAmount) throws InsufficientFundsException,NagativeFundsException{
        if(dAmount>balance){
            throw new InsufficientFundsException();
        }
        if(dAmount<0){
            throw new NagativeFundsException();
        }
    }
    public static void main(String[] args){
        Bank b=new Bank(100);
        System.out.println("我有"+balance+"元存款！");
        try{
            withDrawal(150);
        }catch(InsufficientFundsException | NagativeFundsException e){
            e.printStackTrace();
        }
        try{
            withDrawal(-15);
        }catch(NagativeFundsException |InsufficientFundsException e){
            e.printStackTrace();
        }
    }    
}