一道关于java异常处理的题目

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();
}
} 
}