一道关于java异常处理的题目

1、建立exception包,编写testexception.java程序，主方法中有以下代码，确定其中可能出现的异常，进行捕获处理。

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;
}
}
}
}

2、建立exception包，建立bank类，类中有变量double balance表示存款,bank类的构造方法能增加存款，bank类中有取款的发方法withdrawal(double damount),当取款的数额大于存款时,抛出insufficientfundsexception,取款数额为负数，抛出nagativefundsexception,如new bank(100),表示存入银行100元，当用方法withdrawal(150)，withdrawal(-15)时会抛出自定义异常。

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();
}
} 
}

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