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();
}
}
}