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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