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java异常处理——题

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;            }        }    }}

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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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java异常处理——题