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。
for(inti=0;i<4;i++){
int k;
switch(i){
case 0:
int zero=0;
k=911/zero;
break;
case1:
int b[]=null;
k = b[0];
break;
case2:
int c[]=new int[2];
k=c[9];
break;
case3:
char ch="abc".charAt(99);
break;
}
}
package exception;
public class TestException
{
public static void main(String[] args)
{
try
{
for(int i=0;i<4;i++)
{
int k;
switch(i)
{
// case 0:
// int zero=0;
// k=911/zero;
// break;
// case 1:
// int b[]=null;
// k = b[0];
// break;
// case 2:
// int c[]=new int[2];
//
// k=c[9];
// break;
case 3:
char ch="abc".charAt(99);
break;
}
}
}
// catch(ArithmeticException a)
// {
// System.out.println(a.getMessage()+"被除数不能为0");
// }
// catch(NullPointerException n)
// {
// System.out.println(n.getMessage()+"空指针");
// n.printStackTrace();
// }
// catch(ArrayIndexOutOfBoundsException ar)
// {
// System.out.println(ar.getMessage()+"索引超出长度");
// ar.printStackTrace();
// }
catch(StringIndexOutOfBoundsException s)
{
System.out.println(s.getMessage()+"此处不能是字符串");
s.printStackTrace();
}
}
}
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。
package exception;
public class Bank {
double balance;//存款
public Bank(double balance) {
super();
this.balance = balance;
}
//取款
//判断然后抛出异常
public void withDrawal(double dAmount) throws InsufficientResourcesException, NagativeFundsException
{
if(dAmount < 0)
{
throw new NagativeFundsException("取款数是负的") ;
}
if(dAmount > balance)
{
throw new InsufficientResourcesException("余额不足") ;
}
balance -= dAmount ;
}
}
package exception;
public class InsufficientResourcesException extends Exception {
//接受Bank抛出的异常
public InsufficientResourcesException(String msg)
{
super(msg) ;
}
}
package exception;
public class NagativeFundsException extends Exception {
public NagativeFundsException(String msg)
{
super(msg) ;
}
}
package exception;
public class Ceshi_bank {
public static void main(String[] args) throws InsufficientResourcesException, NagativeFundsException {
// TODO 自动生成的方法存根
Bank b=new Bank(100);
b.withDrawal(150);
b.withDrawal(-15);
}
}
