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。
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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。
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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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原文链接:http://www.cnblogs.com/jingzhenhua/p/5902377.html