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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。
package exception; public class Bank { private double balance; public Bank (double balance) { super(); this.balance = balance; } public 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 t=new Bank (100); try{ t.withDrawal(110); }catch(Exception e){ e.printStackTrace(); } try{ t.withDrawal(-100); }catch(Exception e){ e.printStackTrace(); } } }
package exception; public class NagativeFundsException extends Exception { public String getMessage() { return "取款不能为负数"; } }
package exception; public class InsufficientFundsException extends Exception { public String getMessage() { return "余额不足"; } }
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原文地址：http://www.cnblogs.com/chouji717/p/5915088.html
