初学问题：高分悬赏异常问题
有java简单实现：给客户建立一个帐户，当取钱大于余额时，就抛出异常，显示余额不足！
[解决办法]
try{
if( 取钱大于余额 )
new Exception( "余额不足! ");
}catch(Exception msg){
System.out.println(msg.getMessage());
}
[解决办法]
更标准的做法是把余额不足这个错误定义成一个MoneyNotEnoughException
public void fetchMoney(int money) throws MoneyNotEnoughException,Exception{
if ...{
throw new MoneyNotEnoughException( "余额不足! ");
}
}
外部调用fetchMoney()时用try取得错误
try{
fetchMoney(1000)
}
catch(MoneyNotEnoughException e1){
...println( "余额不足! ")
}
catch(Exception e){
e.printStackTrace();
}
[解决办法]
public class MoneyNotEnough extends Exception {
public MoneyNotEnough() {
super();
}
/**
* @param message
* @param cause
*/
public MoneyNotEnough(String message, Throwable cause) {
super(message, cause);
}
/**
* @param message
*/
public MoneyNotEnough(String message) {
super(message);
}
/**
* @param cause
*/
public MoneyNotEnough(Throwable cause) {
super(cause);
}
}
public class Account{
private long nowMoney ;
Account(){ nowMoney = 5000; }
public boolean hasEnoughMoney(long out) throws MoneyNotEnough{
if (out > this.nowMoney) throw new MoneyNotEnough( "余额不足 ");
nowMoney = nowMoney - out;
return true;
}
}
