异常处理2

package exception;



public class Bank {
    
    double balance;
    
    Bank(double cunkuan)
    {
        this.balance+=cunkuan;
        System.out.println("您存了"+cunkuan+"元，当前余额为："+this.balance);
    }
    
    void withDrawal(double dAmount) throws Exception
    {
        
        if(dAmount>this.balance)
        {
            throw new InsufficientFundsException();
        }
        
        if(dAmount<0)
        {
            throw new NagativeFundsException();
        }
        this.balance-=dAmount;
        System.out.println("您取了"+dAmount+"元，当前余额为："+this.balance);
    }
    
    public static void main(String args[]) 
    {
        Bank bb=new Bank(100);
        
        
            try {
                bb.withDrawal(23);
            } catch (Exception e1) {
                // TODO 自动生成的 catch 块
                e1.printStackTrace();
            }
        
        //取款金额为负
            try {
                bb.withDrawal(-6);
            } catch (Exception e) {
                // TODO 自动生成的 catch 块
                e.printStackTrace();
            }
            
        //取款金额大于存款
        
            try {
                bb.withDrawal(150);
            } catch (Exception e) {
                // TODO 自动生成的 catch 块
                e.printStackTrace();
            }
                
            
        
            
    }
    
    
    

}

package exception;

public class InsufficientFundsException extends Exception {

    @Override
    public String getMessage() {
        // TODO 自动生成的方法存根
        return "余额不足";
    }

    
    
}

package exception;

public class NagativeFundsException extends Exception {

    @Override
    public String getMessage() {
        // TODO 自动生成的方法存根
        return "取款额不能为负";
    }

    
    
    
}