摘自《java 2 實用教程》 java自定義異常類
阿新 • • 發佈:2019-01-04
class BankException extends Exception { String message; public BankException(int m, int n) { message = "入賬資金" + m + "是負數或者支出" + n + "是正數,不符合系統要求。"; } public String warnMessage() { return message; } } class Bank { private int money; public void income(int in, int out) throws BankException { if (in <= 0 || out >= 0 || in + out <= 0) { throw new BankException(in, out);// 方法丟擲異常,導致方法結束 } int netIcome = in + out; System.out.println("本次計算出的純收入是:" + netIcome + "元。"); money = money + netIcome; } public int getMoney() { return money; }; } public class Lmt02 { public static void main(String[] args) { Bank bank = new Bank(); try { bank.income(200, -100); bank.income(300, -100); bank.income(400, -100); System.out.println("銀行目前有" + bank.getMoney() + "元。"); bank.income(200, 100); bank.income(999999, -99); } catch (BankException e) { System.out.println("計算收益的過程中出現如下問題:"); System.out.println(e.warnMessage()); } System.out.println("銀行目前有" + bank.getMoney() + "元。"); } }