我是JAVA新人，还没怎么入门，有个题目是 创建银行账户类。银行账户类包括账号、用户姓名、密码和余额属性，银行账户类的功能包括开户、查询余额、取款、存款。
拜托大家教我写下。。。 感觉无从下手！
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- Java code
public class BankAccount { private String account; private String pwd; private double restNum; private String userName; public BankAccount(String account, String pwd, double restNum, String userName) { this.account = account; this.pwd = pwd; this.restNum = restNum; this.userName = userName; } //取 public void getMondey(double num) { restNum -= num; } //存 public void putMoney(double num) { restNum += num; } public double getRestNum() { return restNum; } public void setRestNum(double restNum) { this.restNum = restNum; }}