创建一个程序，在其中定义两个类，并使用Java的封装技术完成；

1、属性有：姓名（长度要大于等于2小于等于4）、余额（要大于20，否则提示默认余额为0）、密码（密码长度为6，否则提示抹蜜长度不符合规则，并设置默认密码为000000）

public class Test {public static void main(String[] args) {Account account = new Account("smith",18.5,"1234567");account.show();}
}
class Account{private String name;private double balance;private String pwd;public Account() {}public Account(String name, double balance, String pwd) {setBalance(balance);setName(name);setPwd(pwd);}public String getName() {return name;}public void setName(String name) {if (name.length() >= 2 && name.length() <= 4) {this.name = name;}else{System.out.println("名字长度超出范围，默认名字：张三");this.name="张三";}}public double getBalance() {return balance;}public void setBalance(double balance) {if (balance > 20) {this.balance=balance;}else {System.out.println("余额不足20元，默认余额为0");this.balance=0;}}public String getPwd() {return pwd;}public void setPwd(String pwd) {if (pwd.length() == 6) {this.pwd = pwd;}else {System.out.println("密码长度不足或超出六位，默认密码为：000000");this.pwd="000000";}}public void show(){System.out.println("姓名: "+name+" 余额: "+balance+" 密码: "+pwd);}
}