使用 class定义类别 在Java中使用"cass"尖键词来定乂类另 public class Account i 定义类别 private string accountNumberi privatedouble balance i public Account)t 定义建构方法 this(" empty",0.0)氵 public Account(string accountNumber, double balance) this accountNumber accountNumber this balance balance使用class定义类别 • 在Java中使用"class"关键词来定义类别 public class Account { private String accountNumber; privatedouble balance; public Account(){ this("empty", 0.0); } public Account(String accountNumber, double balance) { this.accountNumber = accountNumber; this.balance = balance; } … 定义类别 定义建构方法