缺省的构造方法例 class BankAccount( String ownerName 输出结果为 Int accountNumber ownerName=null float balance; accountNumber=0 balance=0.0 public class BankTester( public static void main我们可以在调用缺省的构造函数之后直接 Bank Account m对其状态进行初始化, System. out. print/ Bank Account my Account System. out. print! my Account=new BankAccountO my Account. accountNy my Account owner Name="Wangli System. out. print! my Account. accountNumber=1000234 my Account balance=2000.00f,缺省的构造方法例 class BankAccount{ String ownerName; int accountNumber; float balance; } public class BankTester{ public static void main(String args[]){ BankAccount myAccount = new BankAccount(); System.out.println("ownerName=" + myAccount.ownerName); System.out.println("accountNumber=" + myAccount.accountNumber); System.out.println("balance=" + myAccount.balance); } } 输出结果为： ownerName=null accountNumber=0 balance=0.0 我们可以在调用缺省的构造函数之后直接 对其状态进行初始化， BankAccount myAccount; myAccount = new BankAccount(); myAccount.ownerName = “Wangli" ; myAccount.accountNumber = 1000234; myAccount.balance = 2000.00f;