public class Permissions( A public boolean canDeposit, can Withdraw, can Close, public class BankAccount private long number, private long balance; public Permissions permissions For(Person who)t Permissions perm=new Permissions; perm can Deposit=can Deposit(who); perm can Withdraw=can Withdraw(who); perm can Close=can Close(who) return perm;Method Execution (方法的执行) • 方法被调用后，执行的结果可能有以下几种： (1) 通过return语句返回结果 (2) 执行到最后一条语句，自动结束 (3) 抛出未捕获的异常 public class Permissions{ public boolean canDeposit,canWithdraw,canClose; } public class BankAccount{ private long number; private long balance; public Permissions permissionsFor(Person who){ Permissions perm=new Permissions(); perm.canDeposit=canDeposit(who); perm.canWithdraw=canWithdraw(who); perm.canClose=canClose(who); return perm; } …… }