JML

org.jmlspecs.samples.prelimdesign
Class BankAccount

java.lang.Object
  extended byorg.jmlspecs.samples.prelimdesign.BankAccount

public class BankAccount
extends Object


Class Specifications
public invariant this.credit != null&&this.owner != null&&this.credit.greaterThanOrEqualTo(new org.jmlspecs.samples.prelimdesign.USMoney(0));
public constraint this.owner == \old(this.owner);

Specifications inherited from class Object
represents objectState <- org.jmlspecs.lang.JMLDataGroup.IT;
public represents _getClass <- \typeof(this);

Model Field Summary
 USMoney credit
           
 String owner
           
 
Model fields inherited from class java.lang.Object
_getClass, objectState, theString
 
Ghost Field Summary
 
Ghost fields inherited from class java.lang.Object
objectTimesFinalized, owner
 
Constructor Summary
BankAccount(non_null Money amt, non_null String own)
           
 
Model Method Summary
 
Model methods inherited from class java.lang.Object
hashValue
 
Method Summary
 Money balance()
           
 void deposit(non_null MoneyComparable amt)
           
 void payInterest(double rate)
           
 void withdraw(non_null MoneyComparable amt)
           
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Model Field Detail

credit

public USMoney credit
Specifications: non_null

owner

public String owner
Specifications: non_null
Constructor Detail

BankAccount

public BankAccount(non_null Money amt,
                   non_null String own)
Specifications:
public normal_behavior
requires (new org.jmlspecs.samples.prelimdesign.USMoney(1)).lessThanOrEqualTo(amt);
assignable credit, owner;
ensures this.credit.equals(amt)&&this.owner.equals(own);
Method Detail

balance

public Money balance()
Specifications: non_null
public normal_behavior
assignable \nothing;
ensures \result != null&&\result .equals(this.credit);

payInterest

public void payInterest(double rate)
Specifications:
public normal_behavior
requires 0.0 <= rate&&rate <= 1.0;
assignable credit;
ensures this.credit == \old(this.credit).scaleBy(1.0+rate);
    for_example
public normal_example
requires rate == 0.05&&this.credit.equals(new org.jmlspecs.samples.prelimdesign.USMoney(4000));
assignable credit;
ensures this.credit.equals(new org.jmlspecs.samples.prelimdesign.USMoney(4200));

deposit

public void deposit(non_null MoneyComparable amt)
Specifications:
public normal_behavior
requires amt.greaterThanOrEqualTo(new org.jmlspecs.samples.prelimdesign.USMoney(0));
assignable credit;
ensures this.credit.equals(\old(this.credit).plus(amt));
    for_example
public normal_example
requires this.credit.equals(new org.jmlspecs.samples.prelimdesign.USMoney(40000))&&amt.equals(new org.jmlspecs.samples.prelimdesign.USMoney(1));
assignable credit;
ensures this.credit.equals(new org.jmlspecs.samples.prelimdesign.USMoney(40001));

withdraw

public void withdraw(non_null MoneyComparable amt)
Specifications:
public normal_behavior
requires (new org.jmlspecs.samples.prelimdesign.USMoney(0)).lessThanOrEqualTo(amt)&&amt.lessThanOrEqualTo(this.credit);
assignable credit;
ensures this.credit.equals(\old(this.credit).minus(amt));
    for_example
public normal_example
requires this.credit.equals(new org.jmlspecs.samples.prelimdesign.USMoney(40001))&&amt.equals(new org.jmlspecs.samples.prelimdesign.USMoney(40000));
assignable credit;
ensures this.credit.equals(new org.jmlspecs.samples.prelimdesign.USMoney(1));

JML

JML is Copyright (C) 1998-2002 by Iowa State University and is distributed under the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This release depends on code from the MultiJava project and is based in part on the Kopi project Copyright (C) 1990-99 DMS Decision Management Systems Ges.m.b.H.