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JAVA语言与面向对象程序设计书上实验.doc

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P1105_6 publicclassTestSuper { publicstaticvoidmain(String[]args) { D200_Cardmy200=newD200_Card(); my200.balance=50.0; System.out.println("父类被隐藏的金额为："+my200.getBalance()); if(my200.performDial()) System.out.println("子类的剩余金额为："+my200.balance); } } abstractclassPhoneCard { doublebalance; abstractbooleanperformDial(); doublegetBalance() { returnbalance; } } abstractclassNumber_PhoneCardextendsPhoneCard { longcardNumber; intpassword; StringconnectNumber; booleanconnected; booleanperformConnection(longcn,intpw) { if(cn==cardNumber&&pw==password) { connected=true; returntrue; } else returnfalse; } } classD200_CardextendsNumber_PhoneCard { doubleadditoryFee; doublebalance; booleanperformDial() { if(balance>(0.5+additoryFee)) { balance-=(0.5+additoryFee); returntrue; } else returnfalse; } doublegetBalance() { returnsuper.balance; } } P121例5-10 publicclassTestOverride { publicstaticvoidmain(String[]args) { D200_Cardmy200=newD200_Card(12345678,1234,50.0,"200"); if(my200.performDial(1245678,1234)) System.out.println("拨打电话后剩余金额为："+my200.getBalance()); if(my200.performDial()) System.out.println("拨打电话后剩余金额为："+my200.getBalance()); } } abstractclassPhoneCard { doublebalance; abstractbooleanperformDial(); doublegetBalance() { returnbalance; } } abstractclassNumber_PhoneCardextendsPhoneCard { longcardNumber; intpassword; StringconnectNumber; booleanconnected; booleanperformConnection(longcn,intpw) { if(cn==cardNumber&&pw==password) { connected=true; returntrue; } else returnfalse; } } classD200_CardextendsNumber_PhoneCard { doubleadditoryFee; D200_Card(longcn,intpw,doubleb,Stringc) { cardNumber=cn; password=pw; balance=b; connectNumber=c; } booleanperformDial() { if(!connected) returnfalse; if(balance>(0.5+additoryFee)) { balance-=(0.5+additoryFee); returntrue; } else returnfalse; } boole