java语言与面向对象程序设计书上实验

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1、P1105_6publicclassTestSuper{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{

2、doublebalance;abstractbooleanperformDial();doublegetBalance(){returnbalance;}}abstractclassNumber_PhoneCardextendsPhoneCard{longcardNumber;intpassword;StringconnectNumber;booleanconnected;booleanperformConnection(longcn,intpw){if(cn==cardNumber&&pw==password

3、){connected=true;returntrue;}elsereturnfalse;}}classD200_CardextendsNumber_PhoneCard{doubleadditoryFee;doublebalance;booleanperformDial(){if(balance>(0.5+additoryFee)){balance-=(0.5+additoryFee);returntrue;}elsereturnfalse;}doublegetBalance(){returnsuper.bal

4、ance;}}P121例5-10publicclassTestOverride{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

5、("拨打电话后剩余金额为："+my200.getBalance());}}abstractclassPhoneCard{doublebalance;abstractbooleanperformDial();doublegetBalance(){returnbalance;}}abstractclassNumber_PhoneCardextendsPhoneCard{longcardNumber;intpassword;StringconnectNumber;booleanconnected;booleanper

6、formConnection(longcn,intpw){if(cn==cardNumber&&pw==password){connected=true;returntrue;}elsereturnfalse;}}classD200_CardextendsNumber_PhoneCard{doubleadditoryFee;D200_Card(longcn,intpw,doubleb,Stringc){cardNumber=cn;password=pw;balance=b;connectNumber=c;}bo

7、oleanperformDial(){if(!connected)returnfalse;if(balance>(0.5+additoryFee)){balance-=(0.5+additoryFee);returntrue;}elsereturnfalse;}booleanperformDial(longcn,intpass){if(performConnection(cn,pass))returnperformDial();elsereturnfalse;}doublegetBalance(){if(con

8、nected)returnbalance;elsereturn-1;}}P128例5_12publicclassConstructorOverride{publicstaticvoidmain(String[]args){D200_Cardmy200=newD200_Card(12345678,1234,50.0,"200",0.1);System.out.println("my200