java实验报告9.doc

接口类1. 编写一个类，要求该类实现一个接口，该接口有3个abstract方法：Public abstract void f( int x);Public abstract double g(double x);Public abstract double h(double x); 要求在应用程序主类中使用该类创建对象，并使用接口回调调用方法f()、g()和h()。（1） 源程序：interface Apublic abstract void f(int x);public abstract void g(int x,int y);public abstract double h(double x);class A1 implements Apublic void f(int x)System.out.println(x);public void g(int x,int y)int z=x+y;System.out.println(z);public double h(double x)return x*x;class A2 implements Apublic void f(int x)System.out.println(Hello:+x);public void g(int x,int y)int z=x-y;System.out.println(z);public double h(double x)return Math.sqrt(x);class A3 implements Apublic void f(int x)System.out.println(你好：+x);public void g(int x,int y)double z=(double)x/y;System.out.println(z);public double h(double x)return 1/x;public class ZuoYe5_3public static void main(String args)A a=new A1();a.f(10);a.g(12,20);System.out.println(a.h(100);a=new A2();a.f(10);a.g(12,20);System.out.println(a.h(100);a=new A3();a.f(10);a.g(12,20);System.out.println(a.h(100);2. 设计一个人员类（Person），其中包含一个方法pay，代表人员的工资支出。再从Person类派生出助教类（Assistant）、讲师类（Instructor）、副教授类（Assistant Professor）和教授类（Professor）。其中：工资支出=基本工资+授课时数*每课时兼课金。 但助教基本工资为800，每课时兼课金25，讲师基本工资为1000，每课时兼课金35，副教授基本工资为1200，每课时兼课金40，教授基本工资为1400，每课时兼课金50。 将Person定义为接口，设计程序实现多态性。（1） 源程序：class Personprotected String name;protected double classsum;public Person()=;classsum=0;public Person(String name,double classsum)=name;this.classsum=classsum;class Assistant extends Person implements PersonPaypublic Assistant(String name,double classsum)super(name,classsum);public double pay()return 800+classsum*25;public String toString()return姓名：++t工资支出：+this.pay()+n;class Instructor extends Person implements PersonPaypublic Instructor(String name,double classsum)super(name,classsum);public double pay()return 1000+classsum*35;public String toString()return姓名：++t工资支出：+this.pay()+n;class AssistantProfesson extends Person implements PersonPaypublic AssistantProfesson(String name,double classsum)super(name,classsum);public double pay()return 1200+classsum*40;public String toString()return姓名：++t工资支出：+this.pay()+n;class Professor extends Person implements PersonPaypublic Professor(String name,double classsum)super(name,classsum);public double pay()return 1400+classsum*50;public String toString()return姓名：++t工资支出：+this.pay()+n;public class Sy9_2public static void main(String args)Person ps=new Person4;ps0=new Assistant(张三,120);ps1=new Instructor(赵二,130);ps2=new AssistantProfesson(李四,125);ps3=new Professor(王五,134);String output=;for(int i=0;ips.length;i+)output+=psi;System.out.println(output);3. 定义一个接口Bank，它包含有oneyearRate（一年定期利率）、oneyearNationaldebt（一年国债利率）和interestRate（活期利率）常数和count()方法及show()方法。Count()方法计算存款一年所得利息及缴利息税后的总金额（存款本金税后利息），而show()方法用显示总金额。 由于对不同的存款方式，利率是不同的，程序分别定义多个接口的实现，实现对利率的计算和显示。注：除国债外，定期存款和活期利息都要交纳20%的个人所得税。interface Bankfloat oneyearRate=0.0178f;float oneyearNationaldebt=0.0198f;float interestRate=0.0078f;abstract void count();abstract void show();class InterestRateCalcute implements Bankprivate float saving;private double sum;InterestRateCalcute(float i) saving=i;count();public void count()sum=saving+(saving*BerestRate*0.8);public void show()System.out.println(With current interest rate,sum=+sum);class OneyearNationaldebtCalcute implements Bankprivate float saving;private double sum;OneyearNationaldebtCalcute(float i) saving=i;count();public void count()sum=saving+(saving*Bank.oneyearNationaldebt);public void show()System.out.println(With national debt rate,sum=+sum);class OneyearRateCalcute implements Bankprivate float saving;private double sum;OneyearRateCalcute(float i) saving=i;count();public void count()sum=saving+(saving*Bank.oneyearRate*0.8);public void show()System.out.println(With fixed rate,sum=+sum);class Calculatepublic static void main(String args)int mon=10000;OneyearRateCa