【正文】 olean bijiao(Complex c1){return(==amp。amp。==)。} public String toString(){return +”+“++”i“。} } public class ComplexText { public static void main(String[] args){Complex c1=new Complex(2,5)。//創(chuàng)建類(lèi)，調(diào)用類(lèi)里面的方法Complex c2=new Complex(5,2)。Complex c3=new Complex()。((c1,c2))。((c1,c2))。((c1,c2))。} }（3）public class Calculate { double i,j, t。public Calculate(int i,int j){=i。=j。} public Calculate(int i,int j,int t){=i。=j。=t。} public double add(){return i+j。} public double jian(){return ij。} public double cheng(){return i*j。} public double chu(){return i/j。} public double tiji(){return i*i*i+j*j*j+t*t*t。} } public class PackageDemo {//測(cè)試public static void main(String[] args){Calculate c1=new Calculate(8,4)。Calculate c2=new Calculate(8,4,2)。(”相加=“+())。(”相減=“+())。(”相乘=“+())。(”相除 =“+())。(”立方體體積=“+())。} }（4）public class BankAccount { double balance,interest,cunkuan。public BankAccount(double cunkuan,double balance)//寫(xiě)方法{=balance。=cunkuan。} public void set(double cunkuan){if(cunkuanelse if(cunkuanelse if(cunkuanelse interest=。} public double get(){ return interest。} public void chaxun(double balance,double cunkuan){(”存款為：“+cunkuan)。(”余額為：“+balance)。} public void qu(double qukuan){(”取款為：“+qukuan)。(”得到的利潤(rùn)率：“+()*)。} } public class UseAccount {//測(cè)試public static void main(String[] args){BankAccount c1=new BankAccount(40000,40000)。(40000,20000)。(20000)。(”利率為“+())。(10000)。} }（5）public class Student { String name。int age。float average,chainese。float math,Enghish。public Student(String name,int age){=name。=age。(name+”:“+age+”歲“+” “)。} public void set(float chinese,float math,float Enghish){average=(chinese+math+Enghish)/3。} public float get(){return average。} }class Undergraduate extends Student// Student繼承Undergraduate {public Undergraduate(String name,int age){ super(name,age)。}public void hege(float average){=average。if(average=60)(”本科生成績(jī)合格“)。else (”本科生成績(jī)不合格“)。}}class Graduate extends Student// Student繼承Graduate {public Graduate(String name,int age){ super(name,age)。//調(diào)用} public void hege(float average){ =average。if(average=80)(”研究生生成績(jī)合格“)。else (”研究生成績(jī)不合格“)。} } public class StudentDemo {//測(cè)試public static void main(String[] args){Undergraduate c1=new Undergraduate(”小明 “,22)。(”本科生三門(mén)成績(jī)分別為：“+”59,“+”85,“+”90“)。(65,75,60)。(”本科生平均分=“+())。(())。()。Graduate c2=new Graduate(”小紅 “,18)。(”研究生生三門(mén)成績(jī)分別為“+”90,“+”84,“+”88“)。(80,86,79)。(”研究生生平均分=“+())。(())。}(6)public abstract class ClosedFigure {//定義抽象類(lèi)String shape。public ClosedFigure(String newShape){=newShape。} public abstract double perimeter()。//定義抽象類(lèi)，里面不能寫(xiě)方法public abstract double area()。} public class Triangle extends ClosedFigure {// ClosedFigure繼承Triangle double a,b,c。public Triangle(String newShape,double a,double b,double c){super(”newShape“)。=a。=b。=c。} public double perimeter(){return a+b+c。} public double area(){double s。s=(a+b+c)/2。return (s*(sa)*(sb)*(sc))。} public String toString(){return(”三角形三邊長(zhǎng)：“+a+” “+b+” “+c+” “+”周長(zhǎng)：“+perimeter()+”面積:“+area())。} public class Test { public static void main(String[] args){Triangle c1=new Triangle(”三角形“,3,4,5)。()。()。(())。} } }（7）public abstract class Employee { private String firstName。private String lastName。public Employee(String first,String last){firstName=first。lastName=last。} public String getEmployeeName(){return firstName。} public String getLastName(){ return lastName。} public String toString(){return firstName+lastName。} public abstract String earnings()。} public final class Boss extends Employee{ double salary。public Boss(String first, String last, double salary){ super(first, last)。 = salary。} public String earnings(){return(salary+”“)。} } public final class CommissionWorker extends Employee { double salary。double sale。double price。public CommissionWorker(String first, String last, double salary, double sale,double price){super(first, last)。 = salary。 = sale。 = price。} public String earnings(){return(salary+sale*price+”“)。} } public final class PieceWorker extends Employee{double number。double price。public PieceWorker(String first, String last, double number,double price){super(first, last)。 = number。=price。}public String earnings(){return(number*price+”“)。}} public final class HourlyWorker extends Employee {double time。double money。public HourlyWorker(String first, String last, double time, double money){ super(first, last)。 = time。 = money。} public String earnings(){ return(time*money+”“)。} } public class Test { public static void main(String[] args){Employee c1=new Boss(”張“,”三“,10000)。(”張三月工資：“+())。Employee c2=new CommissionWorker(”李“,”四“,4000,1500,2)。(”李四月工資：“+())。Employee c3=new PieceWorker(”王“,”五“,1000,3)。(”王五月工資：“+())。Employee c4=new HourlyWorker(”劉“,”三“,600,30)。(”劉三月工資：“+())。} }（8）public class Circle { String shape。double r。double height。double pi。public Circle(String shape,double r,double height,double pi){=shape。=height。=r。=pi。} } public interface Volume { public abstract double area()。public abstract double NewVolume()。} public class Yuanzhu extends Circle implements Volume { public Yuanzhu(String shape, double r, double height, double pi){ super(shape, r, height, pi)。} public double area(){ return pi*r*r。} public double NewVolume(){return area()*height。} } public class Yuanzhui extends Yuanzhu implements Volume { public Yuanzhui(String shape, double r, double height, double pi){super(shape, r, height, pi)。// TODO Autogenerated constructor stub } double s。public double area(){s=(height*height+r*r)。return pi*r*s+pi*r*r。} public double NewVolum(){return *pi*r*pi*r*height。} } public class Test { public static void main(String[] args){Yuanzhu c1=new Yuanzhu(”圓柱“,4,6,)。Yuanzhui c2=new Yuanzhui(”圓錐“,2,3,)。(”圓柱表面積：“+())。(”圓柱體積：“+())。(”圓錐表面積：“+())。(”圓錐體積：“+())。} }(9)public interface CanFly {//定義接口CanFly public void fly()。} public class Plane implements CanFly{//使用接口 @Override public void fly(){// TODO Autogenerated method stub(”飛機(jī)借助螺旋槳飛上天空“)。}