java语言程序设计题

public interface ShapeArea(){

public double area();

}

public class MyRectangle(){

public static double area(double x,double y){

return xy;

}

public class MyTriangle(){

public static double area(double x,double y,double z){

double s=x+y+z;

returnMathsqrt(s(s-x)(s-y)(s-z));

}

public class Test(){

public static void mian(String[] args){

Systemoutprintln(MyRectanglearea(5,10));

Systemoutprintln(MyTrianglearea(3,4,5));

}

}

}

下面是BankAccount类的代码：

public class BankAccount {

  private String name;

  private double balance;

  private int year;

  private double rate = 001d;

  public String getName() {

      return name;

  }

  public void setName(String name) {

      thisname = name;

  }

  public double getRate() {

      return rate;

  }

  public void setRate(double rate) {

      thisrate = rate;

  }

  public double getBalance() {

      return balance;

  }

  public BankAccount() {

      thisbalance = 10d;

      thisyear = 1;

  }

  public BankAccount(double balance, int year) {

      thisbalance = balance;

      thisyear = year;

  }

  public void save(double balance, int year) {

      thisbalance = thisbalance + balance;

      thisyear = year;

  }

  public void fetch(double balance) {

      thisbalance = thisbalance - balance;

      thisyear = 0;

  }

  public double calcTotal() {

      return thisbalance thisrate thisyear + thisbalance;

  }

}

下面是BankTest类的代码：

public class BankTest {

  public static void main(String[] args) {

      BankAccount account = new BankAccount(1000d, 3);

      accountsetName("Tom");

      accountsave(2000d, 3);

      Systemoutprintln("该账户的姓名：" + accountgetName());

      Systemoutprintln("该账户的存款额：" + accountgetBalance());

      Systemoutprintln("该账户的总金额：" + accountcalcTotal());

  }

}

下面是运行结果：

麻烦您看一下，是否能够满足要求。

class Circle

{

double radius;

double diameter;

double area;

public Circle()

{

radius=1;

}

public double getRadius() {

return radius;

}

public void setRadius(double radius) {

thisradius = radius;

}

//下面这个方法用于计算机圆的直径

public double computeDiameter()

{

return 2radius;

}

public double computeArea()

{

return MathPIradiusradius;

}

}

public class TestCircle {

public static void main(String args[])

{

Circle c1=new Circle();

Circle c2=new Circle();

Circle c3=new Circle();

c2setRadius(5);

c3setRadius(10);

Systemoutprint("第一个圆的直径为:"+c1computeDiameter());

Systemoutprintln(" 面积为:"+c1computeArea());

Systemoutprint("第二个圆的直径为:"+c2computeDiameter());

Systemoutprintln(" 面积为:"+c2computeArea());

Systemoutprint("第三个圆的直径为:"+c3computeDiameter());

Systemoutprintln(" 面积为:"+c3computeArea());

}

}

//人接口

public interface Human {

void speak();

}

//教师类

public class Teacher implements Human {

public void speak() {

Systemoutprintln("speak");

}

public void teach() {

Systemoutprintln("teach");

}

}

//学生类

public class Student implements Human {

public void speak() {

Systemoutprintln("speak");

}

public void learn() {

Systemoutprintln("learn");

}

}

//测试类

class HumanTest {

@Test

void test() {

Teacher teacher=new Teacher();

Student stu=new Student();

teacherteach();

teacherspeak();

stulearn();

stuspeak();

}

}

运行结果：

teach

speak

learn

speak

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