《第一行代码java》课后编程题(第四章)

第四章面向对象高级知识

1.定义一个ClassName接口,接口中只有一个抽象方法getClassName()。设计一个类Company,该类实现接口ClassName中的方法getClassName(),功能是获取该类的类名称。编写应用程序使用Company类。
代码如下

package www.zbq.com;

interface ClassName {
	public abstract void getClassName();
}

class Company implements ClassName {
	public void getClassName() {
		System.out.println(getClass());
	}
}

public class Test {

	public static void main(String[] args) {
		Company c = new Company();
		c.getClassName();
	}

}

2.建立一个人类(Person)和学生类(Student)功能要求:
A.Person类中包含4个保护型的数据成员name,address,sex,age分别为字符串,字符串,字符和整形。表示:姓名,地址,性别,年龄。一个四参构造方法,一个无参构造方法,及一个输出方法用于显示四种属性。
B.Student继承Person,并增加输出成母案math,english存放数学和英语成绩。一个六参构造方法,一个两参构造方法,一个无参构造方法,重写输出方法用于显示全部六种属性。
代码如下

package www.zbq.com;

class Person {
	public String name;
	public String address;
	public char sex;
	public int age;

	public Person() {

	}

	public Person(String name, String address, char sex, int age) {
			this.name=name;
			this.address=address;
			this.sex=sex;
			this.age=age;
	}

	public void print() {
		System.out.println("姓名:" + this.name + "地址:" + this.address + "性别:" + this.sex + "年龄:" + this.age);

	}
}
class Student extends Person
{
	public double math;
	public double english;
	public Student() {}
	public Student(double math,double english) 
	{
		this.math=math;
		this.english=english;
	}
	public Student(String name,String address,char sex,int age,double math,double english) 
	{
		this.name=name;
		this.address=address;
		this.sex=sex;
		this.age=age;
		this.math=math;
		this.english=english;
	}
	public void print() 
	{
		System.out.println("姓名:" + this.name + "地址:" + this.address + "性别:" + this.sex + "年龄:" + this.age+"数学成绩:"+this.math+"英语成绩:"+this.english);
	}
}

3.定义员工类,具有姓名,年龄,性别属性,并具有构造方法,显示数据方法,定义管理层类,继承员工类,并有自己的属性:职务,年薪。丁一志愿类,继承员工类,并有自己的属性:所属部门,月薪。
代码如下:

class Employee {
	public String name;
	public int age;
	public String sex;

	public void Employee(String name, int age, String sex) {
		this.name = name;
		this.age = age;
		this.sex = sex;
	}

	public void print() {
		System.out.println("姓名:" + this.name + "年龄:" + this.age + "性别:" + this.sex);
	}
}

class Management extends Employee {
	private String duty;
	private int AnnualSalary;

	public void Management(String duty, int AnnualSalary) {
		this.duty = duty;
		this.AnnualSalary = AnnualSalary;
	}

	public void print() {
		System.out.println("姓名:" + this.name + "年龄:" + this.age + "性别:" + this.sex + "职务:" + this.duty + "年薪:"
				+ this.AnnualSalary);
	}
}

class OfficeCleck extends Employee {
	private String department;
	private int MonthlySalary;

	public void OfficeCleck(String department, int MonthlySalary) {
		this.department = department;
		this.MonthlySalary = MonthlySalary;
	}

	public void print() {
		System.out.println("姓名:" + this.name + "年龄:" + this.age + "性别:" + this.sex + "部门:" + this.department + "月薪:"
				+ this.MonthlySalary);
	}
}

public class Test {
	public static void main(String[] args) throws Exception{
		Management management = new Management();
		management.Employee("张三", 26, "男");
		management.Management("项目经理", 300000);
		OfficeCleck officecleck = new OfficeCleck();
		officecleck.Employee("李四", 18, "男");
		officecleck.OfficeCleck("项目部", 10000);
		management.print();
		officecleck.print();
	}
}

定义类Shape表示一般二维图形。Shape具有抽象方法area和perimeter,分别计算形状的面积和周长。试定义一些二维形状类(如矩形,三角形,圆形等),这些类均为Shape类的子类。

abstract class Shape {
	abstract void area();

	abstract void perimeter();
}

class Roundness extends Shape {
	public double radius;

	public Roundness(double radius) {
		this.radius = radius;
	}

	public void area() {
		System.out.println("半径为" + this.radius + "厘米的圆,面积为" + (radius * radius * 3.14));
	}

	public void perimeter() {
		System.out.println("半径为" + this.radius + "厘米的圆,周长为" + (radius * 2 * 3.14));
	}
}

class Rectangle extends Shape {
	public double height;
	public double width;

	public Rectangle(double height, double width) {
		this.height = height;
		this.width = width;
	}

	public void area() {
		System.out.println("高为" + this.height + "宽为" + this.width + "的矩形,面积为" + (this.height * this.width));
	}

	public void perimeter() {
		System.out.println("高为" + this.height + "宽为" + this.width + "的矩形,周长为" + ((this.height + this.width) * 2));
	}
}

public class Test {
	public static void main(String[] args) {
		Roundness roundness = new Roundness(3.5);
		roundness.area();
		roundness.perimeter();
		Rectangle rectangle = new Rectangle(5, 6);
		rectangle.area();
		rectangle.perimeter();
	}
}

因为时间原因,所以只写了圆形的和矩形的,其余的都可以以此类推,以上所有的问题,如果有什么错误,或者有更优解,欢迎各位联系我,感谢各位的阅读。

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