作业

class Employer{
private String name;
private int age;
private char sex;
public Employer(){
}
public Employer(String name,int age,char sex){
super();
this.name=name;
this.age=age;
this.sex=sex;
}
public String toString(){
return "雇员姓名："+this.name+" 年龄："+this.age+
" 性别："+this.sex;
}
}
class Manager extends Employer{
private String job;
private double income;
public Manager(){
}
public Manager(String name,int age,char sex,String job,double income){
super(name,age,sex);
this.job=job;
this.income=income;
}
public String toString(){
return super.toString()+" 职位："+this.job+" 年薪："+this.income;
}
}
class Staff extends Employer{
private String dept;
private double salary;
public Staff(){
}
public Staff(String name,int age,char sex,String dept,double salary){
super(name,age,sex);
this.dept=dept;
this.salary=salary;
}
public String toString(){
return super.toString()+" 部门："+this.dept+" 月薪："+this.salary;
}
}
public class per03 {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Employer ea=new Manager("小刘",22,'男',"经理",100000.0);
Employer eb=new Staff("小崔",23,'男',"销售",3000.0);
System.out.println(ea);
System.out.println(eb);
}
}

abstract class Shape{
public abstract double area();
public abstract double perimeter();
}
class Rectangle extends Shape{
private double wide;
private double longs;
public Rectangle(){
}
public Rectangle(double wide,double longs){
super();
this.wide=wide;
this.longs=longs;
}
public double area(){
return this.longs*this.wide;
}
public double perimeter(){
return (this.longs +this.wide)*2;
}
}
class Triangle extends Shape{
private double edgea;
private double edgeb;
private double edgec;
public Triangle(){
}
public Triangle(double edgea,double edgeb,double edgec){
super();
this.edgea=edgea;
this.edgeb=edgeb;
this.edgec=edgec;
}
public double area(){
return this.edgea*this.edgeb/2;
}
public double perimeter(){
return this.edgea+this.edgeb+this.edgec;
}
}
class Round extends Shape{
private double radius;
public Round(){
}
public Round(double radius){
super();
this.radius=radius;
}
public double area(){
return this.radius*this.radius*Math.PI;
}
public double preimeter(){
return this.radius*2*Math.PI;
}
@Override
public double perimeter() {
// TODO Auto-generated method stub
return 0;
}
}
public class per04 {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Shape rectangle=new Rectangle(12.5,30.6);
Shape triangle=new Triangle(12.4,30.2,40.3);
Shape round=new Round(40.4);
System.out.println("矩形面积："+rectangle.area()+" 矩形周长："+rectangle.perimeter());
System.out.println("三角形面积："+triangle.area()+" 三角形周长："+triangle.perimeter());
System.out.println("圆形面积："+round.area()+" 圆形周长："+round.perimeter());
}

}