4.15 JAVA

Interface classname{
String GetClassName ();
}


Class Company implements Classname{
Public String GetClassName () {
Return "Company";
}
}

public class test6_1{
public static void Main (string[] args) {
System.out.println (new company (). GetClassName ());
}
}

Abstract class employee{
private String name;
private int age;
Private String sex;

Public Employee () {}
Public Employee (String name,int age,string sex) {
This.setname (name);
This.setage (age);
This.setsex (Sex);
}

public void SetName (String name) {
THIS.name = name;
}
public void Setage (int.) {
This.age = age;
}
public void Setsex (String sex) {
This.sex = sex;
}

Public String GetInfo () {
Return "name =" +this.name+
"; Age = "+this.age+
"; sex = "+this.sex;
}
public abstract void print ();
}

Class Managemen extends employee{
private String position;
private int annualpay;

Public Managemen () {}
Public Managemen (String name,int age,string sex) {
Super (Name,age,sex);
}
Public Managemen (String name,int age,string sex,string position,int annualpay) {
Super (Name,age,sex);
This.setposition (position);
This.setannualpay (Annualpay);
}

public void SetPosition (String position) {
This.position = position;
}
public void Setannualpay (int annualpay) {
This.annualpay = Annualpay;
}

Public String GetInfo () {
return Super.getinfo () +
"; Position = "+this.position+
"; Annualpay = "+this.annualpay;
}
public void print () {
System.out.println (This.getinfo ());
}
}

public class test6_4{
public static void Main (string[] aegs) {
Managemen MGM = new Managemen ("Zjx", "Man", "Boss", 10000000);
Mgm.print ();
}
}

Public interface Shape {

Public double area ();
public double perimeter ();
}

public class Circle implements Shape {
Double r = 5;
Double pi = 3.14;

Public double Area () {
return pi*r*r;
}

Public double perimeter () {
return 2*pi*r;
}

}

public class Rectangle implements Shape {
Double A = 3;
Double b = 4;

Public double area () {
return a*b;
}

Public double perimeter () {
return (A+B);
}

}

public class Triangle implements Shape {
Double A = 4;

Public double area () {
return a*a;
}

Public double perimeter () {
return 4*a;
}

}
public class Test6_5 {

public static void Main (string[] args) {
Shape S1 = new Circle ();
System.out.println (S1.area ());
System.out.println (S1.perimeter ());

Shape s2 = new Rectangle ();
System.out.println (S2.area ());
System.out.println (S2.perimeter ());

Shape s3 = new Triangle ();
System.out.println (S3.area ());
System.out.println (S3.perimeter ());
}

}

4.15 JAVA