Happy Birthday Ringtone

Help me in this java question?

Given this MobilePhone class diagram, write out the class in JAVA.

// Save the following class as MobilePhone.java

public class MobilePhone{

private String brand;
private String model;
private String ringTone;

//Constructor with business logic (codings)
public MobilePhone(String brand, String model, String ringTone){
this.brand=brand;
this.model=model;
this.ringTone=ringTone;
}

//Default consturctor
public MobilePhone(){
this(null,null,”Happy Birthday”);
}

//Another overloaded version of the consturctor
public MobilePhone(String brand){
this(brand,null,null);
}

//Another overloaded version of the consturctor
public MobilePhone(String brand, String model){
this(brand,model,null);
}

//Method to set the ringtone
public void setRingTone(String rt){
this.ringTone=ringTone;
}

//Method to print the details on the output stream (i.e.: console)
public void viewDetails(){
System.out.println(“Brand: “+brand);
System.out.println(“Model: “+brand);
System.out.println(“Ring Tone: “+brand);
}

}

//Use the following program to test the above code:

class MobileDemo{
public static void main(String args[]){
MobilePhone p1=new MobilePhone();
MobilePhone p2=new MobilePhone(“Nokia”);
MobilePhone p3=new MobilePhone(“Motorola”, “C155″);
MobilePhone p4=new MobilePhone(“Samsung”, “X640″, “Hello is it me”);

p1.viewDetails(); System.out.println();
p2.viewDetails(); System.out.println();
p3.viewDetails(); System.out.println();
p4.viewDetails(); System.out.println();
}
}

Happy Birthday Song

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