Java Programming - Lecture 4

This lecture finishes the object concept and starts to explain the concept of inheritance. A simple inheritance example is given.

[ShivJalli]

Awesome lectures with supporting materials, much appreciated, Thanks Very Much

[mlabouardy]

I think there is a simple way to implement compare method
public int compare(Temperarute t1, Temperature t2){
float value1=t1.getTempC();
float value2=t2.getTempC();
if(value1==value2) return 0;
else if(value1>value2)return 1;
else return -1;
}

[RicochetRita]

1:19:00 Downcasting is certainly allowed in java, although many consider it to not be a best practice, when the base (parent) class has value of a derived (child) class: 
Parent par = new Child(); // UPCAST
Child ch = (Child) par;   // DOWNCAST

[lazybuddies]

Hi Barbara have quite a few doubts about synchronized keyword in java. Could you please clear this doubt by explaining an eample???

[corydavis]

I'm confused, if she hasn't taught if statements and operators, how does she expect the class to know how to finish the assignment?

[christophermock]

Wouldn't the name variable inside the Dino class be n rather than dname to match the name variable in Tetra?

[DerMagnar]

i dont see the nececitty for static methods in this assignment. Why not just use  (non-static)methods through the objects we create?
for instance: my convert method looks like this: 

void compareT (Temperature a, Temperature b){
             if(a.scale == b.scale){
                     System.out.println("same scales");
                     if (a.degrees > b.degrees){
                             System.out.println("a is higher");
                       } else System.out.println("a is lower");
                }

             if(a.scale != b.scale ){
                    System.out.println("different scales");
                    convertT(b);
                    if (a.degrees > b.degrees){
                         System.out.println("a is higher");
                     } else System.out.println("a is lower");
               }
    }

There i have my 2 temperature objects passed as parameters.

when i use this method in my main, it doesnt matter through which instance i used the method:
one.compareT(one, two);
two.compareT(one, two);
three.compareT(one. two);
its all the same.. one and two being compared.

[jamespsims]

Hello.

    If we are using the basic wrapper model (bean) you should override int compareTo(Object obj), boolean equals(Object obj), String toString().