Java

Front 1

When is a constructor called and what does it do? Give an example of some Java code that invokes a constructor.

Back 1

A constructor is something like keyboardreader = new keyboard reader(). What instantiates (creates) a new object and puts it in memory. () is called the default constructor. Instantiate and having an example already in your mind is a good idea.

Front 2

What is the function of the static modifier? Give an example of when it may be used.

Back 2

2. The function of the static modifier. (anything static is loaded into memory) Things that are static are variables and methods. A variable can be static and a method can be a static. We call static objects a class member o ra class member. Anything that is not static is called a instance method or a instance variable. A class member that we reference by a class is: “max.round” or the main method.

Front 3

What is a narrowing conversion? Under what circumstances can a narrowing conversion take place?

Back 3

Narrowing conversion is: when does java moan at you about narrowing or widening conversion. You can loose precision when you assign a double to an integer. This is when you take a larger variable and try to cram it into a narrower variable.

Front 4

What is the scope and lifetime of variables? Give some examples of variables that have different scope and lifetime.

Back 4

The scope and lifetime of variables are… The scope of a variable is: global, … They all have certain lifetime and certain scope

Front 5

When information is being read from file, why is it desirable to use an "initial read"?

Back 5

It is desirable to use a “initial read” because

Front 6

the quick brown fox

Back 6

jumps over the lazy dog

Front 7

what is this about?

Back 7

trying out this new service.

Front 8

what do i like?

Back 8

flashcard exchange.

Front 9

how do we finish

Back 9

i am not sure yet