在Java中将Dimension转换为int？

Question

absolute java noob here. I was messing with some code and wondering if there is a way to convert a Dimension value to an integer or string.

I was using this line

int i = (int) frame.getSize();

to get the size of a window but it cannot convert a dimension to int. Any help?

Answer 1

You cannot "convert" a Dimension to int , because it is something different. It is meant to store information about a rectangle.

You can calculate the area of the rectangle:

double size = frame.getSize().getHeight() * frame.getSize().getWidth();

Of cause you can also store the information as a string:

String sizeStr = frame.getSize().getHeight() +" X " + frame.getSize().getWidth();

Now you could store the Dimension (but you would need to split the string again, to get the value.

Answer 2

frame.getSize();

This is returning an Dimension object. You cannot convert and object to primitive type.

The Dimension have two attribute, height and width. You can use getter methods to access them.

double getHeight() : Returns the height of this Dimension in double precision.

double getWidth() : Returns the width of this Dimension in double precision.

The size of the Window can be calculated using Height and Width . As both are of double type, you need to store the size in double type.

Dimension dim = frame.getSize();
double size = dim.getHeight() * dim.getWidth();

Answer 3

You cannot cast an Dimension to a primitive. What you could do, however, is use the access methods, such as getHeight() and getWidth() to calculate it:

// No need to explicitly cast, Java will do that automatically
// (although it will issue a warning on lost precision)
int size = frame.getHeight() * frame.getWidth();

Answer 4

The dimension object instantiated as follows;

Dimension dim = new Dimension(100, 50);

That means, there are two factors, which you should think of, these are height and weight.

If you simply say,

int i = (int) frame.getSize(); 

it is like;

int i = (int) height, weight. 

Briefly, you cannot assign two values to one variable. You should make some calculation(s) to have one value from these two values.