PPT Slide

How to model a box? (Java example)

class Box {

int iLength;

int iWidth;

int iHeight;

public void setLength (int iNewLength) {

util.ASSERT (iNewLength > 0, “iNewLength <= 0”);

iLength = iNewLength;

} // of setLength

public void setWidth (int iNewWidth) {

util.ASSERT (iNewWidth > 0,

“iNewWidth <= 0”);

iWidth = iNewWidth;

} // of setWidth

public int getLength ( ) {

return (iLength);

} // of getLength

Evolution of an Object (cont’d)

Instance variables (because they’re not static)

Methods to change (‘modify’) instance variables

Method to get (‘access’) instance variable

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