how to get chrome window size code example

Example 1: how to resize browser

To resize browser window 
-I would create object of dimensions class
Dimension newD = new Dimension(480,620)
-Than I resize the current window to the given dimension
driver.manage().window().setSize(newD)

Example 2: how to find the size of a web page

Dimension initial_size = driver.manage().window().getSize();
    int height = initial_size.getHeight();
    int width = initial_size.getWidth();