Equivalent Statements

Here is the original fragment, which uses AND:

if (  !(speed > 2000 && memory > 512)  )
  System.out.println("Reject this computer");
else
  System.out.println("Acceptable computer");

Here is an equivalent fragment that uses OR:

if (  speed <= 2000  ||  memory <= 512 )
  System.out.println("Reject this computer");
else
  System.out.println("Acceptable computer");

Yet another equivalent fragment reverses the order of the true and false branches of the statement.

if (  speed > 2000  &&  memory > 512 )
  System.out.println("Acceptable computer");
else
  System.out.println("Reject this computer");

The last fragment is probably the best choice because it is the easiest to read. It follows the pattern:

if ( expression that returns "true" for the desired condition )
  perform the desired action
else
  perform some other action