Do not break portability

Portability across different operating systems is one of the principal advantages of using Java.

Here are some ways to ensure your application remains portable:

Common System.getProperty(String) items can be placed in a general purpose constants class:

* Collected constants of very general utility.
* All constants must be immutable.
* No instances of this class can be constructed.
public final class Consts {

  * Prevent object construction outside of this class.
  private Consts(){

  * Only refer to primitives and immutable objects.
  * Arrays present a problem since arrays are always mutable.
  * DO NOT USE public static final array fields.
  * One style is to instead use an unmodifiable List, built in a
  * static initializer block.
  * Another style is to use a private array and wrap it up like so:
  * <pre>
  *  private static final Vehicle[] PRIVATE_VEHICLES = {...};
  *  public static final List VEHICLES =
  *         Collections.unmodifiableList(Arrays.asList(PRIVATE_VEHICLES));
  * </pre>

  public static final String NEW_LINE = System.getProperty("line.separator");
  public static final String FILE_SEPARATOR = System.getProperty("file.separator");
  public static final String PATH_SEPARATOR = System.getProperty("path.separator");

  public static final String EMPTY_STRING = "";
  public static final String SPACE = " ";
  public static final String PERIOD = ".";
  public static final String TAB = "\t";

  //algebraic signs
  public static final int POSITIVE = 1;
  public static final int NEGATIVE = -1;
  public static final String PLUS_SIGN = "+";
  public static final String NEGATIVE_SIGN = "-";

See Also :
Class for constants
Thread priorities are not portable