The code below shows how to get the color for the given constant.

Java Code:
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.widgets.Display;

public class MainClass {
  static Display display = new Display();

  public static void main(String[] args) {
    Color col = display.getSystemColor(SWT.COLOR_BLUE);
  }