Java Code Snippets

Byte array to hex string

public static String toHexString(byte[] array) {
    return javax.xml.bind.DatatypeConverter.printHexBinary(array);
}

Code in comments

/**
 * <PRE>
 * insert code as you would anywhere else
 * </PRE>
 */

An Example from a java.awt.Event method javadoc:

/**
 * <PRE>
 *    int onmask = SHIFT_DOWN_MASK | BUTTON1_DOWN_MASK;
 *    int offmask = CTRL_DOWN_MASK;
 *    if ((event.getModifiersEx() & (onmask | offmask)) == onmask) {
 *        ...
 *    }
 * </PRE>
 */

Get field descriptions (names)

public static <T, K> Map<K, String> getFieldDescriptions(Class<T> clazz) {
	Map<K, String> map = new HashMap<K,String>();
	for (Field f : clazz.getDeclaredFields()) {
		int mod = f.getModifiers();
		if (Modifier.isPublic(mod) && Modifier.isFinal(mod) && Modifier.isStatic(mod)) {
			try {
				@SuppressWarnings("unchecked")
				K fld = (K) f.get(null);
				
				Integer st = null;
				if (fld instanceof Integer) {
					st = (Integer) fld;
				} else if (fld instanceof Short) {
					st = (int) (short) (Short) fld;
				}
				map.put(fld, String.format("0x%04X, %s", st&0xFFFFFFFF, f.getName()));
			} catch (Exception ex) {
				/* ignore */
			}
		}
	}
	
	return map;
}

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