Example usage for java.lang NullPointerException NullPointerException

Introduction

In this page you can find the example usage for java.lang NullPointerException NullPointerException.

Prototype

public NullPointerException(String s)

Source Link

Document

Constructs a NullPointerException with the specified detail message.

Usage

From source file:Main.java

/**
 * Drawable convert to Bitmap//  w w  w.j  ava  2s .  c  o m
 */
public static Bitmap drawableToBitmap(Drawable drawable) {
    if (drawable == null) {

        throw new NullPointerException("drawableToBitmap()-->drawable is null.");
    }

    int width = drawable.getIntrinsicWidth();
    int height = drawable.getIntrinsicHeight();
    Bitmap bitmap = Bitmap.createBitmap(width, height,
            drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565);
    Canvas canvas = new Canvas(bitmap);
    drawable.setBounds(0, 0, width, height);
    drawable.draw(canvas);
    return bitmap;

}

From source file:MainClass.java

static String capitalize(String s) throws NullPointerException, AlreadyCapitalizedException {
    if (s == null) {
        throw new NullPointerException("Your passed a null argument");
    }/*from ww  w.j a  va2  s. co  m*/
    Character firstChar = s.charAt(0);
    if (Character.isUpperCase(firstChar)) {
        throw new AlreadyCapitalizedException();
    }
    String theRest = s.substring(1);
    return firstChar.toString().toUpperCase() + theRest;
}

From source file:Main.java

/**
 * Ensures that the object passed is not null.
 *
 * @param object   The object nullable.// w  w  w .j  a va2 s. c o  m
 * @param property The property.
 */
public static void notNull(@Nullable Object object, @NonNull String property) {
    if (object == null) {
        throw new NullPointerException(property + " == null");
    }
}

From source file:Main.java

public static <T> T checkNotNull(T reference, @Nullable Object errorMessage) {
    if (reference == null) {
        throw new NullPointerException(String.valueOf(errorMessage));
    } else {/* ww  w  .  ja va 2 s .  co  m*/
        return reference;
    }
}

From source file:Main.java

public static <T> ImmutableList<String> toStrings(Collection<T> input) {

    List<String> result = Lists.newArrayList();

    for (T current : input) {

        if (current == null)
            throw new NullPointerException("Null objects not allowed");

        result.add(current.toString());/*ww  w. j  a  va2 s  .  c om*/
    }

    return ImmutableList.copyOf(result);

}

From source file:Main.java

public static Object getAdditionalInstanceField(Object obj, String key) {
    if (obj == null)
        throw new NullPointerException("object must not be null");
    if (key == null)
        throw new NullPointerException("key must not be null");

    HashMap<String, Object> objectFields;
    synchronized (additionalFields) {
        objectFields = additionalFields.get(obj);
        if (objectFields == null)
            return null;
    }// w w w  . ja v a 2 s . co m

    synchronized (objectFields) {
        return objectFields.get(key);
    }
}

From source file:Main.java

public static Object removeAdditionalInstanceField(Object obj, String key) {
    if (obj == null)
        throw new NullPointerException("object must not be null");
    if (key == null)
        throw new NullPointerException("key must not be null");

    HashMap<String, Object> objectFields;
    synchronized (additionalFields) {
        objectFields = additionalFields.get(obj);
        if (objectFields == null)
            return null;
    }//from  w w  w  .ja v a 2 s .c  o m

    synchronized (objectFields) {
        return objectFields.remove(key);
    }
}

From source file:Main.java

/**
 * Performs some basic check-ups on a given bitmap picture.
 *
 * @param pictureBitmap The bitmap that must be checked
 *//*from www  .j  a  va2s . c  o  m*/
public static void checkBitmap(Bitmap pictureBitmap) {

    if (pictureBitmap == null) {
        throw new NullPointerException("Picture bitmap cannot be null");
    }

    if (pictureBitmap.getWidth() == 0 || pictureBitmap.getHeight() == 0) {
        throw new InvalidParameterException("Picture must have a valid size");
    }
}

From source file:Main.java

public static Object setAdditionalInstanceField(Object obj, String key, Object value) {
    if (obj == null)
        throw new NullPointerException("object must not be null");
    if (key == null)
        throw new NullPointerException("key must not be null");

    HashMap<String, Object> objectFields;
    synchronized (additionalFields) {
        objectFields = additionalFields.get(obj);
        if (objectFields == null) {
            objectFields = new HashMap<String, Object>();
            additionalFields.put(obj, objectFields);
        }/*from   w  ww  . j  a  v a2 s  . com*/
    }

    synchronized (objectFields) {
        return objectFields.put(key, value);
    }
}

From source file:Main.java

/**
 * Join the {@code strings} into one string.
 * //from   w ww.  j  a  v  a  2s. c  om
 * @param strings the string list to join
 * 
 * @return the joined string
 */
public static String join(List<String> strings) {
    if (strings == null) {
        throw new NullPointerException("argument 'strings' cannot be null");
    }
    return join(strings.toArray(new String[strings.size()]));
}