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

public static File getFile(File directory, String[] names) {
    if (directory == null) {
        throw new NullPointerException("directorydirectory must not be null");
    }//www.j  a  va 2s . c  o m
    if (names == null) {
        throw new NullPointerException("names must not be null");
    }
    File file = directory;
    for (String name : names) {
        file = new File(file, name);
    }
    return file;
}

From source file:Main.java

public static void checkNoNullElements(Collection<?> collection, String name) {
    if (collection == null)
        throw new NullPointerException(name);

    int index = 0;
    for (Object element : collection) {
        if (element == null)
            throw new NullPointerException(name + "[" + index + "]");
        index++;/*w ww. j ava  2  s.  com*/
    }
}

From source file:Main.java

public static int indexOf(byte[] datas, int start, byte[] t) {

    if (datas == null || t == null) {
        throw new NullPointerException("source or target array is null!");
    }//w  w  w . j  ava2 s  . co m

    int index = -1;
    int len = datas.length;
    int tlen = t.length;

    if (start >= len || len - start < tlen) {
        return -1;
    }

    while (start <= len - tlen) {
        int i = 0;
        for (; i < tlen; i++) {
            if (datas[start + i] != t[i]) {
                break;
            }
        }

        if (i == tlen) {
            index = start;
            break;
        }

        start++;
    }

    return index;
}

From source file:Main.java

public static Context getContext() {
    if (context != null)
        return context;
    throw new NullPointerException("u should init first");
}

From source file:Main.java

public static String[] splitTitleAndContent(String src) {
    if (src == null) {
        throw new NullPointerException("Helper: splitTitleAndContent(src) - src cannot be null");
    }/*w  ww. j a v  a  2  s.c o m*/

    final int srcLength = src.length();
    String[] out = new String[2];

    int firstNewLinePosition = src.indexOf('\n');

    //the given String contains only one line
    if (firstNewLinePosition == -1) {
        out[0] = src;
        out[1] = "";
    } else {
        //extract the title
        out[0] = src.substring(0, firstNewLinePosition);
        //extract the content
        out[1] = src.substring(firstNewLinePosition + 1, srcLength);
    }

    return out;
}

From source file:Main.java

public static int bytesToInt(boolean asc, byte... bytes) {
    if (null == bytes) {
        throw new NullPointerException("bytes is null!");
    }/*from  ww  w .j  a  va 2  s.  c  o  m*/
    final int length = bytes.length;
    if (length > 4) {
        throw new IllegalArgumentException("Illegal length!");
    }
    int result = 0;
    if (asc)
        for (int i = length - 1; i >= 0; i--) {
            result <<= 8;
            result |= (bytes[i] & 0x000000ff);
        }
    else
        for (int i = 0; i < length; i++) {
            result <<= 8;
            result |= (bytes[i] & 0x000000ff);
        }
    return result;
}

From source file:Main.java

public static boolean validateNodeName(Node node, String nodeName) {
    if (node == null)
        throw new NullPointerException("Node cannot be null!");
    if (nodeName == null)
        throw new NullPointerException("Nodename cannot be null!");
    return nodeName.equals(node.getNodeName());
}

From source file:Main.java

public static boolean isHorizontalBitmap(Bitmap bitmap) {
    if (bitmap == null)
        throw new NullPointerException("Bitmap can not be null!");
    return bitmap.getWidth() < bitmap.getHeight();
}

From source file:Main.java

public static ActivityManager getActivityManager(Context context) {
    if (context == null) {
        throw new NullPointerException("context can not be empty");
    }//from   w ww. j  av a 2 s  .  c  om
    return (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
}

From source file:Main.java

public static <T> T nonNull(T value, String msg) {
    if (value == null) {
        throw new NullPointerException(msg);
    }/*ww  w  . j  a v  a2s .  c  o m*/
    return value;
}