null pointer exception example

Listen to the teacher said, in the later study most of the anomalies are null pointer anomalies. So take a little time to play the game to check what is a null pointer exception One: The main causes of NULL pointer anomalies are as follows: (1)

Null Pointer exception is the most common and annoying exception. This topic describes how to avoid NULL pointer exceptions. First, let's look at the following example private Boolean isFinished(String status) { if

Http://www.cnblogs.com/losesea/archive/2012/11/16/2772590.htmlFirst say what is a pointer, as long as you understand the meaning of the pointer, you will understand the meaning of NULL.Suppose there is a statement int a=10;Then the compiler opens up

Author: JW. Zhou Date: 2014/7/2 1. NULL pointer (0/null) Returning null is equivalent to returning 0, because both null and 0 indicate null pointers. In other words, what is a null pointer is a pointer assigned 0, before initialization, the value is

I. Wild pointer The "wild pointer" is not a NULL pointer, but a pointer to the "junk" memory. There are two main causes of "wild pointer: (1) pointer variables are not initialized. When a pointer variable is created, it does not automatically become

About null pointers, wild pointers, general pointers, first of all, what is a pointer, as long as you understand the meaning of the pointer, you understand the meaning of NULL.Suppose there is a statement int a=10;Then the compiler opens up 1

In Java programming, one of the most common repeated (most complained) errors is a null pointer exception. Tracking the cause of one of these errors will cause you to doubt your decision. In diagnosing this part of Java code, we compile the most

1. Preface Try...catch...finally I'm afraid it's a familiar statement, and it's very simple to use, logically it seems to be easy to understand. However, I personally experience the "lesson" tells me that this thing is not as simple as the

1: nullpointerexception is derived from runtimeexception and is a running-level exception. This means that it may be thrown during running, and you need to check whether such a running level exception will interrupt your business logic. 2: The

Visual C + + exception (Exception) FAQCopyright: Doug Harrison 2001–2007Translation: Magictong (Tong Lei) March 2011Original address: http://members.cox.NET/doug_web/eh.htmThis article discusses some of the implementations in Visual C + + about try{}