In Java, when multiple threads operate a collection object at the same time, a ConcurrentModificationException exception may occur. This exception usually occurs when traversing the collection when modifying or deleting elements. This will cause the state of the collection to be inconsistent, thus throwing abnormal. This article will delve into the causes and solutions to this exception. 1. Causes of Exception Normally, ConcurrentModificationException exception

In PHP development, you may encounter errors such as "PHPFatalerror:Uncaughtexception'PDOException'". This is an exception caused by an error when PHP operates the database. If this error is not handled in time, it will cause program interruption or unexpected errors. So how to solve this problem? Here are some common solutions. 1. Check the database parameters. First, we need to check the parameters passed when connecting to the database.

How to use try and catch in C requires specific code examples. In C language, there is no built-in try and catch mechanism for exception handling. However, the functionality of try and catch can be simulated by using the setjmp and longjmp functions. Below I will introduce in detail how to use these two functions for exception handling and give corresponding code examples. First, we need to understand the principles of the setjmp and longjmp functions. When the setjmp function is called, the current program will be saved.

How to deal with UnsupportedEncodingException in Java? In Java programming, you may encounter UnsupportedEncodingException. This exception is usually caused by incorrect encoding conversion or an unsupported encoding. In this article, we will introduce the causes of UnsupportedEncodingException exception and how to deal with it. What is UnsupportedE

In Java development, we often use arrays to store a series of data because of the convenience and performance advantages of arrays. However, in the process of using arrays, some exceptions will occur, and one of the common exceptions is ArrayStoreException. This exception is thrown when we store incompatible data types in the array. This article will introduce what an ArrayStoreException is, why it occurs, and how to solve it. 1. Arr

What are the common causes of ConcurrentModificationException in Java? When traversing a collection using an iterator in the Java collection framework, a ConcurrentModificationException exception is sometimes thrown, which is one of the common Java exceptions. So, what is the reason for this exception? First, we need to understand that the iterators provided by the Java collection framework are stateful. That is, when traversing

The Exception class and the Error class are both subclasses of the java.lang.Throwable class. We can handle runtime exceptions, but not errors. Exceptions are objects that represent logical errors that occur at runtime, causing the JVM to enter an "ambiguous" state. Objects automatically created by the JVM to represent these runtime errors are called exceptions. Error is a subclass of the Throwable class that indicates serious problems that reasonable applications should not try to catch. Most of these errors are anomalies. If an exception occurs, we can use try and catch blocks to handle it. If an error occurs that we cannot handle, the program will terminate. There are two types of exceptions, one is CheckedExce

In Java programming, array is an important data structure. Arrays can store multiple values ??in a single variable, and more importantly each value can be accessed using an index. But while working with arrays, some exceptions may occur, one of them is ArrayStoreException. This article will discuss common causes of ArrayStoreException exceptions. 1. Type mismatch The element type must be specified when the array is created. When we try to store incompatible data types into an array, it throws