try catch block

Java study notes 5-class methods, java study notes 5 -- URL: http://www.cnblogs.com/archimedes/p/java-study-note5.html.1. Method Control Process There are three main process control structures in Java: Sequential Structure Select Structure If

1. try-catchECMA-262 version 3rd introduces the try-catch statement, the basic syntax is as follows: try {} catch (error) {} if any code in the try block has an error, the catch Block is executed immediately. In this case, the catch block receives

Java thread security Lock, java thread lock Java. util. concurrent. locks We used the synchronized keyword for thread security. For thread collaboration, we used Object. wait () and Object. Policy (). In JDK1.5, java provides Lock for us to

Hibernate Summary (1), Hibernate Summary ( Hibernate provides cache and snapshot mechanisms to improve performance. Its cache can be classified into Level 1 cache and level 2 cache. Hibernate level-1 cache: When an SQL statement is executed in a

C # study notes 9, 1.Multicast delegate: The Delegate declared by the keyword with delegate. After compilation, the Delegate inherited the delegate and MulticastDelegate types by default. Therefore, the Delegate declared naturally contains the

C # Study Notes 13, 1.Task Overview: a Task is an abstraction of the operating system threads to enable the thread pool to efficiently manage thread allocation and collection. The underlying thread used by a Task is a shared resource, tasks need to

Java exception encapsulation (custom error codes and descriptions, with source code) Only when I really work can I find that exceptions in Java are still very common in real work. You must know when to throw an exception. Of course, all the

  I recently read the book "javascript advanced program" and write my own experiences with caution. I hope you can get some guidance and discussion from the ox.   Today's question is: javascript event processing functions. We know that interaction

Java basic knowledge collection and collation1. What are the characteristics of object-oriented?Inheritance, encapsulation, polymorphism, abstractionWhat is the mechanism to achieve polymorphism in 2.Java?Inheritance and InterfacesWhat kinds of

The JPA Java Persistence API is a standard ORM interface for Java EE 5 and is part of the EJB3 specification.Hibernate, today's popular ORM Framework, is an implementation of JPA, but its functionality is a superset of JPA.the relationship between

First, the reason why we do this:1. Efficiency (most important)2. Readability, easy to post maintenance. (also very important)Second, the Code optimization requirements:1. Reduce the volume of the code.2. Improve the operation efficiency of the code.

A situation that often occurs in a project, there is a list, such as a list of cases, click an item in the list to jump to the details page. The details are generated according to a record that was clicked, because the case and the specific detail

I. Handling events (i)Events ( Event ) is the action that the user performs when the page is accessed. Submitting the form and moving the mouse over the image are two events. When a browser detects an event, such as a mouse click or keystroke, it

$apply () and $digest () are two core concepts in AngularJS, but sometimes they are confusing. To understand how AngularJS works, you first need to understand how $apply () and $digest () work. This article is intended to explain what $apply ()

Abstract Programming Interface-abstract class-parent class-specific class 1. Review T-SQL -> Database creation, table creation, and constraints (DDL) -> Database creation If (db_id (Database Name) is not null Drop database name; Create database name;

One problem with the checked exception is that it is sometimes not allowed to throw such exceptions. In particular, if you want to override the methods declared in the superclass or implement the methods declared in the interface, and that method

In short, Checked checks in the compile phase and must be handled using try catch or throws, such as FileNotFoundException. Unchecked means that the compile phase will not be checked. For example, ArithmeticException Division (divided by 0)       In

Spring-AOP BasicsDynamic proxy Will we encounter this situation during our daily development?The red box shows the logs to be output. Do you find that most of the information in the logs is the same? If we want to modify a place, we need to modify

Translation PHP7 Introduction: New Features and removal features /** * Source: Https://www.toptal.com/php/php-7-performance-features * @author dogstar.huang 2016-03-13 */ In the PHP world, one of the most exciting messages

reference:http://blog.csdn.net/dm_vincent/article/details/38705099$apply () and $digest () are two core concepts in AngularJS, but sometimes they are confusing. To understand how AngularJS works, you first need to understand how $apply () and