java debugging questions

(throughput) collector? The throughput collector uses a parallel version of the new generation garbage collector, which is used for medium-sized and large-scale data applications. The serial collector is sufficient for most small applications, which require about 100M of memory on modern processors. 41. In Java, when can objects be garbage collected? This object can be recycled when the object becomes inaccessible to applications that currently use t

For example, in the current Web project there is a JSP page name is: welcome.jsp debugging in Eclipse, if you enter in the browser: http://localhost:8080/MavenWeb/welcome.jsp Displays the following error, Hint that the corresponding page could not be foundAnd if the input http://localhost:8080/MavenWeb/Welcome.jspIt can be displayed normally, the subsequent debugging must pay attention to, before the appear

In the debug category I share my previous debugging summary, after a few months, after this period of reflection, I summed up the Java EE Application development of a general idea, for reference only, welcome to share the discussion. At present, most applications are browser/server mode, then development is divided into two parts, that is, the public said the foreground (assuming the use of rich client fra

Java interview question Summary 2 (Continuous updates), java questions 1. How to format a date Answer:Date now = new Date (); SimpleDateFormat sdf = new SimpleDateFormat ("yyyy-MM-dd hh: mm: ss "); String formatNow = sdf. format (now ); The formatNow variable is the formatted date. 2. What are several implementation methods for multithreading? There are several

Some questions that are frequently asked during interviews with Java programmers on the Internet, although a little old, are still worth reading. 1. Let's talk about the differences between final, finally, and finalize. Final? Modifier (keyword) If a class is declared as final, it means that it cannot generate a new subclass and cannot be inherited as a parent class. Therefore, a class cannot be declared bo

Java basic set classic Training Questions, java basic set classic Question 1: 10 random strings are required, each string is not repeated, and the characters (a-zA-Z0-9) in each string are also different, each string is 10; Analysis: * 1. When you see this question, you may think of many methods in your mind, such as determining whether the generated string conta

In order to prepare for debugging, you need to set a breakpoint in the code first so that the debugger pauses execution allowing you to debug, otherwise the program will execute from the beginning to the end, and you will not have the opportunity to debug.1. Conditional breakpointBreakpoints everyone is familiar with, in the Eclipse Java editing area of the wardrobe double-click to get a breakpoint, the cod

Regular Interview Questions and answers by a ribaba Java engineer, Baba java 1. Implementation of Spring AOP and IOC Http://blog.csdn.net/tarena_lixy/article/details/7096114 Http://blog.csdn.net/kiss_vicente/article/details/6901295 Http://blog.csdn.net/it_man/article/details/4402245 2. Distributed message queue and distributed cache Message Queue: RabbitMQ, Kafka

Debugging Java code with JUnitBreak point first, right-click Debug as JUnit, open debug ViewClick F6, execute the statement of the variable, move the mouse over the variable to see the value of the variable650) this.width=650; "Src=" Http://s5.51cto.com/wyfs02/M02/8A/BC/wKiom1g5WNOBRZrZAAKuz0Mh3QM633.png-wh_500x0-wm_3 -wmp_4-s_1147963069.png "title=" screen (6). png "alt=" wkiom1g5wnobrzrzaakuz0mh3qm633.png

step debugging. The image above is a filter configuration that typically filters some of the JDK's classes and packages. The following figure is to turn on one-step filtering at debug time, otherwise it will not take effect. Jump to Frame Jumping to a frame is a kind of reentrant technique, in which eclipse can skip directly to any of the specified frames in the call stack and have the JVM rerun here. This allows you to rerun some of your code witho

is used for medium-sized and large-scale data applications. The serial collector is sufficient for most small applications, which require about 100M of memory on modern processors.41. In Java, when can objects be garbage collected?This object can be recycled when the object becomes inaccessible to applications that currently use the object.Is there a garbage collection in the permanent generation of 42.JVM?Garbage collection does not occur in a perma

Many netizens may have such doubts: the upper layer of my program is Java code and the lower layer is written in C/C ++. How can I debug it? The first thing we think of is ndk-GDB. ndk is provided by Google for native code development. ndk-GDB is used to debug native code. We also know that eclipse is used to debug Java code, and it cannot directly debug native code. If you can combine the two to debug

The JVM itself supports specifying parameters for the Java program to start in debug mode, and when the virtual machine is running in debug mode, you can remotely debug the program by simply connecting to its corresponding listening port. The following are the specific practices: 1. Start the program with the following parameters after the Java command: Java_debug_opt= "-server-xdebug-xnoagent-djava.compile

inherit it. Subclass overwrites the finalize () method to sort system resources or perform other cleanup tasks. The finalize () method is called before the Garbage Collector deletes an object. Second, can anonymous inner class (anonymous internal class) be extends (inherited) other classes, or implements (implemented) interface (Interface )? An anonymous internal class is an internal class without a name. It cannot be extends (inherited) other classes, but an internal class can be used as an in

Collector deletes an object. 13. Can anonymous inner class (anonymous internal class) be extends (inherited) other classes, or implements (implemented) interface (Interface )? An anonymous internal class is an internal class without a name. It cannot be extends (inherited) other classes, but an internal class can be used as an interface and implemented by another internal class. 14. The difference between static nested class and inner class is that the more you say, the better (the more general

Multithreading and concurrency issues are among the questions that interviewers prefer to ask in a Java technology interview. Here, the most important questions are listed from the interview point of view, but you should still have a solid grasp of the basics of Java multithreading to match the problems you encounter l

Debugging can help identify and resolve application flaws, in this article, the author will use the common development tools eclipse to debug Java applications. But the debugging methods described here are basically generic and apply to the NetBeans IDE, and we focus on the runtime. Before we begin, we recommend that you take a look at the Eclipse shortcuts artic

specific class)Center left: Source code bottom Left: Console//ImportantTop right: The process of changing variables. Very important4. How to perform the next step.F6: Progressive Debug F5: Step-by-step debugging5. After the debugging is finished, remove the breakpoint.Upper right--points---double X (break points)Finally, we will give you some exercises:Practice One:Print all the even numbers between 1-100 with a for loop.Use the For loop to print all

Some days ago, I wrote an article in the blog Park, how to introduce my project experience in the interview, Harvest more than 2000 clicks, which undoubtedly inspired me to continue to share the enthusiasm, today I come to share another interview can even help everyone to reverse the skills, this article is from the Java Web Lightweight Development Interview tutorial from the excerpt.--------------------------------------------------------------------

finalize () method to sort system resources or perform other cleanup tasks. The finalize () method is called before the Garbage Collector deletes an object. Second, can anonymous inner class (anonymous internal class) be extends (inherited) other classes, or implements (implemented) interface (Interface )? An anonymous internal class is an internal class without a name. It cannot be extends (inherited) other classes, but an internal class can be used as an interface and implemented by another i