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} Public Static voidfunction2 () {//There are some differences in division, and it is important to noteBigDecimal B1 =NewBigDecimal ("1.301"); BigDecimal B2=NewBigDecimal ("101"); //BigDecimal B3 = b1.divide (B2);//if it's not divisible, there'll be an exception .BigDecimal B3 = b1.divide (b2,2, BIGDECIMAL.ROUND_HALF_UP); //The second parameter is the meaning of preserving two decimal places//The third parameter is the retention mode: the nearest number rounding (that is, rounding retent
International date format; output result: sunjun1401:17:56cst2015system.out.println (date );//Format Date Stringdatestr=sdf.format (date);//Output Result: 2015-06-1401:22:27system.out.println ( DATESTR);//Gets the Calendar class object Calendarcalendar=sdf.getcalendar ();//Gets the month and day time of the second intyear= Calendar.get (calendar.year);///NOTE: Get monthThe value is Intmonth=calendar.get starting from 0 (calendar.month); Intday=calend
Java export Excel file through XML, Java Excel Export tool class, Java Export Excel tool class==============================? Copyright Sweet potato Yiu September 13, 2017http://www.cnblogs.com/fanshuyao/Directly on the code:Import Java.io.ioexception;import Java.lang.reflec
Struts2: java. lang. NoSuchFieldException: resourceEntries at java. lang. Class. getDeclaredField (Class. java: 1901), resourceentries During the Struts2 test case today, the program can jump normally, but an error is reported on the Console, as shown below: 1 java.lang.No
Java Date Tool class, Java Time Tool class, Java time format>>>>>>>>>>>>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>? Copyright Sweet Potato Yiu February 4, 2017 15:03:27 Saturdayhttp://www.cnblogs.com/fanshuyao/Annex Download See: Http://fanshuyao.iteye.com/blog/2355386.
1. A Java program is a collection of classes.A class in a program has two kinds of arrangement structures. For example: classenclosingclass{..... Class anestedclass{......} } 2. In some special cases, a class is also placed within the internal definition of another class,
We all know that Java classes can be decorated by public, default (default, not write), meaning that they are allowed to be publicly accessible and that only other classes within the package are allowed access, whereas classes within the same package are often collaborating to accomplish the same functionality. In addition, we encounter classes that are only part of the implementation or composition of some other
JAVA class summary, java class SummaryJAVA class Summary I recently read some content related to java internal classes and made some summary. Released in sync with my blog zhiheng. me. Title:
Java internal class analysis, Java Class AnalysisI. Introduction Currently, as an intern in Android development, more and more developers are found to be unable to use it, such as the use of internal classes, therefore, after searching for materials on the Internet and summarizing them, I would like to share with you a
=1000Atomiclongfieldupdater Source Analysis (based on jdk1.7.0_40)Atomiclongfieldupdater Full Source/** ORACLE proprietary/confidential. Use are subject to license terms.*********************//******* Written by Doug Lea with assistance from members of JCP JSR-166* Expert Group and released to the public domain, as explained at* http://creativecommons.org/publicdomain/zero/1.0/*/Package java.util.concurrent.atomic;Import java.lang.reflect.*;Import Sun.misc.Unsafe;Import sun.reflect.CallerSensiti
P1 are die, if the P1 object dies, then P2 will notHome, this is really unfair to P2, and if you create a home object for P1 and P2, you waste resources. So in this case,It is appropriate to use static internal analogies for ordinary internal classes.the difference between a static inner class and a normal inner class(1) Ordinary inner classes cannot declare static methods and variablesOrdinary inner class
The Inner class(inner Class) defines the classes in the class. (generally Java's argument)The Nested class(nested Class) is a static (static) inner class. (generally C + + parlance)Static inner
Reprinted from: http://chenzhou123520.iteye.com/blog/1597597The Java Virtual Machine specification does not have a mandatory constraint on when to start the class loading process, but for the initialization phase, the virtual machine specification strictly stipulates that there are only four cases where the class must be "initialized" (while the load, validate, p
Java class loader and java class loading This article mainly introduces the java class loader and write your own simple class loader. Multiple clas
The class object is generated in the following way:1. Class Name: The JVM will use the class loader to load the class into memory (provided that the class has not been loaded into memory) and does not do the initialization of the class
Java internal class usage summary, java class usage Summary 1. What is an internal class?The class defined in the class is called the internal clas
Java Multithreading Basics (ii) Timer class: Timer class and TimerTask classThe Timer class and the TimerTask class are an early way for the JDK to implement the timer function, and jdk1.5 previously supported the timer class and
one StringBuilder class (1) Recognize StringBuilder class In Java, in addition to using the string class to store strings, you can also use the StringBuilder class or the StringBuffer class to store strings, where you need toIt i
Interfaces can inherit Interfaces. Abstract classes can implement (implements) interfaces, and abstract classes can inherit concrete Classes. There can be static main methods in an abstract class.Q: Does an abstract class inherit entity classes (concrete Class)A: An abstract class can inherit an entity class, but only
All properties in the interface are public static final, and the methods are public. The access modifier must be either the public interface or the other interface, similar to the inheritance of the class, the keyword extendsHttp://www.cnblogs.com/dolphin0520/p/3811437.htmlDeep understanding of Java interfaces and abstract classesHttp://baike.baidu.com/view/2493204.htm interface-Oriented programmingAn inter
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