what is rule engine in java

toLowerCase ()String s= "Welcome";System.out.println (S.touppercase ());The first method next () method "" "" \ T "\ r" \ n "Scanner input =new Scanner (system.in);String S1=input.next ();String S2=input.next ();String S3=input.next ();System.out.println (s1+ "~~~~~~" +s2);The second method type Enter a return lineScanner input =new Scanner (system.in);String S3=input.nextline ();System.out.println (S3);Four, read one character of a string weightString s3= "Hello

Click to enter _ more _java thousand ask1. What is a jar?The JAR (Java Archive) is a platform-independent file format. Can contain multiple files, several Java applets and their necessary components (. class files, pictures, sounds, and so on) can be packaged in a jar file.L

I think maybe I'm not the only one who has this question, so put it out.here are the answers given to me by Madai and Clkrst. Thank you for two people here. 　　my question is: What does the Java interface do ? 　　1, read from the book is the Java Program interface only defines

《　　Here are the answers from Madai and Clkrst. my question is, what does the: java interface do? 1, read from the book is the Java Program interface only defines constants and empty methods, what

Click to enter _ more _java thousand ask1. What is value passingValue delivery is the transfer of a value stored in a storage unit in memory space to another storage unit. (storage units in Java are not addresses of physical memory, but have dependencies)For example://定义了一个改变参数值的函数publicstaticvoidchangeValue(int x) {??

With the popularity of Java object-oriented language and the emergence of multi-layer architecture applications, application reusability has been greatly improved, and the framework is also emerging in applications, and has been widely used. So what is the framework? What ar

What is the difference between extends and implements in Java?1. In the class declaration, use the keyword extends to create a subclass of the class. A class declares its own use of one or more interfaces through the implements keyword.Extends inherits a class. After inheritance, you can use the method of the parent class or override the method of the parent clas

Let's start with the following simple statement: String x = null; What does this line of code do? Let's first think about what is variable and value ). We usually compare a variable to a box. We can use a box to hold things. Similarly, we can use variables to change the storage value. When defining a variable, you must specify the variable type. In

What is the difference between an Ear, Jar, and war file? What kind of environment they are used separately. In the file structure, the three are not different, they are in the zip or jar file compression format. But they are used for different purposes: Jar file (with the extension. Jar) contains common libraries, resources, and auxiliary files (auxiliary files)