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1 , what are the aspects of object-oriented features ?　　The object-oriented programming language has 4 main features: encapsulation, inheritance, abstraction, polymorphism, etc.Details:http://www.cnblogs.com/guweiwei/p/6599289.html2 , access modifiers public,private,protected, and what is the difference between not writing (the default)? 　　Defaults to default when members of a class do not write access adornments. The default is equivalent to exposing (public) to other classes in the same packag

: The above can solve the POST request garbled problem. There are two garbled methods for GET request Chinese parameter:Modify the Tomcat profile add code to match the project code as follows: Another way to re-encode parameters: StringuserName =newString (Request.getparamter ("UserName"). GetBytes ("Iso8859-1"), "Utf-8") Iso8859-1 is the tomcat default encoding, and the Tomcat encoded content needs to be encoded by utf-8What is

Java interview Knowledge point of database interview 1. Primary key Super Key candidate key foreign key Primary key: A combination of data columns or attributes that are uniquely and fully identified in a database table for storing data objects. A data column can have only one primary key, and the value of a primary key cannot be missing, that is, it cannot be

Java Interview Questions Library recommendation Directory (?) [-] 324 Java interview questions for IT Enterprises Introduction 324 Java interview questions for IT Enterprises Example Go to Chapter 324 of the 1st

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

began to seize the free time to learn. The process of learning is as follows:1. Look up questionsThe first step of normal people will certainly look at the interview questions, I am no exception, in the process of watching, I found some articles written well, to my help is not small worth recommending, as follows:Java Surface test Complete (on) a lot of basic things, suggested first look.Summary of the questions of

Java Algorithm interview questions: What are the methods for sorting? List. Use JAVA to implement a fast sorting. Select bubble quick set to sort by at least four methods, java Algorithm Package com. swift; import java. util. arrayList; import

PackageCom.swift;ImportJava.io.File;ImportJava.io.FileFilter;ImportJava.io.FileInputStream;ImportJava.io.FileOutputStream; Public classIo_filefilter { Public Static voidMain (string[] args)throwsexception{/** Write a program to copy all the. java files under the E:\neck directory to the E:\jpg directory and change the original file extension from. java to. jpg*/file[] File=NewFile ("E:\\neck"). Listfiles (N

Java interview questions, java questions1. Can a ". java" source file contain multiple classes (not internal classes )? What are the restrictions?A: Yes, but there can only be one public class. If there is a public class, the file name must be the same as the class name.2. Does Jav