immutable class

Today to share the Java focus on the wrong part of the point, but also the interview needs of all students to prepare, welcome to communicate correct.The main method in 1.java is a static method, that is, the code in the method is stored in a static

0. Java Basic data TypeThe bitwise operations of Java (bitwise operators) operate directly on bits of integer types, including long,int, short,Char and byte, the bitwise operator is the following table: Operator

11. Is it possible to make a call to a non-static method from within a static method?No. Because the non-static method is to be associated with an object, you must create an object before you can make a method call on the object, and the static

What is Shadow clone. The following example contains three class Unclonea,cloneb,clonemain. The Cloneb class contains a Unclonea instance and an int type variable, and overloads the Clone () method. The Clonemain class Initializes an instance of the

This article explains the final basic usage and the inside advantage and disadvantage, original is not easy, reprint please indicate the sourceThe article is divided into 3 parts, will give you the final keyword on the class, methods and variables

1) What is a thread?A thread is the smallest unit that the operating system can perform operations on, which is included in the process and is the actual operating unit of the process. Programmers can use it for multiprocessor programming, and you

Transferred from: http://www.importnew.com/10980.htmlIn this article we are going to discuss the different types of face questions in a Java interview, which allow employers to test the candidate's Java and common object-oriented programming

In this article we are going to discuss the different types of face questions in a Java interview, which allow employers to test the candidate's Java and common object-oriented programming capabilities. The following sections are divided into two

1 String = different from newAssigning a value with "=" does not necessarily create a new string each time, but instead finds the string from the string instance pool . When you assign a value using "new", a new string is created each time.2 string

Difference1, string is immutable class, StringBuffer is variable classIf the string object is to be modified, a copy of the original string is created, and the copy is stringbuffer,stringbuffer.tostring () converted to a string modification on the

Original URL: http://blog.csdn.net/cool_sti/article/details/21658521Original English Link: http://javarevisited.blogspot.hk/2014/03/how-to-clone-collection-in-java-deep-copy-vs-shallow.htmlProgrammers often misuse copy constructors or other methods

Original link: http://www.importnew.com/12773.htmlWhether you are a new programmer or a veteran, you must have encountered a thread-related problem in your interview. An important feature of the Java language is the built-in support for concurrency,

First, post the test case:1 Package test;2 3 import org.junit.Test;4 5 /**6 * Created by Administrator on 2015/9/16.7 *8 */9 Public classteststring {Ten OneString str1 ="Hello Quanjizhu";//if not in the string pool, create a new object and put

1. What is a Java virtual machine? Why is Java called a "platform-agnostic programming language"? A Java Virtual machine is a virtual machine process that can execute Java bytecode. The Java source file is compiled into a bytecode file that can

"Note Do not write accessor methods that return references to mutable objects." Because it destroys the encapsulation of a class, the contents of the reference may be changed, resulting in a business logic error.What is a mutable object?To

The basic problems of multithreading, concurrency, and threading1) Can I create a volatile array in Java?Yes, you can create an array of volatile types in Java, but only a reference to an array, not an entire array. I mean, if you change the array

The difference between string and stringbuffer can be said to be numerous online materials. However, when I saw this article, I felt that the small examples in the article were representative. So I made a summary. There are three classes in Java to

A Java array is a Java object. The length of an array is fixed. Only data of the same type can be stored in the same array. An array can store data of the basic type, you can also store reference data. When creating an array object, you must specify

In addition to using the constructor to obtain an instance of the class, you can also use the static factory method ). The following method converts the basic Boolean Type to a Boolean object reference: 1 public final class Boolean implements Java.

1. Stack and heap in Java) (1) Memory Allocation PolicyAccording to the compilation principle, there are three policies for memory allocation during program running: static, stack, and heap.Static Storage Allocation refers to the ability to