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JAVA engineer interview questionsZookeeper
I went to a company for an interview today. I felt dizzy with my brains. I didn't make a few algorithm questions. The questions were relatively simple. I should have prepared myself, but the status was not good, after the
Do not write any scopes (that is, access rights) represent friendlyPublic, the largest, the largest scope, within the class, the same package, descendants class, other package can be accessedProtected protection, can be accessed within the class, the same package, descendant classes, but other package cannot accessFriendly friendly, within the class, the same package can be accessed, descendant class, other package cannot accessPrivate, minimal permissions, minimal scope, access within the class
Java interview questions
Basic knowledge:1. simple principles and applications of the Exception Handling Mechanism in C ++ or Java.
When a Java program violates the Java Semantic Rules, the Ja
"Declaration" Source: Power node Java Institute, reprint Source: Script House
(The answer to a small number of questions was slightly altered by me)
1, what is the thread local variable.
A thread-local variable is a variable within the thread itself, owned by the thread itself, and not shared among multiple threads. Java provides a ThreadLocal class to support t
Translation Links: http://www.codeceo.com/article/java-hashmap-value-sort.htmlThe English version: How to Sort HashMap Based on the Values in JavaTranslation Author: Code Rural network – Xiao Feng
HashMap in Java is a data structure for storing "key" and "value" information pairs. Unlike array, ArrayList, and linkedlists, it does not maintain the order in which elements are inserted.
Therefore, sorting hash
the length expands, the hash rules change as well.
Let's review the hash formula:index = hashcode (Key) (Length-1)
When the original array length is 8 o'clock, the hash operation is done with the 111B (representing the binary 7), and the new array length is 16,hash and 1111B (representing the binary 15). hash results are obviously different .
The Java code for rehash is as follows:
/**
* Transfers all entries from the current table to newtable.
Java interview questions: Implementation of stacks and queues
During the interview, stacks and queues are often checked in pairs. This article includes the following stack and queue test content:
1) stack Creation
2) create a queue
3) Two stacks implement one queue
4) two queues implement one stack
5) design the stack
need to lay the foundation, the IDE select one to understand.2. Study the idea of Java programming"Thinking in Java" This book is the Great God highly recommended books, since the great God recommended, we might as well study it.It does not guarantee that you are out of the new ranks, but will lead you to the path of master.3. Learning: HTML, CSS, JavaScript, JQuery, BootstrapIn addition to learning
be accessed throughout the class.The ② member variable is created as the object is built, disappears as the object disappears, and exists in the heap memory where the object resides.The ③ member variable has a default initialization value.Local variables:① Local variables are defined only within the local scope, such as within a function, within a statement, and only in the area to which they belong.② local variables exist in the stack memory, the scope of the action ends, and the variable spac
Analysis of Java interview questions and prevention of SQL injection, semi QL
This article focuses on a common question in the Java interview questions, how to judge and prevent SQL Injection problems. The details are as follows.
Basic java exception knowledge and some interview questions
Java is an object-oriented design language, so exceptions are encapsulated into classes in java, and we only need to know how to handle exceptions,
Exception Overview
Exception: An exception occurs when the
The Java Collection Framework is the most frequently asked question of Java interviewing, and it is necessary to understand the powerful features of Java technology to master the set framework. Here are some practical questions, often asked in the core Java
Java Architects interview questions, how to become architectsOften interview some candidates, sorted out my interview using the topic, LU continued to organize a lot of problems, so each time to draw a part to ask. The answer will be gradually released in later articles.
B
Today in a company (not disclosed) wrote a set of Java face questions. There is a question about this.
Which design pattern used in Java.lang.Runtime?
So what design pattern is used in the java.lang.Runtime?
And what design patterns are used in java.utils.collection.
At that time because of this unpopular knowledge not enough, and the API also read less, so a short answer.
back home and searched the ne
ImportNew Note: This article is one of the Java interview series compiled by ImportNew. You can view all the Java interview series from here.
The common Interview Questions introduced in this article are about the overloading meth
picture suffix 2, how to suffix is tampered with, then each file has a magic digital file upload-magic number5, the principle and implementation of Message Queuing Answer: 1, Message Queuing Principle 2, comprehensible message queue ActiveMQVi. Database Aspects1. The MySQL query field area is not case-sensitive?Answer: Do not differentiate, even if the value is not differentiated (I asked at the time, the area of the application of the size of the meaning of what, the interviewer did not say)2,
Java Questions Answers
1. What is the difference between an applet and an application?
A Java application is made up of a main () method declared as public static void that accepts a string array argument, along with any other classes that main () CILS. it lives in the environment that the Host OS provides.
A
inherit it. Subclass overwrites the finalize () method to sort system resources or perform other cleanup tasks. The finalize () method is called before the Garbage Collector deletes an object.
Second, can anonymous inner class (anonymous internal class) be extends (inherited) other classes, or implements (implemented) interface (Interface )?
An anonymous internal class is an internal class without a name. It cannot be extends (inherited) other classes, but an internal class can be used as an in
;. java.util Package: Java Utility Class Library Java.util package. In this package, Java provides some useful methods and data structures. For example, Java provides a date (Data) class, a calendar class to produce and get dates and times, a random number class that produces random numbers of various types, and a stack (stack), vector, bit set (Bitset), and a ha
.
}
}
56. Problem: Give an integer variable A, write two pieces of code, the first set of a bit3 is 1, the other bit does not change, how to implement it?
/**
* @author sanchan
* @since 1.0
*/
publicclassTest{
publicstaticvoidmain(String[]args){
//给一整型变量a,写两段代码,第一个设置a的bit3 为1,其他bit不变,怎么实现呢?
inta=8;
//打印二进制
System.out.println(Integer.toBinaryString(a));//输出 1000
System.out.println(Integer.toBinaryString(a|4));//输出 1100
}
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