Shulou(Shulou.com)06/01 Report--

This article mainly introduces "what are the common interview questions in Java". In the daily operation, I believe that many people have doubts about the common interview questions in Java. The editor consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful for you to answer the doubts about "what are the common interview questions in Java?" Next, please follow the editor to study!

1. What is the Bubble S architecture? What is the Cpact S architecture?

Bounce S (Browser/Server), browser / server program

Cpact S (Client/Server), client / server, desktop application

two。 What are the network protocols you know?

HTTP: hypertext transfer Protocol

FTP: file transfer protocol

SMPT: simple Mail Protocol

TELNET: remote Terminal Protocol

POP3: message reading protocol

What development platforms does 3.Java have?

JAVA SE: mainly used in client development

JAVA EE: mainly used in web application development

JAVA ME: mainly used in embedded application development

4. What is JVM? What does the java virtual machine include?

JVM:java virtual machine, a virtual computer implemented by hardware or software, Java virtual machine includes: register, stack, processor

Does 5.Java require developers to collect memory garbage?

In most cases, it is not necessary. Java provides a system-level thread to track memory allocation, and memory areas that are no longer in use will be automatically reclaimed

6. What is JDK? What is JRE?

The JDK:java development kit:java development kit is the environment that developers need to install.

JRE:java runtime environment:java running environment, the environment that needs to be installed for java programs to run

7. What is a data structure?

The way computers save and organize data

What are the data structures of 8.Java?

Linear table (ArrayList)

Linked list (LinkedList)

Stack (Stack)

Queue (Queue)

Figure (Map)

Tree (Tree)

9. What is OOP?

Object oriented programming

10. What is object-oriented?

Everything in the world can be regarded as an object. Each object includes dynamic behavior and static attributes, which constitute an object.

11. What is the relationship between class and object?

The class is the abstraction of the object, the object is the concrete of the class, the class is the template of the object, and the object is the instance of the class.

There are several data types in 12.Java

Plastic surgery: byte,short,int,long

Floating point: float,double

Character type: char

Boolean: boolean

13. What is implicit conversion and what is explicit conversion

Show conversion is type overturning, forcing a large type of data to be assigned to small type data; implicit conversion is that a wide range of variables can accept a small range of data; implicit conversion and explicit conversion are actually automatic type conversion and forced type conversion.

Can 14.Char type be converted to int type? Can it be converted to string type? can it be converted to double type?

Char is also a special type in java. Its int value starts from 1 and has a total of 2 to the 16th power of data. Char

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