abnormal :The import java.util cannot be resolved

 reason : It's because of your project buildpath incorrect
Solution : Right click on the item -------buildpath-------- The bottom one configuration The choice of libraries find JRE( This is when you'll find this jre There is ! Or red X) Choose remove Choose a new one for the project JRE Selected items ,project----clean

<<< java abnormal The import java.util cannot be resolved More articles about

  1. android Report errors ——The import android.util cannot be resolved

    Eclipse Import the external Android Engineering time , There will always be The import android.util cannot be resolved error , The solution is as follows : First check project.properti ...

  2. Java Exception resolution java.lang.IllegalArgumentException: Comparison method violates its general contract!

    Java  Exception resolution Add a sentence before your code System.setProperty("java.util.Arrays.useLegacyMergeSort", "true&q ...

  3. Java abnormal ( 3、 ... and ) 《Java Puzzles》 A few mysteries about anomalies in

    Summary This chapter is an introduction. <Java Puzzles> A few mysteries about anomalies in . This chapter takes the code as an example , It looks more interesting than the last chapter . The content includes : The riddle 1: Indecision puzzle 2: The ultimate mystery 3: An unwelcome guest ...

  4. -1-6 java A brief introduction java abnormal Abnormal system Throwable classification throws and throw exception handling Custom exception

      abnormal   abnormal : Exception is Java An error in the execution of a program . The origin of the anomaly : The problem is also a specific matter in real life , It can also be done through java In the form of a class , And encapsulate it as an object . In fact, that is Java Describe the abnormal situation ...

  5. Java abnormal : SimpleDateFormat java.lang.NumberFormatException: multiple points

    Java  SimpleDateFormat Multithreading is not supported . Use it in different threads at the same time One  SimpleDateFormat  Instance object to do date replacement , Or throw out the above 2 Kind of abnormal , therefore be used  SimpleDa ...

  6. Java Exception information handling

    import java.io.IOException; import java.text.SimpleDateFormat; import java.util.Date; import org.jun ...

  7. java abnormal , exception handling , Exception class keyword :throws and throw Custom exception class

    package cn.kecheng; import java.util.Scanner; /** abnormal : An exception is an abnormal condition that occurs during the operation of a program , It will interrupt the running program Exception handling mechanism :java in ...

  8. 【Java note 】 The configuration file java.util.Properties The use of the class

    The path to the configuration file : Project name /src/main/resources/mmall.properties mmall.properties The content of is the key value pair . For example, suppose you write ftp Some information about the server . ftp.serve ...

  9. NullPointerException The cause of the abnormality and java abnormal ??

    Null pointer exception , It's because it's empty (null) To call a property or method .   null There is no such object , Since there is no such object , So call his properties and methods , It will report an exception .   <-- There are mainly the following reasons :   1. Unused ...

Random recommendation

  1. ORA-14402: Updating the partition keyword column causes the partition to change

    By default ,oracle Partition table is not allowed for partition fields update Operation of the , If there is a partition field update, You're going to report a mistake ——ORA-14402: Updating the partition keyword column causes the partition to change . This can be done by opening the table ...

  2. ios The development of small skills to shake a screen capture

    1. Monitor the shake motion 1> Let the current view controller be the first responder // The current view controller must be the first responder before it can respond to action time [self becomeFirstResponder]; 2> Realization ...

  3. Realization JSON Data storage and reading

    preparation : // Create a Crime class public class Crime { private String mTitle; private UUID mUUID; private Date mDat ...

  4. motor helper

    # -*- coding: utf-8 -*- # @Time : 2019-02-13 10:44 # @Author : cxa # @File : mongohelper.py # @Softw ...

  5. 2017-2018-2 1723 『Java Programming 』 Course Pair programming exercises _ Summary of the third week of four operations

    Related test process screenshot The transformation from infix expression to suffix expression is tested Junit test , The integral and the fractional are carried out respectively , Test success screenshot Because in the generation and computation problems , The problems are random , Not for the time being Junit test , So there is no , But it should be positive ...

  6. echatrs The visualization can't be displayed after it is hidden, or there is a problem with its width

    I'm working on a visualization project recently , Using Baidu's ECharts.js As a visual view framework ,echarts There are many examples of , Basically meet the needs of the project , And the documentation is relatively complete . Clear , It's a good front-end visualization framework . Our project is to use b ...

  7. C# List&lt;string&gt; and ArrayList Separate into strings with the specified separator

    Original address :https://www.cnblogs.com/ahwwmb/p/4166707.html Concatenate all elements of a string array , Where the specified separator is used between each element List<string> ...

  8. front end —— SVG

    0. brief introduction SVG: Scalable vector graphics : SVG It's code , Through the analysis of the browser and rendering into a graphics : Scalable vector graphics are based on extensible markup language (XML), A graphic format that describes two-dimensional vector graphics , By the World Wide Web Consortium ( World W ...

  9. Set up af Yes Cookies Management of

    manager.requestSerializer.HTTPShouldHandleCookies = NO;

  10. Work in pairs _Two

    Part 1. Preface ( attach : All functions covered by this coding are java Language implementation ) Pair project assignments The blog of Gao Yuxiang personal github Portal post pdf link Part 2. Specific division of labor In this pairing operation, we simply split ...