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What to do if the java -version command reports an error

Solution to the error reported by the java -version command: First open the [Windows\System32] and [Windows\SysWOW64] folders in the C drive; then find the [java.exe], [javaw.exe], and [javaws.exe] files and delete them That’s it.

Oct 20, 2020 am 10:19 AM

java version

Solve a bug caused by i++

The java basic tutorial column introduces bugs caused by i++.

Oct 19, 2020 pm 05:40 PM

i++ java

Let's talk about kotlin's covariance and contravariance from Java

The java basic tutorial column introduces kotlin's covariance and contravariance today.

Oct 13, 2020 am 11:14 AM

Java kotlin

Java High Concurrency System Design - Cache

The java basics column today introduces the caching chapter of java high concurrency system design.

Oct 10, 2020 pm 05:24 PM

java高并发

A super detailed summary of JVM reflection principle technical points~

The java basics column today introduces a very detailed summary of JVM reflection principle technical points.

Oct 10, 2020 pm 05:20 PM

JVM反射原理技术

Get to know the pitfalls of Lombok

The java basic tutorial column introduces you to the pitfalls of Lombok, which is easy to use.

Oct 09, 2020 pm 05:00 PM

Lombok

A closer look at the right and wrong ways to start threads in Java

The java basics column introduces the correct and incorrect ways to start threads in Java.

Sep 28, 2020 pm 04:55 PM

Java 启动线程

What is the short confession code in java

Java short confession code: implement a text confession button, the code is [x=msgbox("Would you like to be my girlfriend?",VbYesNo)if x=VbYes then msgbox("Go and get your certificate tomorrow!")].

Sep 27, 2020 pm 03:52 PM

java 表白代码

Share a simple example of java polymorphism

A simple example of Java polymorphism: first create an interface; then create two classes to determine the content of the speech; then print the time while speaking; and finally create a test class to run.

Sep 27, 2020 pm 03:27 PM

java 多态例子

What is the solution to java heap space error

The solution to the java heap space error is: 1. Set the environment variable, the code is [set JAVA_OPTS= -Xms32m -Xmx512m]; 2. Add relevant parameters when executing the JAVA class file, the parameter is [java -Xms32m -Xmx800m cl] .

Sep 27, 2020 pm 03:16 PM

java heap space

How to export EXCEL table from JAVA

How to export an EXCEL table with JAVA: first use HSSFWorkbook to open or create an "Excel file object"; then use the Sheet object to return the row object, and use the row object to get the Cell object; then read and write the Cell object; finally put the generated file into the response Front-end page.

Sep 27, 2020 pm 03:10 PM

java 导出excel

How to match string with java regular expression

How to match strings with java regular expressions: use tostring, the code is [while(matcher.find()){tmp.add(matcher.group(1).toString());}].

Sep 27, 2020 pm 02:55 PM

java 正则表达式匹配字符串

How to open java after installation

How to open java after installation: first configure the JDK path, classpath, [JAVA_HOME] into computer variables; then enter cmd to enter the console, and enter [java -version] in the console; finally write a [java -version] directly locally .java] text file.

Sep 25, 2020 pm 03:54 PM

java