common errors in java-JavaBase-php.cn

Common Java Errors

1. After configuring Java environment variables, you still cannot use java Order.

common errors in java

Solution:

If this problem occurs on Windows 10 system, it is because some Windows 10 systems do not recognize the "JAVA_HOME" environment variable and change path Change all "%JAVA_HOME%" to the real folder path of the JDK. The environment variables are configured incorrectly. Carefully check whether the JDK folder address is correct. JDK failed to install properly, please reinstall.

2. The correct Java code cannot be run on the console

Java files can be compiled through the javac command, but cannot be run using the java command.

common errors in java

Solution:

If you are using a Windows 10 system, it may be caused by the system security permissions being too high and not allowing the Java virtual machine to operate the C drive. You can put the java file in another drive letter and run it.

The command to enter other drive letters is as follows: (for example, enter the D drive)

common errors in java

3. When generating the document, a javadoc error occurs - Unable Read Input length = 1

common errors in java

Solution:

You may not have selected any outputable Java files in the steps. This problem may be caused by the new version of eclipse itself. Don't worry about this function. This is not a Java technology, it is just a function provided by eclipse. You can continue to learn it later.

4. The 32-bit JDK cannot be found

On the official website, there is only JDK9, but JDK9 only has 64-bit installation packages, not 32-bit ones. What should I do?

common errors in java