VSCode无法导入外部库

Question

我目前正在尝试学习 VSCode。我现在使用 VSCode 在 Java 11 中进行编程。在下面的示例代码中，有 4 行导入。其中前两个正在工作。但接下来的两个给出了以下错误。

package app;

import java.util.*;
import java.awt.*;
import com.google.common.primitives.Ints;
import org.apache.commons.collections.iterators.ArrayIterator;

/**
 * Board_Space
 */
public class Board_Space {


}

"The import com.google cannot be resolved. Java(268435846) [5,8]"
"The import org.apache.commons.collections cannot be resolved. Java(268435846) [6,8]"

我该如何解决这个错误以及如何使用任何类型的外部库？

Related Environment Info:

 - OS: Windows 10
 - JDK 11 is installed. JAVA_HOME and PATH environment variables are set.
 - apache-maven-3.6.1 is installed. MAVEN_HOME and M2_HOME environment variables are set.
 - VSCode Version: 1.36.1 (user setup) 
 - VSCode Commit: 2213894ea0415ee8c85c5eea0d0ff81ecc191529


Extensions:

 - Name: Checkstyle for Java / Id: shengchen.vscode-checkstyle
 - Name: Code Spell Checker / Id: streetsidesoftware.code-spell-checker
 - name: Debugger for Java / Id: vscjava.vscode-java-debug
 - Name: Java Dependency Viewer / Id: vscjava.vscode-java-dependency
 - Name: Java Extension Pack / Id: vscjava.vscode-java-pack
 - Name: Java Test Runner / Id: vscjava.vscode-java-test
 - Name: Language Support for Java(TM) by Red Hat / Id: redhat.java
 - Name: Maven for Java / Id: vscjava.vscode-maven
 - Name: Visual Studio IntelliCode / Id: visualstudioexptteam.vscodeintellicode

Answer 1

.classpath添加外部 Jar 文件而不需要为库更改maven 或 gradle文件。

1.创建一个lib在项目中命名的文件夹并将.jar文件添加到其中

2.配置路径如下.classpath：

<classpathentry kind="lib" path="lib/xxxx.jar"/>

3.如果仍然出现错误，请清理工作空间目录：F1- 输入Clean-clean workspace