引用在 Java 中使用第三方库的类

Question

I have a class which uses a import from third-party library

import org.apache.commons.lang3.*;        
public  class test2 {
    public void printing() {
        System.out.println(StringUtils.capitalize("hello test2"));
    }
    public static void main(String[] args) {}
}

I have a second class in the same directory

public class test {
    public static void main(String[] args) {
        System.out.println("hello test1");
        test2 t = new test2();
        t.printing();
    }
}

I have tried compiling using these commands

cmd> javac -cp "./lib/commons.jar" test.java
cmd> javac test.java

but both gives an error : error: cannot find symbol test2 t = new test2();

How will I be able to reference a class that uses a third-party library

Note: the first-class compiles separate on its own without problems.also compiles if i remove importing external jar from first class .the external jar file is in lib folder in the same directory

link for .jar I used: https://www-us.apache.org/dist//commons/lang/binaries/commons-lang3-3.9-bin.zip

Answer 1

Above is my folder structure and compiled classes.

I have slightly Change your test2.java file here is the updated code

import org.apache.commons.lang3.*;        
public class test2 {
    public void printing() {
        System.out.println(StringUtils.capitalize("hello test2"));
    }
}

and here is the command javac -cp "lib/common-lang3.jar" test2.java let me know if this doesn't work even javac test.java is also working