Manually import Java library, JDSP, and cannot use JDSP built-in functions

Processing Libraries
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Yes, my problem has been solved.
Thank you, I am very touched by your warm help.
In addition, your optimism and positive learning have forced me to reflect on my own perceptions, and you are my teacher to me.
However, I still have a question. Why does using import all of jdsp prompt?

The type Butterworth is ambiguous

Like this.

import com.github.psambit9791.jdsp.misc.*;
import com.github.psambit9791.jdsp.io.*;
import com.github.psambit9791.jdsp.speech.*;
import com.github.psambit9791.jdsp.splines.*;
import com.github.psambit9791.jdsp.filter.*;
import com.github.psambit9791.jdsp.filter.adaptive.*;
import com.github.psambit9791.jdsp.windows.*;
import com.github.psambit9791.jdsp.transform.*;
import com.github.psambit9791.jdsp.signal.*;
import com.github.psambit9791.jdsp.signal.peaks.*;
//import com.github.psambit9791.jdsp.filter.Butterworth; // Specific import for Butterworth
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