JavaParser如何在CompilationUnit中获取类名

import com.github.javaparser.JavaParser;
import com.github.javaparser.ast.CompilationUnit;
import com.github.javaparser.ast.body.ClassOrInterfaceDeclaration;

CompilationUnit cu = JavaParser.parse(file);

cu.accept(new ClassVisitor(), null);

class ClassVisitor extends VoidVisitorAdapter<Void> {
    @Override
    public void visit(ClassOrInterfaceDeclaration cid, Void arg) {
        String className = cid.getNameAsString();
        System.out.println("Class name: " + className);
        super.visit(cid, arg);
    }
}