如何在 net.biancheng.c 包下，创建一个名为 Grade 的类？

package net.biancheng.c;

import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory;

public class Grade { private static final Log LOGGER = LogFactory.getLog(Grade.class); private Integer gradeId; private String gradeName;

public Grade(Integer gradeId, String gradeName) {
    LOGGER.info("正在执行 Course 的有参构造方法，参数分别为：gradeId=" + gradeId + ",gradeName=" + gradeName);
    this.gradeId = gradeId;
    this.gradeName = gradeName;
}

@Override
public String toString() {
    return "Grade{" +
            "gradeId=" + gradeId +
            ", gradeName='" + gradeName + '\'' +
            '}';
}

}