Non-static method 'getidentity()' cannot be referenced from a static context

在Java中，`@Data`注解由Lombok提供，它通常用于简化POJO（Plain Old Java Object）类的创建，包括自动生成equals(), hashCode(), toString(), getters和setters方法。然而，当在具有继承结构的类中使用`@Data`时，可能会遇到一些限制。例如，如果子类重写了父类的方法但没有显式声明为`static`，那么Lombok默认生成的equals和hashCode方法可能不会满足预期，因为它们是静态方法[^1]。

具体来说，在`Person`类中，如果你试图访问非静态方法`getIdentity()`，在静态上下文中就会抛出错误，因为静态方法不能直接引用非静态成员（如实例方法）。如果你想在静态方法中操作`Person`类的属性，你可能需要提供一个公共的getter方法并调用它，或者将`getIdentity()`方法标记为`static`：

@Data
class Person {
    private String name;
    private String identity;

    // 如果你想在静态上下文中访问identity，可以这样：
    public static String getIdentityFromInstance(Person person) {
        return person.getIdentity();
    }
}

相关问题

#include "black.h" #include<iostream> using namespace std; class black { int chessman_X; //横向位置 int chessman_Y; //纵向位置 int black_chessman_count; //落子总数 int black_chessmanplayer; public: black() { black_chessman_count = 0; black_chessmanplayer = -1; } bool submit_chessman(int chessman_X, int chessman_Y) { if (chessman_X > 15 || chessman_X < 1 || chessman_Y>15 || chessman_Y < 1) { return false; } else { this->chessman_X = chessman_X; this->chessman_Y = chessman_Y; black_chessman_count++; return true; } } int getIdentity() { return black_chessmanplayer; } int getChessman_X() { return chessman_X - 1; //这里设置减一是因为画图从0位置开始 } int getChessman_Y() { return chessman_Y - 1; } int getChessmanCount() { return black_chessman_count; } }; 根据这个CPP写出.h

#ifndef BLACK_H
#define BLACK_H

class black
{
private:
int chessman_X; //横向位置
int chessman_Y; //纵向位置
int black_chessman_count; //落子总数
int black_chessmanplayer;

public:
black();
bool submit_chessman(int chessman_X, int chessman_Y);
int getIdentity();
int getChessman_X();
int getChessman_Y();
int getChessmanCount();
};

#endif // BLACK_H

给下列程序添加英文注释：bool MoveBase::getRobotPose(geometry_msgs::PoseStamped& global_pose, costmap_2d::Costmap2DROS* costmap) { tf2::toMsg(tf2::Transform::getIdentity(), global_pose.pose); geometry_msgs::PoseStamped robot_pose; tf2::toMsg(tf2::Transform::getIdentity(), robot_pose.pose); robot_pose.header.frame_id = robot_base_frame_; robot_pose.header.stamp = ros::Time(); // latest available ros::Time current_time = ros::Time::now(); // save time for checking tf delay later // get robot pose on the given costmap frame try { tf_.transform(robot_pose, global_pose, costmap->getGlobalFrameID()); } catch (tf2::LookupException& ex) { ROS_ERROR_THROTTLE(1.0, "No Transform available Error looking up robot pose: %s\n", ex.what()); return false; } catch (tf2::ConnectivityException& ex) { ROS_ERROR_THROTTLE(1.0, "Connectivity Error looking up robot pose: %s\n", ex.what()); return false; } catch (tf2::ExtrapolationException& ex) { ROS_ERROR_THROTTLE(1.0, "Extrapolation Error looking up robot pose: %s\n", ex.what()); return false; } // check if global_pose time stamp is within costmap transform tolerance if (current_time.toSec() - global_pose.header.stamp.toSec() > costmap->getTransformTolerance()) { ROS_WARN_THROTTLE(1.0, "Transform timeout for %s. " \ "Current time: %.4f, pose stamp: %.4f, tolerance: %.4f", costmap->getName().c_str(), current_time.toSec(), global_pose.header.stamp.toSec(), costmap->getTransformTolerance()); return false; } return true; }

// Function to get the robot pose in the given costmap frame
bool MoveBase::getRobotPose(geometry_msgs::PoseStamped& global_pose, costmap_2d::Costmap2DROS* costmap) {
// Set the global pose to the identity transform
tf2::toMsg(tf2::Transform::getIdentity(), global_pose.pose);
// Create a new pose for the robot and set it to the identity transform
geometry_msgs::PoseStamped robot_pose;
tf2::toMsg(tf2::Transform::getIdentity(), robot_pose.pose);
// Set the frame ID for the robot pose to the robot base frame
robot_pose.header.frame_id = robot_base_frame_;
// Set the time stamp for the robot pose to the latest available time
robot_pose.header.stamp = ros::Time(); // latest available
// Save the current time for checking the tf delay later
ros::Time current_time = ros::Time::now(); // save time for checking tf delay later

// Get the robot pose on the given costmap frame
try
{
tf_.transform(robot_pose, global_pose, costmap->getGlobalFrameID());
}
catch (tf2::LookupException& ex)
{
// If the transform lookup fails, print an error message and return false
ROS_ERROR_THROTTLE(1.0, "No Transform available Error looking up robot pose: %s\n", ex.what());
return false;
}
catch (tf2::ConnectivityException& ex)
{
// If there is a connectivity error, print an error message and return false
ROS_ERROR_THROTTLE(1.0, "Connectivity Error looking up robot pose: %s\n", ex.what());
return false;
}
catch (tf2::ExtrapolationException& ex)
{
// If there is an extrapolation error, print an error message and return false
ROS_ERROR_THROTTLE(1.0, "Extrapolation Error looking up robot pose: %s\n", ex.what());
return false;
}

// Check if the time stamp of the global pose is within the costmap transform tolerance
if (current_time.toSec() - global_pose.header.stamp.toSec() > costmap->getTransformTolerance())
{
// If the time stamp is outside the tolerance, print a warning and return false
ROS_WARN_THROTTLE(1.0, "Transform timeout for %s. " \
"Current time: %.4f, pose stamp: %.4f, tolerance: %.4f", costmap->getName().c_str(),
current_time.toSec(), global_pose.header.stamp.toSec(), costmap->getTransformTolerance());
return false;
}

// Return true if the robot pose was successfully retrieved
return true;
}