#include<windows.h>
#include<iostream>
using namespace std;
void moveMouse(int x, int y) {
    INPUT input;
    input.type = INPUT_MOUSE;
    input.mi.dx = x;
    input.mi.dy = y;
    input.mi.time = 0;
    input.mi.dwFlags = MOUSEEVENTF_MOVE;
    UINT qwe = SendInput(1, &input, sizeof(input));
    cout<< qwe;
}

import com.sun.jna.platform.win32.User32;
import com.sun.jna.platform.win32.WinDef.DWORD;
import com.sun.jna.platform.win32.WinDef.LONG;
import com.sun.jna.platform.win32.WinUser.INPUT;
//import static com.sun.jna.Native.sizeof;//compilation error 'sizeof(int)' has private access in 'com.sun.jna.Native'
import static com.sun.jna.platform.win32.WinUser.INPUT.INPUT_MOUSE;
public class Test {
    public static void main(String[] a) {
        moveMouse(
                1_000L,
                1_000L
        );
    }
    /**
     * @param x change required in x co-ordinate
     * @param y change required in y co-ordinate
     *
     */
    public static void moveMouse(Long x, Long y) {
        INPUT input = new INPUT();
        input.type = new DWORD(INPUT_MOUSE);
        input.input.mi.dx = new LONG(x);
        input.input.mi.dy = new LONG(y);
        input.input.mi.time = new DWORD(0);
        input.input.mi.dwFlags = new DWORD(0x0001L);
        INPUT[] inputArray = {input};
        DWORD result = User32.INSTANCE.SendInput(new DWORD(1), inputArray, input.size());
        // sizeof (used below in the commented code) returns the compilation error
        // 'sizeof(int)' has private access in 'com.sun.jna.Native'
        // I got the idea to use sizeof from another StackOverflow post
//        DWORD result = User32.INSTANCE.SendInput(new DWORD(1), inputArray, sizeof(input));
        System.out.println("result = " + result.longValue());
        System.out.println("size = " + input.size());
    }
}

result = 1
size = 40

public static void moveMouse(Long x, Long y) {
INPUT input = new INPUT();
input.type = new DWORD(INPUT_MOUSE);
input.input.setType("mi");//--------------------------------------added this
input.input.mi.dx = new LONG(x);
input.input.mi.dy = new LONG(y);
input.input.mi.time = new DWORD(0);
input.input.mi.dwFlags = new DWORD(0x0001L);
INPUT[] inputArray = {input};
DWORD result = User32.INSTANCE.SendInput(new DWORD(1), inputArray, input.size());
}