the local variable is never read ошибка в программе Java

import java.io.*;
import java.util.*;

public class lab1_2 {
public static void main(String[] args) {
Scanner in= new Scanner (System.in);
PrintWriter out = new PrintWriter(System.out);
int x1=in.nextInt();
int y1=in.nextInt();
int x2=in.nextInt();
int y2=in.nextInt();
int x3=in.nextInt();
int y3=in.nextInt();
int x4=in.nextInt();
int y4=in.nextInt();
double AB;
double BC;
double CD;
double DA;
double DB;
double Sabd;
double Sbcd;
double P;
double P1;
double S;
AB=Math.sqrt(((x2-x1)*(x2-x1))+((y2-y1)*(y2-y1)));
BC=Math.sqrt(((x3-x2)*(x3-x2))+((y3-y2)*(y3-y2)));
CD=Math.sqrt(((x4-x3)*(x4-x3))+((y4-y3)*(y4-y3)));
DA=Math.sqrt(((x4-x1)*(x4-x1))+((y4-y1)*(y4-y1)));
DB=Math.sqrt(((x4-x2)*(x4-x2))+((y4-y2)*(y4-y2)));
P=(DA+AB+DB)/2;
P1=(BC+CD+DB)/2;
Sabd=Math.sqrt((P*(P-DA)*(P-AB)*(P-DB)));
Sbcd=Math.sqrt((P1*(P1-BC)*(P1-CD)*(P1-DB)));
S=Sabd+Sbcd;
System.out.println("ploshcha 4otupukytnuka ABCD =" +S );

}

}

Вот код моей программы в строке "PrintWriter out = new PrintWriter(System.out);" пишет ошибку the local variable is never read в чём проблема? подскажите