Please take a look at this code and help with the compile error
I have two classes but the Multilateration class will not compile because of compile error
ompiling 1 source file to C:\Users\Justin\Documents\NetBeansProjects\JavaApplication2\build\classes
C:\Users\Justin\Documents\NetBeansProjects\JavaApplication2\src\Multilateration.java:9: non-static method getValue(int) cannot be referenced from a static context
double ti = OrgData.getValue(sel), tk = OrgData.getValue(sel+1), tj = OrgData.getValue(sel+2), tl = OrgData.getValue(sel+3);
^
C:\Users\Justin\Documents\NetBeansProjects\JavaApplication2\src\Multilateration.java:9: non-static method getValue(int) cannot be referenced from a static context
double ti = OrgData.getValue(sel), tk = OrgData.getValue(sel+1), tj = OrgData.getValue(sel+2), tl = OrgData.getValue(sel+3);
^
C:\Users\Justin\Documents\NetBeansProjects\JavaApplication2\src\Multilateration.java:9: non-static method getValue(int) cannot be referenced from a static context
double ti = OrgData.getValue(sel), tk = OrgData.getValue(sel+1), tj = OrgData.getValue(sel+2), tl = OrgData.getValue(sel+3);
^
C:\Users\Justin\Documents\NetBeansProjects\JavaApplication2\src\Multilateration.java:9: non-static method getValue(int) cannot be referenced from a static context
double ti = OrgData.getValue(sel), tk = OrgData.getValue(sel+1), tj = OrgData.getValue(sel+2), tl = OrgData.getValue(sel+3);
^
4 errors
The Orgdata class compiles fine.
The Multilateration class invokes the getValue method of Orgdata which accesses a simple mysql database and gets the three time values with respect to the rNum which is just an incrementer used to locate the values in the database.
Can someone please have a look
import java.lang.Math;public class Multilateration { void calcCord(int sel) { double ti = OrgData.getValue(sel), tk = OrgData.getValue(sel+1), tj = OrgData.getValue(sel+2), tl = OrgData.getValue(sel+3); double xi = -8, xk = 15338349, xj = 0, xl = 2656680; double yi = 21482069, yk = 15338349, yj = 6380000, yl = 0; double zi = 3683495, zk = 15338349, zj = 25789348, zl=0; double xji=xj-xi; double xki=xk-xi; double xjk=xj-xk; double xlk = xl-xk; double xik=xi=xk; double yji=yj-yi; double yki=yk-yi; double yjk=yj-yk; double ylk=yl-yk; double yik=yi-yk; double zji=zj-zi; double zki=zk-zi; double zik=zi-zk; double zjk=zj-zk; double zlk=zk; double rij=Math.abs((10*(ti-tj))/33); double rik=Math.abs((10*(ti-tk))/33); double rkj=Math.abs((10*(tk-tj))/33); double rkl=Math.abs((10*(tk-tl))/33); double s9=rik*xji-rij*xki; double s10=rij*yki-rik*yji; double s11=rik*zji-rij*zki; double s12=(rik*(rij*rij+xi*xi-xj*xj+yi*yi-yi*yj+zi*zi-zj*zj) -rij*(rik*rik+xi*xi-xk*xk+yi*yi-yk*yk+zi*zi-zk*zk))/2; double s13=rkl*xjk-rkj*xlk; double s14=rkj*ylk-rkl*yjk; double s15=rkl*zjk-rkj*zlk; double s16=(rkl*(rkj*rkj+xk*xk-xj*xj+yk*yk+zk*zk-zj*zj) -rkj*(rkl*rkl+xk*xk-xl*xl+yk*yk-yl*yl+zk*zk-zl*zl))/2; double a=s9/s10; double b=s11/s10; double c=s12/s10; double d=s13/s14; double e=s15/s14; double f=s16/s14; double g=(e-b)/(a-d); double h=(f-c)/(a-d); double i=(a*g)+b; double j=(a*h)+c; double k=rik*rik+xi*xi-xk*xk+yi*yi-yk*yk+zi-zk*zk+2*j*yki; double l=2*(g*xki+i*yki+zki); double m=4*rik*rik*(g*g+i*i+l)-l*l; double n=8*rik*rik*(g*(xi-h)+i*(yi-j)+zi)+2*l*k; double o=4*rik*rik*((xi-h)*(xi-h)+(yi-j)*(yi-j)+zi*zi)-k*k; double s28=n/(2*m); double s29=(o/m); double s30=(s28*s28)-s29; double root=Math.sqrt(s30); System.out.println(); int z1=(int)(s28+root); System.out.println("z = "+ z1 + "\n"); int z2=(int)(s28-root); // System.out.println("z1 = "+z2+"\n"); int x1=(int)(g*z1+h); System.out.println("x = "+x1+"\n"); int x2=(int)(g*z2+h); // System.out.println("x2 = "+x2 +"\n"); int y1=(int)(a*x1+b*z1+c); System.out.println("y = " + y1 + "\n"); int y2=(int)(a*x2+b*z2+c); // System.out.println("y2 = " +y2 + "\n"); } }import java.sql.Connection;import java.sql.DriverManager;import java.sql.ResultSet;import java.sql.SQLException;import java.sql.Statement;public class OrgData { int a, b; final String JDBC_DRIVER = "com.mysql.jdbc.Driver"; final String DATABASE_URL = "jdbc:mysql://localhost:3306/rfiddata"; Connection connection = null; // manages connection int getValue(int rNum) { try { Class.forName(JDBC_DRIVER); // load database driver class // establish connection to database connection = DriverManager.getConnection(DATABASE_URL, "root", ""); // create Statement for querying database Statement statement = connection.createStatement(); ResultSet rs1 = statement.executeQuery("select time from rfid where rnum=sel"); a = rs1.getInt("time"); return a; } // end try catch (SQLException sqlException) { sqlException.printStackTrace(); System.exit(1); } // end catch catch (ClassNotFoundException classNotFound) { classNotFound.printStackTrace(); System.exit(1); } // end catch finally // ensure statement and connection are closed properly { try { connection.close(); } // end try catch (Exception exception) { exception.printStackTrace(); System.exit(1); } // end catch } // end finally return 0; } // end main}// end class
Thank you.
I created an instance and it compiles.
Can you please take a look at my code. Is this the best way to get a value from another class with regarding the constructor.
I created an instance and it compiles.
Can you please take a look at my code. Is this the best way to get a value from another class with regarding the constructor.
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