Making a conversion program, it errors at my else if statements ')' expected and my jlabel setText isnt working either.. bunch of errors

ok so i took out the beginnig which was just labeling them.. it keeps erroring near my if else statements and also my settext statments? says ")" expected and illegal start of epression for if else. im new to this and confused any help would be appreciated. also, for this im supposed to be using parametres, the lesson i got barely explains what that is.. so any help.. thank you

    inches = Double.parseDouble(jTextField2.getText()); // get txt from txtfield to show te value
     feet = Double.parseDouble(jTextField2.getText());
     yards = Double.parseDouble(jTextField2.getText());
      metres = Double.parseDouble(jTextField2.getText());
    //choose conversions 1-4
    //conv1
     String textfieldinput = jTextField1.getText(); //getting txt and making it check if equal

    if(textfieldinput.equals("1"))
    centimetres = inches*2.54;
    jLabel8.setText( inches + "inches" + " = " + inches*2.54 "cm");

    //conv2
     if else (textfieldinput.equals("2")) 
    centimetres = feet*30;
    jLabel8.setText(feet + "feet" + " = " + feet*30 "cm");

    //conv3
     if else (textfieldinput.equals("3"))
           metres = yards*0.91;
      jLabel8.setText(yards + "yards" + " = " + yards*0.91 "metres");
    //conv4
     if else (textfieldinput.equals("4"))
          kilometres = metres*1.6;
 jLabel8.setText(metres "metres" + " = " + metres*1.6 "km");