Quick else if error question

Question

I am getting an else if error, and I have no clue why. Can somebody help me out? Thanks in advance!
PrimaryColors.java:71: 'else' without 'if'
          else if(buttonString.equals("Blue"));
PrimaryColors.java:73: 'else' without 'if'
          else if(buttonString.equals("Red"));
PrimaryColors.java:75: 'else' without 'if'
          else
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JButton;
import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.FlowLayout;
import java.awt.Color;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
public class PrimaryColors extends JFrame implements ActionListener
     public static final int WIDTH = 300;
     public static final int HEIGHT = 200;
     private JPanel yellowPanel;
     private JPanel bluePanel;
     private JPanel redPanel;
     public PrimaryColors()
          super("Primary Colors");
          setSize(WIDTH, HEIGHT);
          setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          setLayout(new BorderLayout());
          JPanel biggerPanel = new JPanel();
          biggerPanel.setLayout(new GridLayout(3, 1));
          yellowPanel = new JPanel();
          yellowPanel.setBackground(Color.BLACK);
          biggerPanel.add(yellowPanel);
          bluePanel = new JPanel();
          bluePanel.setBackground(Color.BLACK);
          biggerPanel.add(bluePanel);
          redPanel = new JPanel();
          redPanel.setBackground(Color.BLACK);
          biggerPanel.add(redPanel);
          add(biggerPanel, BorderLayout.CENTER);
          JPanel buttonPanel = new JPanel();
          buttonPanel.setBackground(Color.BLACK);
          buttonPanel.setLayout(new FlowLayout());
          JButton yellowButton = new JButton("Yellow");
          yellowButton.setBackground(Color.YELLOW);
          yellowButton.addActionListener(this);
          buttonPanel.add(yellowButton);
          JButton blueButton = new JButton("Blue");
          blueButton.setBackground(Color.BLUE);
          blueButton.addActionListener(this);
          buttonPanel.add(blueButton);
          JButton redButton = new JButton("Red");
          redButton.setBackground(Color.RED);
          redButton.addActionListener(this);
          buttonPanel.add(redButton);
          add(buttonPanel, BorderLayout.WEST);
     public void actionPerformed(ActionEvent e)
          String buttonString = e.getActionCommand();
          if(buttonString.equals("Yellow"));
               yellowPanel.setBackground(Color.YELLOW);
          else if(buttonString.equals("Blue"));
               bluePanel.setBackground(Color.BLUE);
          else if(buttonString.equals("Red"));
               redPanel.setBackground(Color.RED);
          else
               System.out.println("Unexpected error");
     public static void main(String[] args)
          PrimaryColors gui = new PrimaryColors();
          gui.setVisible(true);
}

Answer 1

Get into the habit of always using braces around if's and loops. Consider the following.
if(condition)
    firstLine;
else
    anotherLine;Then later you need to change to code.
if(condition)
    firstLine;
    secondLine; //always executed
else // error else without if
    anotherLine;By not using braces in the first place can lead to errors if you forget to include then when the code changes.