[SOLVED] Java Compile error

exvor · 10-06-2011, 07:36 PM

Hello guys;

I am working on this program for class and I am getting a strange error when trying to compile it. It keeps saying that a ] is expected on line 14 but I have a ] on line 14? I am sure this is something to do with accessing JLabel objects with an array but I am unsure.

Normally I would not ask here for class related stuff but this one has me stumped so any help or pointers to find the solution would be helpful.

Code:

import javax.swing.*; 
import java.awt.*; 
import java.awt.event.*; 

public class JDemoResistance extends JFrame implements ActionListener
{

	JLabel[] option = new JLabel[6]; 
	final int WIDTH = 250; 
	final int HEIGHT = 120; 
	final String CLEAR = ""; 
	int count = 0; 
	JButton but1 = new JButton("Remove Option"); 
	option[5] = new JLabel("Remove all that do not apply"); 
	option[4] = new JLabel("Makes no sense");
	option[3] = new JLabel("Not Enough CREEPERS!");
	option[2] = new JLabel("Should include cat ninjas");
	option[1] = new JLabel("Too many bugs"); 
	option[0] = new JLabel("Too bright in dark areas"); 
	    
	public JDemoResistance()
	{
		super("JDemoResistance"); 
		setSize(WIDTH,HEIGHT); 
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
		setLayout(new FlowLayout()); 
		
		option[6].setFont(new Font("Arial",Font.BOLD,22); 
		for(int i = 5; i < 0, i--) //add all elements of the array to the Frame
		{
			add(option[i]); 
		}
		
		add(but1); // add button to the Frame 
		
		
		but1.addActionListener(this); // capture events and execute actionPerformed
		
		
		 
	}
	public static void main(String[] args) 
	{
	
		JDemoResistance myStuff = new JDemoResistance(); 
		myStuff.setVisible(true) 	
		 
	} 
	
	
	public void actionPerformed(ActionListener a)
	{
		if (count < 4) // prevent removing last item and informative label 
		{
			option[count].setText(CLEAR); // clear label at count number 
			
		}
		
		count++; 
		 
	}
}

exvor · 10-06-2011, 08:03 PM

Never mind I fixed the issue. I moved my elements that created the array elements and put them into the constructor for the class. It works this way and I think the reason is because the object has to be created before I can access the array elements but this may not be correct. Also I was unable to use the for loop to add the JLabel Objects to the JFrame object? This may be something thats discussed in the next chapter of my book I will have to see.... Below is the working code I settled with for the assignment which I will submit.

Code:

import javax.swing.*; 
import java.awt.*; 
import java.awt.event.*; 

public class JDemoResistance extends JFrame implements ActionListener
{

	JLabel[] option = new JLabel[5]; 
	final int WIDTH = 250; 
	final int HEIGHT = 120; 
	final String CLEAR = ""; 
	int count = 0; 
	JButton but1 = new JButton("Remove Option"); 

	    
	public JDemoResistance()
	{
		super("JDemoResistance"); 
		setSize(WIDTH,HEIGHT); 
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
		setLayout(new FlowLayout()); 
		option[4] = new JLabel("Makes no sense");
	   option[3] = new JLabel("Not Enough CREEPERS!");
	   option[2] = new JLabel("Should include cat ninjas");
	   option[1] = new JLabel("Too many bugs"); 
	   option[0] = new JLabel("Too bright in dark areas"); 
		
		add(but1); // add button to the Frame 
		add(option[4]); 
		add(option[3]); 
		add(option[2]); 
		add(option[1]); 
		add(option[0]); 
		
	
		
		but1.addActionListener(this); // capture events and execute actionPerformed
		
		
		 
	}
	
	public void actionPerformed(ActionEvent a)
	{
		if (count < 4) // prevent removing last item and informative label 
		{
			option[count].setText(CLEAR); // clear label at count number 
			
		}
		
		count++; 
		 
	}
	public static void main(String[] args) 
	{
	
		JDemoResistance myStuff = new JDemoResistance(); 
		myStuff.setVisible(true); 	
		 
	} 
	
	
	
}