Jbutton problem

[blue50]

I cannot get a JButton to resize...can anyone tell me what is wrong with using Button1.setBounds(1,1,2,2);...below is the class file...it is called from another file...it gives and error that I posted after the code

import java.awt.*;
import javax.swing.*;											//this is required for gui layout
import java.awt.event.ActionListener;						//this is required for the buttons to work
import java.awt.event.ActionEvent;							//this is required for the buttons to work

public class UserInterfaceSetup implements ActionListener	//This creates a new class that generates a calculator
{
//Initialize objects to be placed on the screen...and initialize the screen and panel to put stuff on
	JFrame frame = new JFrame("UserInterface");				//This creates the window that the calculator is in and puts the text "calculater" in the top bar of the window (still must be placed later)
	JPanel Panel1 = new JPanel();			//This creates a new panel for putting things on that is inside of the JFrame or window whatever you want to call it (still must be placed later)
   //Panel1.setLayoutManager(null);
	JTextArea TextEntry1 = new JTextArea(1,20);					//This creates a text entry area for entering numbers for the calculator (still must be placed later) 
	
	JButton Button1 = new JButton("1");							//This creates a button with a label of 1 (still must be placed later) 
	Button1.setBounds(1,1,2,2);
	double number1,number2,result;
	int addc=0,subc=0,multic=0,divc=0;
	
	public void ui()
	{
		frame.setVisible(true);									//this makes the frame(window) visible on the desktop
		frame.setSize(250,200);									//this sets the size of the frame on the desktop in pixels
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//this tells frame what to do when close button is clicked
		
		frame.add(Panel1);											//This adds the panel to the frame on the desktop
			
	   Panel1.add(TextEntry1);										//this places the text entry box on the panel
		
	   Panel1.add(Button1);											//this places the button on the panel
		
		Button1.addActionListener(this);							//adds button to the list of items to watch...in "this" instance of the class
	


} //end of ui method

	public void actionPerformed(ActionEvent e) 			//this method occurs if an action occurs
		{
			Object source = e.getSource();					//this line checks to see what the source of the action was
		
			
			if(source==Button1)										//if the source was button 1 then
			{												
				TextEntry1.setText(Double.toString(result));
				TextEntry1.append("1");									//append a 1 to the text field value
			}
			
			number2 = number_reader();
								
			
		}// end of actionPerformed method
				
		public double number_reader()							//create a method that converts strings to integers
		{
			Double num1;											//create a double precision number
			String s;												//create a string variable
			s=TextEntry1.getText();										//get the text from the text entry box
			num1=Double.valueOf(s);								//convert the text to a double precision number and store it to num1
			
			return num1;											//pass num1 back to whatever calls this method
		}

}//end of calculater_ui Class

UserInterfaceSetup.java:15: <identifier> expected
Button1.setBounds(1,1,2,2);
^
UserInterfaceSetup.java:15: illegal start of type
Button1.setBounds(1,1,2,2);
^
UserInterfaceSetup.java:15: illegal start of type
Button1.setBounds(1,1,2,2);
^
UserInterfaceSetup.java:15: illegal start of type
Button1.setBounds(1,1,2,2);
^
UserInterfaceSetup.java:15: illegal start of type
Button1.setBounds(1,1,2,2);
^
UserInterfaceSetup.java:15: package Button1 does not exist
Button1.setBounds(1,1,2,2);
^
6 errors

[blue50]

supposedly I am supposed to set the layout manager to null before that will work...but that code also failed with a similar error so I commented it out

Panel1.setLayoutManager(null);

So Any help is appreciated

[JosAH]

UserInterfaceSetup.java:15: <identifier> expected
	Button1.setBounds(1,1,2,2);
	                 ^
UserInterfaceSetup.java:15: illegal start of type
	Button1.setBounds(1,1,2,2);
	                  ^
UserInterfaceSetup.java:15: illegal start of type
	Button1.setBounds(1,1,2,2);
	                    ^
UserInterfaceSetup.java:15: illegal start of type
	Button1.setBounds(1,1,2,2);
	                      ^
UserInterfaceSetup.java:15: illegal start of type
	Button1.setBounds(1,1,2,2);
	                        ^
UserInterfaceSetup.java:15: package Button1 does not exist
	Button1.setBounds(1,1,2,2);
	       ^
6 errors

You can't put ordinary statements outside the body of a method; only member variable definitions (and optional initialization expressions) can be outside a method body.

kind regards,

Jos

[blue50]

So where should I put it?

[JosAH]

So where should I put it?

Inside a method or constructor body?

kind regards,

Jos

[blue50]

ok I see what you are saying...I put the Button1.setBounds(30,50,50,20); in the ui method and now it compiles...but the button is still not being put at the coordinate...it still behaves like it is in flow layout...any help is appreciated.

import java.awt.*;
import javax.swing.*;											//this is required for gui layout
import java.awt.event.ActionListener;						//this is required for the buttons to work
import java.awt.event.ActionEvent;							//this is required for the buttons to work

public class UserInterfaceSetup implements ActionListener	//This creates a new class that generates a calculator
{
			//Initialize objects to be placed on the screen...and initialize the screen and panel to put stuff on
	JFrame frame = new JFrame("UserInterface");				//This creates the window that the calculator is in and puts the text "calculater" in the top bar of the window (still must be placed later)
	JPanel Panel1 = new JPanel();			//This creates a new panel for putting things on that is inside of the JFrame or window whatever you want to call it (still must be placed later)
   
	JTextArea TextEntry1 = new JTextArea(1,20);					//This creates a text entry area for entering numbers for the calculator (still must be placed later) 
	
	JButton Button1 = new JButton("1");							//This creates a button with a label of 1 (still must be placed later) 

	
	double number1,number2,result;
	int addc=0,subc=0,multic=0,divc=0;
	
	public void ui()
	{
		frame.setVisible(true);									//this makes the frame(window) visible on the desktop
		frame.setSize(250,200);									//this sets the size of the frame on the desktop in pixels
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//this tells frame what to do when close button is clicked
		
		frame.add(Panel1);											//This adds the panel to the frame on the desktop
	   Panel1.add(TextEntry1);										//this places the text entry box on the panel
		
	   Panel1.add(Button1);											//this places the button on the panel
		Button1.setBounds(30,50,50,20);
		Button1.addActionListener(this);							//adds button to the list of items to watch...in "this" instance of the class

   } //end of ui method

	public void actionPerformed(ActionEvent e) 			//this method occurs if an action occurs
		{
			Object source = e.getSource();					//this line checks to see what the source of the action was
		
			
			if(source==Button1)										//if the source was button 1 then
			{												
				TextEntry1.setText(Double.toString(result));
				TextEntry1.append("1");									//append a 1 to the text field value
			}
			
			number2 = number_reader();
								
			
		}// end of actionPerformed method
				
		public double number_reader()							//create a method that converts strings to integers
		{
			Double num1;											//create a double precision number
			String s;												//create a string variable
			s=TextEntry1.getText();										//get the text from the text entry box
			num1=Double.valueOf(s);								//convert the text to a double precision number and store it to num1
			
			return num1;											//pass num1 back to whatever calls this method
		}

}//end of calculater_ui Class

[blue50]

putting Panel1.setLayoutManager(null); still gives an error even when I put it in the method

UserInterfaceSetup.java:22: cannot find symbol
symbol : method setLayoutManager(<nulltype>)
location: class javax.swing.JPanel
Panel1.setLayoutManager(null);
^
1 error

[JosAH]

putting Panel1.setLayoutManager(null); still gives an error even when I put it in the method

UserInterfaceSetup.java:22: cannot find symbol
symbol : method setLayoutManager(<nulltype>)
location: class javax.swing.JPanel
Panel1.setLayoutManager(null);
^
1 error

That error is caused by something else completely; the compiler is trying to tell you that it can't find a method 'setLayoutManager'. Check your API documentation for the correct name.

kind regards,

Jos

[blue50]

yea you are right it should have been
Panel1.setLayout(null);
now it works....Thanks! sorry for the stupid questions

Just in case someone else has these problems here is the code...

there are two files
UserInterface.java ...this is where main is that calls the user interface class
UserInterfaceSetup.java ...this is where the class is that builds the ui


UserInterface.java

public class UserInterface extends UserInterfaceSetup
{
	public static void main(String[] args)
	{
		UserInterfaceSetup n = new UserInterfaceSetup();
		n.ui();

	}

}

UserInterfaceSetup.java

import java.awt.*;														//for some of the ui layout parts
import javax.swing.*;													//this is required for gui layout
//import java.awt.event.ActionListener;							//this is included in java.awt.* I am just being verbose.
//import java.awt.event.ActionEvent;								//this is included in java.awt.* I am just being verbose.

public class UserInterfaceSetup implements ActionListener	//This creates is used to create a userinterface...that uses a listener for user input.
{
	/////////Initialize objects to be placed on the screen...and initialize the screen and panel to put stuff on
	JFrame frame = new JFrame("UserInterface");					//This creates the window that the calculator is in and puts the text "calculater" in the top bar of the window (still must be placed later)
	JPanel Panel1 = new JPanel();		                     	//This creates a new panel for putting things on that is inside of the JFrame or window whatever you want to call it (still must be placed later)
   JTextArea TextEntry1 = new JTextArea(1,20);					//This creates a text entry area for entering numbers for the calculator (still must be placed later) 
	JButton Button1 = new JButton("1");								//This creates a button with a label of 1 (still must be placed later) 

	////////////Initialize global variables for use
	double number1,number2,result;
	int someinteger1 = 0;

////ui method is for defining the look of the ui////////////////////////////////////////////////////////////////////	
	public void ui() 		//this method holds the ui placement and visibility information
	{
		Panel1.setLayout(null);										//set the Panel1 layout type to null so we can type coordinates of buttons and other objects
		frame.setVisible(true);										//this makes the frame(window) visible on the desktop
		frame.setSize(250,200);										//this sets the size of the frame on the desktop in pixels
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);//this tells frame what to do when close button is clicked
		frame.add(Panel1);											//This adds the panel to the frame on the desktop
	   Panel1.add(TextEntry1);										//this places the text entry box on the panel
		TextEntry1.setBounds(30,30,50,20);
	   Panel1.add(Button1);											//this places the button on the panel
		Button1.setBounds(30,50,50,20);
		
		//list actions to be listened for by actionpferformed
		Button1.addActionListener(this);							//adds button to the list of items to watch...in "this" instance of the class
																			//meaning add an actionlistner to the button that is generated by this method
   } //end of ui method
//////////////That is the end of the description on how the ui should look/////////////////////////////////////////////

/////This is where we tell the program what to do if an even occurs///////////////////////////////////////////////////
	public void actionPerformed(ActionEvent e) 				//this method occurs if an action occurs
		{
			Object source = e.getSource();						//this line checks to see what the source of the action was
			
			if(source==Button1)										//if the source was button 1 then
			{												
				TextEntry1.setText(Double.toString(result)); //set the text in the text box to whatever 
				TextEntry1.append("1");								//append a 1 to the text field value
			}
			
			number2 = number_reader();								//this gets a number returned by the number_reader() function
		}// end of actionPerformed method
/////////That was where we told the program what to do if there is an event///////////////////////////////////////////			

/////////This is a method that shows how to return a varibale//////////////////////////////////////////////////////////
		public double number_reader()							//create a method that converts strings to integers
		{
			Double num1;											//create a double precision number
			String s;												//create a string variable
			s=TextEntry1.getText();								//get the text from the text entry box
			num1=Double.valueOf(s);								//convert the text to a double precision number and store it to num1
			
			return num1;											//pass num1 back to whatever calls this method
		}

}//end of UserInterfaceSetup Class

Thanks again for the help

sorry about the comment tabs this thing does not like those they look bad in here.

[JosAH]

yea you are right it should have been
Panel1.setLayout(null);
now it works....Thanks! sorry for the stupid questions

You're welcome and no need to say sorry; the lesson was: always keep the API documenation handy, it'll save you from guesswork. The facts are in that documentation.

kind regards,

Jos

[DarrylBurke]

1. Unless you are dragging components at runtime, there's never a need to use a null layout. Use a layout manager that suits your need, or even a combination of layout managers in nested panels.
2. Get rid of those godawful ugle comment lines. Learn the conventions.
Code Conventions for the Java(TM) Programming Language: Contents

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