Norm Radder

This is a rather old bit of my code copied from the oracle site:
https://docs.oracle.com/javase/tutorial/uiswing/examples/misc/GradientTranslucentWindowDemoProject/src/misc/GradientTranslucentWindowDemo.java


I usually don't go messing around in 10 year old working code to bring it up to current techniques and standards.

What has changed?

Thank you Stephan.
I did not understand what was happening.  
Now with a little logic in the mouse listener code, the frame can  be moved to y of -100 and it works as desired.  More code and it moves y back into view.

I have a class I use to map over the screen to display where on the screen the mouse was clicked.  It does not trap clicks in the top 80-100 pixels.  Why is there this gap?  I'd like to have 100% of the clicks be trapped.
//https://docs.oracle.com/javase/tutorial/uiswing/misc/trans_shaped_windows.html /* * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * *   - Redistributions of source code must retain the above copyright *     notice, this list of conditions and the following disclaimer. * *   - Redistributions in binary form must reproduce the above copyright *     notice, this list of conditions and the following disclaimer in the *     documentation and/or other materials provided with the distribution. * *   - Neither the name of Oracle or the names of its *     contributors may be used to endorse or promote products derived *     from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ package NormsTools; import java.awt.*; import javax.swing.*; import java.awt.event.*; import static java.awt.GraphicsDevice.WindowTranslucency.*; @SuppressWarnings("serial") public class GradientTranslucentWindow extends JFrame {    public GradientTranslucentWindow(int closeOp) {        super("GradientTranslucentWindow");        setBackground(new Color(0,0,0,0));        if(closeOp == JFrame.DISPOSE_ON_CLOSE) {            setBounds(100, 100, 800, 600);   // <<<< At fixed location For testing<<<<<<        }else {           setSize(new Dimension(800,600));           setLocationRelativeTo(null);        }        setDefaultCloseOperation(closeOp);        JPanel panel = new JPanel() {            @Override            protected void paintComponent(Graphics g) {                if (g instanceof Graphics2D) {                    final int R = 240;                    final int G = 240;                    final int B = 240;                    Paint p = new GradientPaint(0.0f, 0.0f, new Color(R, G, B, 0),                                                0.0f, getHeight(), new Color(R, G, B, 10), true);     // 10 vs 255 Minimal Gradient                    Graphics2D g2d = (Graphics2D)g;                    g2d.setPaint(p);                    g2d.fillRect(0, 0, getWidth(), getHeight());                }                g.setColor(Color.BLACK);                g.drawString(str, xLoc, yLoc);            }        };        setContentPane(panel); //        setLayout(new GridBagLayout()); //        add(new JButton("Here"));        addMouseListener(new MouseListener() {      // How to cover all of screen?            @Override            public void mouseClicked(MouseEvent e) {               System.out.println("mC at relative="+e.getPoint() + ", on screen="+e.getLocationOnScreen());            }            @Override            public void mousePressed(MouseEvent e) {               System.out.println("mP at "+e.getPoint() + ", on screen="+e.getLocationOnScreen());               String text = String.format("X at %3d,%3d", e.getXOnScreen(), e.getYOnScreen());               setText(text, e.getPoint().x, e.getPoint().y);            }            @Override            public void mouseReleased(MouseEvent e) {            }            @Override            public void mouseEntered(MouseEvent e) {            }            @Override            public void mouseExited(MouseEvent e) {            }        });    }    //-------------------------------------------------    int xLoc = 120;    int yLoc = 90;    String str = "X at 120,90";    void setText(String text, int x, int y) {      xLoc = x - 6;         // move to center of X      yLoc = y - 20;      str = text;      repaint();    }    public static void main(String[] args) {        // Determine what the GraphicsDevice can support.        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();        GraphicsDevice gd = ge.getDefaultScreenDevice();        boolean isPerPixelTranslucencySupported = gd.isWindowTranslucencySupported(PERPIXEL_TRANSLUCENT);        //If translucent windows aren't supported, exit.        if (!isPerPixelTranslucencySupported) {            System.out.println("Per-pixel translucency is not supported");                System.exit(0);        } //        JFrame.setDefaultLookAndFeelDecorated(true);        // Create the GUI on the event-dispatching thread        SwingUtilities.invokeLater(new Runnable() {            @Override            public void run() {                JFrame.setDefaultLookAndFeelDecorated(true);                GradientTranslucentWindow gtw = new GradientTranslucentWindow(JFrame.EXIT_ON_CLOSE);                // Display the window.                gtw.setVisible(true);            }        });    } }

I store very little of my stuff on the C: drive.  I've partitioned my HDD to have a D: drive for files I'm working on and an E: drive for data (files that are not being changed much like photos or documentation)
I don't write anything into C:\Users\Norm.  The C: drive is for MS and other installed programs.

Why does nextChar method called in  readChoice throw the exception?  

Can you post the code for the readChoice method?

It is time to play computer and step through what the code will do.
What happens when the exploreCatalogue() method returns?  The break statement causes execution to exit the switch statement.
Then it goes the end of the while loop which will call readChoice() method for a char.  
The code for readChoice is not shown so we can't see what it does.   From the exception it looks like it calls the nextLine method without there being any input to read.
What should readChoice do it there isn't any input to read?  The Scanner class has a method for testing if there is a next line.

don't know why you would put the mkdir command method in a println statement

To see the results.  I would add some text to the println to make it more readable:     System.out.println("mkdir results:" + folder.mkdir()); // try to make a dir and show results

Also all switch statements should have a default: case to catch and handle invalid input values.

Can you copy the program's output that shows what you are asking about and paste it here with some comments describing what you want to be different?

Did you print the value returned by System.getProperty("user.dir")?  Are you confusing that property with user.home?

The declaration of the variable: secretKeySpe should be left where it is on line 5.  The assignment statement that gives it a value needs to be moved into the constructor so it can use the value of  pinToMd5 that was passed to the constructor.
When line 5(is that 17 in your code) is executed, pinToMd5 will have a null value: NPE

Why is a reference to MainActivity passed to the constructor on line 49?  I suggested that the value of decrypted1 be passed to the constructor.

I removed line 8,

No, line 8 was required to declare decrypt1 at the class level.  What needed to be changed was line 41 so it was only an assignment statement that assigned a value to the variable declared on line 8.

The purpose of the constructor I described was to accept the value of decrypt1 and save it so that it could be used to compute the value of secretKeySpe.
The statement that computes secretKeySpe needs to be inside of the constructor so that it can use the passed value of decrypt1.  The declaration of secretKeySpe needs to  be at the class level the same as with decrypt1 in the MainActivity class.

Several problems I see:
decrypted1 is declared in two places: line 8 and line 41.  The local declaration on line 41 masks the declaration on line 8.  Remove the declaration on line 41 and make it an assignment statement.  See post  Yesterday 4:10 PM

The value of decrypt1 should be passed in the constructor to the Decrypt2 class.  Once the constructor gets that value it can be used to compute the value of  secretKeySpe.  The existing code  uses a new instance of MainActivity(not the one with the desired value) to access the value of  decrypted1 which will not have a value in the new instance.

Passing a value to a constructor is very basic java.  How did you get to this point in your programming without learning how to use a class constructor?
Here is a link to the tutorial re constructors:   https://docs.oracle.com/javase/tutorial/java/javaOO/constructors.html

I've been trying to create a constructor,

If you are having problems with the code, you need to post the code and the error messages or a description of the problem.