visual basic barcode program A Statistics Application in Java

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A Statistics Application
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With the Stats and Graphs classes, it is possible to build a simple, yet effective graphics application. The main window of the application is created by the StatsWin class, shown here:
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import java.awt.*; import java.awt.event.*; import java.util.*;
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import java.text.*; // Process and display statistical data. public class StatsWin extends Frame implements ItemListener, ActionListener
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NumberFormat nf = NumberFormat.getInstance(); TextArea Checkbox Checkbox Checkbox Checkbox statsTA; bar = new scatter = regplot = datawin =
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Checkbox("Bar Graph"); new Checkbox("Scatter Graph"); new Checkbox("Regression Line Plot"); new Checkbox("Show Data");
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double[] data; Graphs bg; Graphs sg; Graphs rp; DataWin da; RegData rd; public StatsWin(double vals[]) { data = vals; // save reference to data addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent we) { shutdown(); } }); // Create the File menu. createMenu(); // Change to flow layout, centering components. setLayout(new FlowLayout(FlowLayout.CENTER)); setSize(new Dimension(300, 240)); setTitle("Statistical Data"); rd = Stats.regress(data); // Set the number format to 2 decimal digits.
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8: Statistics, Graphing, and Java
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nf.setMaximumFractionDigits(2);
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// Construct output. String mstr; try { // Obtain mode, if there is one. mstr = nf.format(Stats.mode(data)); } catch(NoModeException exc) { mstr = exc.toString(); } String str = "Mean: " + nf.format(Stats.mean(data)) + "\n" + "Median: " + nf.format(Stats.median(data)) + "\n" + "Mode: " + mstr + "\n" + "Standard Deviation: " + nf.format(Stats.stdDev(data)) + "\n\n" + "Regression equation: " + rd.equation + "\nCorrelation coefficient: " + nf.format(rd.cor); // Put output in text area. statsTA = new TextArea(str, 6, 38, TextArea.SCROLLBARS_NONE); statsTA.setEditable(false); // Add components to window. add(statsTA); add(bar); add(scatter); add(regplot); add(datawin); // Add component listeners. bar.addItemListener(this); scatter.addItemListener(this); regplot.addItemListener(this); datawin.addItemListener(this); setVisible(true); } // Handle the Close menu option. public void actionPerformed(ActionEvent ae) {
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String arg = (String)ae.getActionCommand(); if(arg == "Close") { shutdown(); } } // User changed a check box. public void itemStateChanged(ItemEvent ie) { if(bar.getState()) { if(bg == null) { bg = new Graphs(data, Graphs.BAR); bg.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent we) { bar.setState(false); bg = null; } }); } } else { if(bg != null) { bg.dispose(); bg = null; } } if(scatter.getState()) { if(sg == null) { sg = new Graphs(data, Graphs.SCATTER); sg.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent we) { scatter.setState(false); sg = null; } }); } } else { if(sg != null) { sg.dispose(); sg = null; } }
8: Statistics, Graphing, and Java
if(regplot.getState()) { if(rp == null) { rp = new Graphs(data, Graphs.REGPLOT); rp.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent we) { regplot.setState(false); rp = null; } }); } } else { if(rp != null) { rp.dispose(); rp = null; } } if(datawin.getState()) { if(da == null) { da = new DataWin(data); da.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent we) { datawin.setState(false); da = null; } }); } } else { if(da != null) { da.dispose(); da = null; } } } // Create the File menu. private void createMenu() { MenuBar mbar = new MenuBar(); setMenuBar(mbar); Menu file = new Menu("File"); MenuItem close = new MenuItem("Close");
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file.add(close); mbar.add(file); close.addActionListener(this); } // Shut down the windows. private void shutdown() { if(bg != null) bg.dispose(); if(sg != null) sg.dispose(); if(rp != null) rp.dispose(); if(da != null) da.dispose(); setVisible(false); dispose(); } }
The StatsWin class extends Frame to create a top-level window in which statistical information is displayed. It also includes check boxes that allow the user to display the data in the various graphic formats and to display a window that shows the data. StatsWin implements the ItemListener and ActionListener interfaces. StatsWin begins by obtaining a NumberFormat object. NumberFormat is a class that helps format numeric data. StatsWin uses it to specify the number of decimal digits that will be displayed for the various statistics. StatsWin continues by declaring several instance variables that hold references to the various GUI objects used by the class. This includes a text area, four check boxes, and three Graphs objects. A reference to a DataWin object is stored in da. DataWin is a window class that displays the data as numerical values and is described later. A reference to the data being analyzed is stored in data, and a reference to the regression data is stored in rd. The methods in StatsWin are described in turn.
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