import java.awt.*; import java.awt.event.*; import java.applet.*; import javax.swing.*; import javax.swing.border.*; /** * Title: * Description: * Copyright: Copyright (c) 2001 * Company: * @author * @version 1.0 */ public class pcApp extends JApplet implements ActionListener { double n, r; public void actionPerformed(ActionEvent e) { if(e.getSource()==btnCalculate) { double n = Double.parseDouble(jTextField1.getText()); double r = Double.parseDouble(jTextField2.getText()); jLabelNW.setText((int)permRep(n,r)+""); jLabelNE.setText((int)permNoRep(n,r)+""); jLabelSW.setText((int)combRep(n,r)+""); jLabelSE.setText((int)combNoRep(n,r)+""); } } boolean isStandalone = false; GridLayout gridLayout1 = new GridLayout(); JLabel jLabel2 = new JLabel(); JLabel jLabelNE = new JLabel(); JLabel lblRCombs = new JLabel(); JLabel lblNval = new JLabel(); JLabel lblFiller = new JLabel(); JLabel lblRepAllowed = new JLabel(); JLabel lblRPerm = new JLabel(); JLabel lblRepNotAllow = new JLabel(); JButton btnCalculate = new JButton(); TitledBorder titledBorder1; TitledBorder titledBorder2; TitledBorder titledBorder3; Border border1; Border border2; JLabel jLabelSW = new JLabel(); JLabel jLabelNW = new JLabel(); JLabel lblHold4 = new JLabel(); JTextField jTextField1 = new JTextField(); TitledBorder titledBorder4; Border border3; JTextField jTextField2 = new JTextField(); JLabel jLabel4 = new JLabel(); JLabel jLabelSE = new JLabel(); /**Get a parameter value*/ public String getParameter(String key, String def) { return isStandalone ? System.getProperty(key, def) : (getParameter(key) != null ? getParameter(key) : def); } /**Construct the applet*/ public pcApp() { } /**Initialize the applet*/ public void init() { try { jbInit(); } catch(Exception e) { e.printStackTrace(); } } /**Component initialization*/ private void jbInit() throws Exception { titledBorder1 = new TitledBorder(""); titledBorder2 = new TitledBorder(""); titledBorder3 = new TitledBorder(""); border1 = BorderFactory.createMatteBorder(1,1,1,1,SystemColor.control); border2 = BorderFactory.createMatteBorder(1,1,1,1,Color.lightGray); titledBorder4 = new TitledBorder(""); border3 = BorderFactory.createCompoundBorder(BorderFactory.createBevelBorder(BevelBorder.LOWERED,Color.white,Color.white,new Color(178, 178, 178),new Color(124, 124, 124)),BorderFactory.createEmptyBorder(1,1,1,1)); lblRepNotAllow.setBackground(new Color(156, 207, 255)); lblRepNotAllow.setFont(new java.awt.Font("SansSerif", 1, 12)); lblRepNotAllow.setForeground(Color.black); lblRepNotAllow.setBorder(BorderFactory.createLineBorder(Color.black)); lblRepNotAllow.setOpaque(true); lblRepNotAllow.setHorizontalAlignment(SwingConstants.CENTER); lblRepNotAllow.setText("Repetition Not Allowed"); lblRPerm.setBackground(new Color(156, 207, 255)); lblRPerm.setFont(new java.awt.Font("SansSerif", 1, 12)); lblRPerm.setForeground(Color.black); lblRPerm.setBorder(BorderFactory.createLineBorder(Color.black)); lblRPerm.setOpaque(true); lblRPerm.setHorizontalAlignment(SwingConstants.CENTER); lblRPerm.setText("r-permutations"); lblRepAllowed.setBackground(new Color(156, 207, 255)); lblRepAllowed.setFont(new java.awt.Font("SansSerif", 1, 12)); lblRepAllowed.setForeground(Color.black); lblRepAllowed.setBorder(BorderFactory.createLineBorder(Color.black)); lblRepAllowed.setOpaque(true); lblRepAllowed.setHorizontalAlignment(SwingConstants.CENTER); lblRepAllowed.setText("Repetition Allowed"); lblFiller.setBackground(SystemColor.control); lblFiller.setFont(new java.awt.Font("SansSerif", 1, 12)); lblFiller.setBorder(BorderFactory.createLineBorder(Color.black)); lblFiller.setOpaque(true); lblFiller.setHorizontalAlignment(SwingConstants.CENTER); lblFiller.setText("n = " + (int)n + ", r = " + (int)r); lblNval.setFont(new java.awt.Font("Dialog", 1, 11)); lblNval.setForeground(Color.gray); lblNval.setHorizontalAlignment(SwingConstants.RIGHT); lblNval.setText("Enter a value for n:"); lblRCombs.setBackground(new Color(156, 207, 255)); lblRCombs.setFont(new java.awt.Font("SansSerif", 1, 12)); lblRCombs.setForeground(Color.black); lblRCombs.setBorder(BorderFactory.createLineBorder(Color.black)); lblRCombs.setOpaque(true); lblRCombs.setHorizontalAlignment(SwingConstants.CENTER); lblRCombs.setText("r-combinations"); jLabelNE.setBackground(new Color(204, 204, 204)); jLabelNE.setBorder(border1); jLabelNE.setHorizontalAlignment(SwingConstants.CENTER); jLabelNE.setText(""); gridLayout1.setRows(5); gridLayout1.setColumns(3); gridLayout1.setHgap(3); gridLayout1.setVgap(3); this.getContentPane().setBackground(Color.white); this.setSize(new Dimension(455, 165)); this.getContentPane().setLayout(gridLayout1); btnCalculate.setBorder(BorderFactory.createEtchedBorder()); btnCalculate.setText("Calculate!"); btnCalculate.addActionListener(this); jLabelSW.setBorder(border1); jLabelSW.setHorizontalAlignment(SwingConstants.CENTER); jLabelSW.setText(""); jLabelNW.setBorder(border1); jLabelNW.setHorizontalAlignment(SwingConstants.CENTER); jLabelNW.setText(""); jTextField1.setFont(new java.awt.Font("DialogInput", 1, 12)); jTextField1.setBorder(border3); jTextField1.setText(""); jTextField2.setFont(new java.awt.Font("DialogInput", 1, 12)); jTextField2.setBorder(border3); jTextField2.setText(""); jLabel4.setFont(new java.awt.Font("SansSerif", 1, 11)); jLabel4.setForeground(Color.gray); jLabel4.setHorizontalAlignment(SwingConstants.RIGHT); jLabel4.setText("Enter a value for r:"); jLabelSE.setBorder(border1); jLabelSE.setHorizontalAlignment(SwingConstants.CENTER); jLabelSE.setText(""); this.getContentPane().add(lblFiller, null); this.getContentPane().add(lblRepAllowed, null); this.getContentPane().add(lblRepNotAllow, null); this.getContentPane().add(lblRCombs, null); this.getContentPane().add(jLabelNW, null); this.getContentPane().add(jLabelNE, null); this.getContentPane().add(lblRPerm, null); this.getContentPane().add(jLabelSW, null); this.getContentPane().add(jLabelSE, null); this.getContentPane().add(btnCalculate, null); this.getContentPane().add(lblNval, null); this.getContentPane().add(jTextField1, null); this.getContentPane().add(lblHold4, null); this.getContentPane().add(jLabel4, null); this.getContentPane().add(jTextField2, null); } /**Get Applet information*/ public String getAppletInfo() { return "Applet Information"; } /**Get parameter info*/ public String[][] getParameterInfo() { return null; } //static initializer for setting look & feel static { try { //UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); //UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName()); } catch(Exception e) { } } public double fac( double x ) { if( x == 1) return x; else { return x*fac(x-1); } } public double permRep( double n, double r ) { return Math.pow(n, r); } public double permNoRep( double n, double r ) { return (fac(n)/fac(n-r)); } public double combRep( double n, double r ) { return (fac(n+r-1)/(fac(r)*fac(n-1))); } public double combNoRep( double n, double r ) { return (fac(n)/(fac(r)*fac(n-r))); } }