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Rekenmachine

Auteur: Geen idee - 05 februari 2005 - 11:36 - Gekeurd door: Joel - Hits: 5389 - Aantal punten: 3.00 (1 stem)





Een rekenmachine.

Code:
php code - Bekijk de code zonder highlighting - Klap code in 
  1. import java.applet.Applet;
  2. import java.awt.*;
  3. import java.awt.event.ActionEvent;
  4. import java.awt.event.ActionListener;
  5.  
  6. public class AdderApplet extends Applet
  7.     implements ActionListener
  8. {
  9.  
  10.     public void init()
  11.     {
  12.         setLayout(new BorderLayout());
  13.         Panel textPanel = new Panel();
  14.         textPanel.setBackground(Color.gray);
  15.         textPanel.setLayout(new FlowLayout());
  16.         inputOutputField = new TextField("0", 20);
  17.         inputOutputField.setBackground(Color.purple);
  18.         textPanel.add(inputOutputField);
  19.         add(textPanel, "North");
  20.         Panel platformPanel = new Panel();
  21.         platformPanel.setLayout(new GridLayout(4, 5));
  22.         Panel button1Panel = new Panel();
  23.         button1Panel.setBackground(Color.black);
  24.         Button sevenButton = new Button(" 7 ");
  25.         sevenButton.addActionListener(this);
  26.         button1Panel.add(sevenButton);
  27.         Button eightButton = new Button(" 8 ");
  28.         eightButton.addActionListener(this);
  29.         button1Panel.add(eightButton);
  30.         Button nineButton = new Button(" 9 ");
  31.         nineButton.addActionListener(this);
  32.         button1Panel.add(nineButton);
  33.         Button divideButton = new Button(" / ");
  34.         divideButton.addActionListener(this);
  35.         button1Panel.add(divideButton);
  36.         platformPanel.add(button1Panel);
  37.         Panel button2Panel = new Panel();
  38.         button2Panel.setBackground(Color.black);
  39.         Button fourButton = new Button(" 4 ");
  40.         fourButton.addActionListener(this);
  41.         button2Panel.add(fourButton);
  42.         Button fiveButton = new Button(" 5 ");
  43.         fiveButton.addActionListener(this);
  44.         button2Panel.add(fiveButton);
  45.         Button sixButton = new Button(" 6 ");
  46.         sixButton.addActionListener(this);
  47.         button2Panel.add(sixButton);
  48.         Button multiplyButton = new Button(" * ");
  49.         multiplyButton.addActionListener(this);
  50.         button2Panel.add(multiplyButton);
  51.         platformPanel.add(button2Panel);
  52.         Panel button3Panel = new Panel();
  53.         button3Panel.setBackground(Color.black);
  54.         Button oneButton = new Button(" 1 ");
  55.         oneButton.addActionListener(this);
  56.         button3Panel.add(oneButton);
  57.         Button twoButton = new Button(" 2 ");
  58.         twoButton.addActionListener(this);
  59.         button3Panel.add(twoButton);
  60.         Button threeButton = new Button(" 3 ");
  61.         threeButton.addActionListener(this);
  62.         button3Panel.add(threeButton);
  63.         Button minusButton = new Button(" - ");
  64.         minusButton.addActionListener(this);
  65.         button3Panel.add(minusButton);
  66.         platformPanel.add(button3Panel);
  67.         Panel button4Panel = new Panel();
  68.         button4Panel.setBackground(Color.black);
  69.         Button zeroButton = new Button(" 0 ");
  70.         zeroButton.addActionListener(this);
  71.         button4Panel.add(zeroButton);
  72.         Button dotButton = new Button(" . ");
  73.         dotButton.addActionListener(this);
  74.         button4Panel.add(dotButton);
  75.         Button addButton = new Button(" + ");
  76.         addButton.addActionListener(this);
  77.         button4Panel.add(addButton);
  78.         Button equalsButton = new Button(" = ");
  79.         equalsButton.addActionListener(this);
  80.         button4Panel.add(equalsButton);
  81.         platformPanel.add(button4Panel);
  82.         add(platformPanel, "Center");
  83.         Panel clearPanel = new Panel();
  84.         clearPanel.setBackground(Color.blue);
  85.         Button clearButton = new Button(" CLEAR ");
  86.         clearButton.addActionListener(this);
  87.         clearPanel.add(clearButton);
  88.         add(clearPanel, "South");
  89.     }
  90.  
  91.     public void actionPerformed(ActionEvent e)
  92.     {
  93.         if(e.getActionCommand().equals(" 7 "))
  94.         {
  95.             numString = numString + "7";
  96.             inputOutputField.setText(numString);
  97.             flag = "y";
  98.         } else
  99.         if(e.getActionCommand().equals(" 8 "))
  100.         {
  101.             numString = numString + "8";
  102.             inputOutputField.setText(numString);
  103.             flag = "y";
  104.         } else
  105.         if(e.getActionCommand().equals(" 9 "))
  106.         {
  107.             numString = numString + "9";
  108.             inputOutputField.setText(numString);
  109.             flag = "y";
  110.         } else
  111.         if(e.getActionCommand().equals(" 4 "))
  112.         {
  113.             numString = numString + "4";
  114.             inputOutputField.setText(numString);
  115.             flag = "y";
  116.         } else
  117.         if(e.getActionCommand().equals(" 5 "))
  118.         {
  119.             numString = numString + "5";
  120.             inputOutputField.setText(numString);
  121.             flag = "y";
  122.         } else
  123.         if(e.getActionCommand().equals(" 6 "))
  124.         {
  125.             numString = numString + "6";
  126.             inputOutputField.setText(numString);
  127.             flag = "y";
  128.         } else
  129.         if(e.getActionCommand().equals(" 1 "))
  130.         {
  131.             numString = numString + "1";
  132.             inputOutputField.setText(numString);
  133.             flag = "y";
  134.         } else
  135.         if(e.getActionCommand().equals(" 2 "))
  136.         {
  137.             numString = numString + "2";
  138.             inputOutputField.setText(numString);
  139.             flag = "y";
  140.         } else
  141.         if(e.getActionCommand().equals(" 3 "))
  142.         {
  143.             numString = numString + "3";
  144.             inputOutputField.setText(numString);
  145.             flag = "y";
  146.         } else
  147.         if(e.getActionCommand().equals(" - "))
  148.         {
  149.             equalBuffer = "";
  150.             calcIt();
  151.             buttonBuffer = "-";
  152.         } else
  153.         if(e.getActionCommand().equals(" / "))
  154.         {
  155.             equalBuffer = "";
  156.             calcIt();
  157.             buttonBuffer = "/";
  158.         } else
  159.         if(e.getActionCommand().equals(" * "))
  160.         {
  161.             equalBuffer = "";
  162.             calcIt();
  163.             buttonBuffer = "*";
  164.         } else
  165.         if(e.getActionCommand().equals(" 0 "))
  166.         {
  167.             numString = numString + "0";
  168.             inputOutputField.setText(numString);
  169.         } else
  170.         if(e.getActionCommand().equals(" . "))
  171.         {
  172.             numString = numString + ".";
  173.             inputOutputField.setText(numString);
  174.         } else
  175.         if(e.getActionCommand().equals(" + "))
  176.         {
  177.             equalBuffer = "";
  178.             calcIt();
  179.             buttonBuffer = "+";
  180.         } else
  181.         if(e.getActionCommand().equals(" = "))
  182.         {
  183.             calcIt();
  184.             buttonBuffer = buttonBuffer;
  185.             equalBuffer = "=";
  186.         } else
  187.         if(e.getActionCommand().equals(" CLEAR "))
  188.         {
  189.             numString = "";
  190.             inputOutputField.setText("0");
  191.             buttonBuffer = "";
  192.             numBuffer = 0.0D;
  193.             equalBuffer = "";
  194.             equalString = "";
  195.         } else
  196.         {
  197.             inputOutputField.setText("Error in adder code.");
  198.         }
  199.         repaint();
  200.     }
  201.  
  202.     private void doTheMath()
  203.     {
  204.         if(buttonBuffer == "+")
  205.         {
  206.             if(numString == "")
  207.                 numString = "0";
  208.             numBuffer = numBuffer + stringToDouble(numString);
  209.             inputOutputField.setText(Double.toString(numBuffer));
  210.         } else
  211.         if(buttonBuffer == "-")
  212.         {
  213.             if(numString == "")
  214.                 numString = "0";
  215.             numBuffer = numBuffer - stringToDouble(numString);
  216.             inputOutputField.setText(Double.toString(numBuffer));
  217.         } else
  218.         if(buttonBuffer == "*")
  219.         {
  220.             if(numString == "")
  221.                 numString = "1";
  222.             numBuffer = numBuffer * stringToDouble(numString);
  223.             inputOutputField.setText(Double.toString(numBuffer));
  224.         } else
  225.         if(buttonBuffer == "/")
  226.         {
  227.             if(numString == "")
  228.                 numString = "1";
  229.             numBuffer = numBuffer / stringToDouble(numString);
  230.             inputOutputField.setText(Double.toString(numBuffer));
  231.         }
  232.     }
  233.  
  234.     private void doEqualMath()
  235.     {
  236.         if(buttonBuffer == "+")
  237.         {
  238.             numBuffer = numBuffer + stringToDouble(equalString);
  239.             inputOutputField.setText(Double.toString(numBuffer));
  240.         } else
  241.         if(buttonBuffer == "-")
  242.         {
  243.             numBuffer = numBuffer - stringToDouble(equalString);
  244.             inputOutputField.setText(Double.toString(numBuffer));
  245.         } else
  246.         if(buttonBuffer == "*")
  247.         {
  248.             numBuffer = numBuffer * stringToDouble(equalString);
  249.             inputOutputField.setText(Double.toString(numBuffer));
  250.         } else
  251.         if(buttonBuffer == "/")
  252.         {
  253.             numBuffer = numBuffer / stringToDouble(equalString);
  254.             inputOutputField.setText(Double.toString(numBuffer));
  255.         }
  256.     }
  257.  
  258.     private void calcIt()
  259.     {
  260.         numString = inputOutputField.getText();
  261.         if(flag == "y")
  262.         {
  263.             equalString = inputOutputField.getText();
  264.             doTheMath();
  265.             numBuffer = stringToDouble(inputOutputField.getText());
  266.             numString = "";
  267.         }
  268.         if(flag == "n")
  269.         {
  270.             if(equalBuffer == "=")
  271.                 doEqualMath();
  272.             numBuffer = stringToDouble(inputOutputField.getText());
  273.             if(equalBuffer != "=")
  274.                 buttonBuffer = "";
  275.             numString = "";
  276.         }
  277.         flag = "n";
  278.     }
  279.  
  280.     private static double stringToDouble(String stringObject)
  281.     {
  282.         return Double.valueOf(stringObject.trim()).doubleValue();
  283.     }
  284.  
  285.     public AdderApplet()
  286.     {
  287.         buttonBuffer = "";
  288.         equalBuffer = "";
  289.         numBuffer = 0.0D;
  290.         numString = "";
  291.         equalString = "";
  292.         flag = "n";
  293.     }
  294.  
  295.     private TextField inputOutputField;
  296.     private String buttonBuffer;
  297.     private String equalBuffer;
  298.     private double numBuffer;
  299.     private String numString;
  300.     private String equalString;
  301.     private String flag;
  302. }


php code - Bekijk de code zonder highlighting - Klap code in 
  1. <APPLET CODE="AdderApplet.class" WIDTH="175" HEIGHT="175">
  2. </APPLET>
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