Initial Upload

Author: itsjasonlee

Calculator.java

@@ -0,0 +1,175 @@
+/* Jason Lee
+Jsnlee At Ucdavis.edu
+*/
+
+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.*;
+r
+public class Calculator implements ActionListener
+{
+   static JButton[] digitButton = new JButton[10];
+   static JButton[] temp = new JButton[18];
+   static JButton addButton, subButton, multiplyButton, divideButton, equalButton, clearButton, clearEverything, negativeButton;
+   static JTextField textField;
+   static double operationOne, operationTwo, result;
+   static char operator;
+   static boolean newNumber;
+   static void addDigit(int i) {
+      if (newNumber) {
+         textField.setText(""+i);
+         newNumber = false;
+      }
+      else {
+         textField.setText(textField.getText() + i);
+      }
+   }
+
+   // To control actions
+   public void actionPerformed(ActionEvent e) {
+        for(int i = 0; i < 10; i++) {
+            if(event.getSource() == digitButton[i]) {
+            addDigit(i);
+            return;
+            }
+        }  
+
+        // To Add Button
+        if(event.getSource() == addButton) {
+        operationOne = Double.parseDouble(textField.getText());
+        newNumber = true;
+        operator = '+';
+        return;
+        }
+
+        // To Subtract Button
+        if(event.getSource() == subButton) {
+        operationOne = Double.parseDouble(textField.getText());
+        newNumber = true;
+        operator = '-';
+        return;
+        }
+        // To Multiply Button
+        if(event.getSource() == multiplyButton) {
+        operationOne = Double.parseDouble(textField.getText());
+        newNumber = true;
+        operator = '*';
+        return;
+        }
+
+        // To Divide Button
+        if(event.getSource() == divideButton) {
+        operationOne = Double.parseDouble(textField.getText());
+        newNumber = true;
+        operator = '/';
+        return;
+        }
+
+        // To Clear Button
+        if(event.getSource() == clearButton) {
+            operationOne = 0;
+            textField.setText(" "+result);
+            newNumber = true;
+            return;
+        }
+
+        // To Clear Everything
+        if(event.getSource() == clearEverything) {
+            operationTwo = 0;
+            operationOne = 0;
+            result = 0;
+            textField.setText(" "+result);
+            newNumber = true;
+            return;
+
+        }
+
+        // To Negative Button
+        if(event.getSource() ==  negativeButton) {
+            if(operationTwo != 0) {
+                operationTwo = operationTwo * -1;
+            }
+            if(operationOne != 0) {
+                operationOne = operationOne * -1;
+            }
+            if(result != 0) {
+                result = result * -1;
+            }
+            textField.setText(" "+ result);
+            newNumber = true;
+            return;
+        }
+
+        // To Equal Button
+        if (event.getSource() == equalButton) {
+        operationTwo = Double.parseDouble(textField.getText());
+        switch (operator) {
+            case '/': result = operationOne / operationTwo; break;
+            case '*': result = operationOne * operationTwo; break;
+            case '-': result = operationOne - operationTwo; break;
+            case '+': result = operationOne + operationTwo; break;
+        }
+        textField.setText(" "+result);
+        newNumber = true;
+        return;
+        }   
+      }
+
+      public static void main(String[] args) {
+          //initialize the calculator
+         JFrame frm = new JFrame(" Jason Lee ");
+         ActionListener AL = new Calculator();
+         Container contentPane = frm.getContentPane();
+         contentPane.setLayout(new FlowLayout());
+         frm.pack();
+         //set the sizing
+         frm.setSize(310,240);
+         contentPane.add(new JLabel("Calculator",JLabel.CENTER));
+         contentPane.add(textField = new JTextField("",25));
+         textField.setHorizontalAlignment(JTextField.RIGHT);
+         JPanel C = new JPanel(new GridLayout(4,4,2,2));
+         String digits[] = {"C", "CE", "   +/-   ", "/", "7", "8", "9", "*", "4", "5", "6", "-", "1", "2", "3", "+", ".", "    =    "}; 
+         //                  0    1        2         3    4    5    6    7    8    9    10  11    12   13   14   15   16       17           
+         for (int i=0; i<18; i++) {
+            C.add(temp[i] = new JButton(digits[i]));
+            temp[i].addActionListener(AL);
+         }
+         //create digit buttons
+         digitButton[1]= temp[12];  // 1
+         digitButton[2]= temp[13];  // 2
+         digitButton[3]= temp[14];  // 3
+         digitButton[4]= temp[8];   // 4
+         digitButton[5]= temp[9];   // 5
+         digitButton[6]= temp[10];  // 6
+         digitButton[7]= temp[4];   // 7
+         digitButton[8]= temp[5];   // 8
+         digitButton[9]= temp[6];   // 9
+
+         //create buttons
+         divideButton = temp[3];    // /
+         addButton = temp[15];      // +
+         subButton = temp[11];      // -
+         equalButton = temp[17];    // =
+         multiplyButton = temp[7];  // *
+         clearButton = temp[0];     // Clear
+         clearEverything = temp[1]; // Clear Everthing
+         negativeButton =  temp[2]; // +/-
+
+         //create layout using jpanel
+         JPanel D = new JPanel(new GridLayout(1,2,2,2));
+         D.add(digitButton[0] = new JButton("       0       "));
+         digitButton[0].addActionListener(AL);
+         JPanel E = new JPanel(new GridLayout(1,2,2,2));
+         E.add(temp[16]);
+         E.add(temp[17]);
+
+        //create layout using jpanel
+         contentPane.add(C);
+         contentPane.add(D);
+         D.add(E);
+
+         // closing the calcuatlor with the exit
+         frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+         frm.setVisible(true);
+      }
+}