java實驗報告簡單計算器的編寫

1、JAVA實驗報告簡單計算器的編寫班級：學號：一、實驗?zāi)康?. 掌握java圖形用戶界面GUI)的設(shè)計原理和程序構(gòu)造2能設(shè)計復核問題要求的圖形用戶界面程序3. 掌握常用組件的事件接口4. 應(yīng)用awt和swing組件進展應(yīng)用程序設(shè)計二、實驗條件1計算機一臺2. java軟件開發(fā)環(huán)境三、實驗步驟1、編寫代碼：public class JCalculator extends JFrame implements ActionListener private class WindowCloser extends WindowAdapter public void windowClosing(WindowE

2、vent we) System.exit(O);int i;private final String str = "7", "8", "9", "/", "4", "5", "6", "*", "18 / 8"2","3","-", ".", "0", "=", "+" ;utton bu

3、ttons = new uttonstr.length;utton reset = new utton("CE");JTextField display = new JTextField("O");public JCalculator() super("Calculator");JPanel panel1 = new JPanel(new GridLayout(4, 4);for (i = 0; i < str.length; i+) buttonsi = new utton(stri);panel1.add(buttonsi)

4、;JPanel panel2 = new JPanel(new BorderLayout();panel2.add("Center", display);panel2.add("East", reset);getContentPane().setLayout(new BorderLayout();getContentPane().add("North", panel2);getContentPane().add("Center", panel1);for (i = 0; i < str.length; i+)

5、buttonsi.addActionListener(this);reset.addActionListener(this);display.addActionListener(this);addWindowListener(new WindowCloser();setSize(800, 800);setVisible(true);pack(); public void actionPerformed(ActionEvent e) Object target = e.getSource();String label = e.getActionmand();if (target = reset)

6、handleReset();else if ("0123456789.".indexOf(label) > 0)handleNumber(label);elsehandleOperator(label); boolean isFirstDigit = true;public void handleNumber(String key) if (isFirstDigit)display.setText(key);else if (key.equals(".") && (display.getText().indexOf(".&

7、quot;) < 0)display.setText(display.getText() + ".");else if (!key.equals(".")display.setText(display.getText() + key);isFirstDigit = false;public void handleReset() display.setText("O");isFirstDigit = true;operator ="=" double number = 0.0;String operator =

8、"="public void handleOperator(String key) if (operator.equals("+")number += Double.valueOf(display.getText();else if (operator.equals("-")number -= Double.valueOf(display.getText();else if (operator.equals("*")number *= Double.valueOf(display.getText();else if

9、 (operator.equals("/")number /= Double.valueOf(display.getText();else if (operator.equals("=")number = Double.valueOf(display.getText();display.setText(String.valueOf(number);operator = key;isFirstDigit = true;public static void main(String args) new JCalculator();2、運行結(jié)果，見截圖GE7et561270=4-計算測試：123+456=579 結(jié)果正確，程序無誤XId C 計算測試：10X10X10=1000 ，結(jié)果正確，程序無誤。四、實驗總結(jié)通過對計算器窗體的編寫我熟悉java圖形用戶界面的設(shè)計原理和程序構(gòu)造熟 悉java awt和swing的組合。學會將書本上的知識