java实验报告——简单计算器的编写.doc

JAVA实验报告简单计算器的编写 班级： 学号： 姓名： 一、实验目的1.掌握java图形用户界面（GUI)的设计原理和程序结构2.能设计复核问题要求的图形用户界面程序3.掌握常用组件的事件接口4.应用awt和swing组件进行应用程序设计二、实验条件1.计算机一台2.java软件开发环境三、实验步骤1、编写代码：mport java.awt.*;import java.awt.event.*;import javax.swing.*;public class JCalculator extends JFrame implements ActionListener private static final long serialVersionUID = -169068472193786457L private class WindowCloser extends WindowAdapter public void windowClosing(WindowEvent we) System.exit(0); int i; private final String str = 7, 8, 9, /, 4, 5, 6, *, 1, 2, 3, -, ., 0, =, + ; JButton buttons = new JButtonstr.length; JButton reset = new JButton(CE); JTextField display = new JTextField(0); public JCalculator() super(Calculator); JPanel panel1 = new JPanel(new GridLayout(4, 4); for (i = 0; i str.length; i+) buttonsi = new JButton(stri); panel1.add(buttonsi); 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 0) handleNumber(label); else handleOperator(label); boolean isFirstDigit = true; public void handleNumber(String key) if (isFirstDigit) display.setText(key); else if (key.equals(.) & (display.getText().indexOf(.) 0) display.setText(display.getText() + .); else if (!key.equals(.) display.setText(display.getText() + key); isFirstDigit = false; public void handleReset() display.setText(0); isFirstDigit = true; operator = =; double number = 0.0; String operator = =; 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 (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、运行结果，见截图计算测试：123+456=579结果正确，程序无误。计算测试：10X10X10=1000，结果正确，程序无误。四、实验总结 通过对计算器窗体的编写我熟悉java图形用户界面的设计原理和程序结构熟悉javaawt和swing的组合。学会将书本上的知识运用在实际中，提升 了编程能力。尤其在JavaApplet图形