2022年用java编写一个简易的计算器代码.pdf

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1、import 使用 java 语言开发一个简易计算器* * */public class TestJsq extends JFrame implements ActionListener, KeyListener private JTextField jtf;private JButton jb_bk, jb_ce, jb_c;private String xs = ;private double sum = 0;private int fh;public static void main(String args) new TestJsq().creatCUI();public void cr

2、eatCUI() JFrame jf = new JFrame();(计算器 );jtf = new JTextField(0.);(jtf, ;JPanel jp_main = new JPanel(new BorderLayout();(jp_main);JPanel jp1 = new JPanel(new GridLayout(1, 3, 1, 1);jb_bk = new JButton(Backspace);(this);jb_ce = new JButton(CE);(this);jb_c = new JButton(C);(this);(jb_bk);(jb_ce);(jb_c

3、);(jp1, ;JPanel jp2 = new JPanel(new GridLayout(4, 5, 1, 1);String str = 7, 8, 9, /, sqrt, 4, 5, 6, *, %,1, 2, 3, -, 1 /x, 0, +/-, ., +, = ;for (int i = 0; i 20; i+) JButton jb = new JButton(stri);精品资料 - - - 欢迎下载 - - - - - - - - - - - 欢迎下载 名师归纳 - - - - - - - - - -第 1 页，共 7 页 - - - - - - - - - - (thi

4、s);if (i = 3 | i = 8 | i = 13 | i = 18 | i = 19) ;(jb);(jp2, ;(false);(50, 50, 350, 350);(true);Overridepublic void actionPerformed(ActionEvent e) String s = ();if (CE) | (C) xs = ;(0.); else if (Backspace) String str = (0, () - 1);xs = str;(xs); else if (7) | (8) | (9)| (4) | (5) | (6)| (1) | (2) |

5、 (3)| (0) | (.) xs = xs + s;(xs); else if (+/-) double x = (xs);xs= + (-x);(xs); else if (/) fh = 4;int point = (.);if (point != -1) String strt = (0, point);精品资料 - - - 欢迎下载 - - - - - - - - - - - 欢迎下载 名师归纳 - - - - - - - - - -第 2 页，共 7 页 - - - - - - - - - - String z = (point + 1, ();int z_num = ();su

6、m = (strt) + (double) (z)/ (10 * z_num); else sum = (xs);xs = ;(null); else if (*) fh = 3;int point = (.);if (point != -1) String strt = (0, point);String z = (point + 1, ();int z_num = ();sum = (strt) + (double) (z)/ (10 * z_num); else sum = (xs);xs = ;(null); else if (-) fh = 2;int point = (.);if

7、(point != -1) String strt = (0, point);String z = (point + 1, ();int z_num = ();sum = (strt) + (double) (z)/ (10 * z_num); else sum = (xs);xs = ;(null); else if (+) 精品资料 - - - 欢迎下载 - - - - - - - - - - - 欢迎下载 名师归纳 - - - - - - - - - -第 3 页，共 7 页 - - - - - - - - - - fh = 1;int point = (.);if (point !=

8、-1) String strt = (0, point);String z = (point + 1, ();int z_num = ();sum = (strt) + (double) (z)/ (10 * z_num); else sum = (xs);xs = ;(null); else if (sqrt) double x = (xs);double x1 = (x);xs = x1 + ;(xs); else if (%) double x = (xs);x= * x*x;xs=x+;(xs); else if (1/x) if (xs = 0) (除数不能为0); else dou

9、ble x = (xs);double x1 = 1 / x;xs = x1 + ;(xs); else if (=) if (fh != 0) switch (fh) case 1:int point1 = (.);精品资料 - - - 欢迎下载 - - - - - - - - - - - 欢迎下载 名师归纳 - - - - - - - - - -第 4 页，共 7 页 - - - - - - - - - - if (point1 != -1) String s1 = (0, point1);String z1 = (point1 + 1, ();int z1_num = ();xs = ;

10、double ss1 = (s1)+ (double) (z1) / (10 * z1_num);sum = sum + ss1; else sum = sum + (xs);xs = ;fh = 0;break;case 2:int point2 = (.);if (point2 != -1) String s2 = (0, point2);String z2 = (point2 + 1, ();int z2_num = ();xs = ;double ss2 = (s2)+ (double) (z2) / (10 * z2_num);sum = sum - ss2; else sum =

11、sum - (xs);xs = ;fh = 0;break;case 3:int point3 = (.);if (point3 != -1) String s3 = (0, point3);String z3 = (point3 + 1, ();int z1_num = ();xs = ;double s4 = (s3)+ (double) (z3) / (10 * z1_num);sum = sum * s4; else sum = sum * (xs);xs = ;精品资料 - - - 欢迎下载 - - - - - - - - - - - 欢迎下载 名师归纳 - - - - - - -

12、- - -第 5 页，共 7 页 - - - - - - - - - - fh = 0;break;case 4:int point4 = (.);if (point4 != -1) String s4 = (0, point4);String z4 = (point4 + 1, ();int z4_num = ();xs = ;double s5 = (s4)+ (double) (z4) / (10 * z4_num);sum = sum / s5; else sum = sum / (xs);xs = ;fh = 0;break;default:break;xs = (sum);(xs)

13、;fh = 0; else (null);Overridepublic void keyPressed(KeyEvent e) / TODO Auto-generated method stubOverridepublic void keyReleased(KeyEvent e) / TODO Auto-generated method stub精品资料 - - - 欢迎下载 - - - - - - - - - - - 欢迎下载 名师归纳 - - - - - - - - - -第 6 页，共 7 页 - - - - - - - - - - Overridepublic void keyTyped(KeyEvent e) / TODO Auto-generated method stub精品资料 - - - 欢迎下载 - - - - - - - - - - - 欢迎下载 名师归纳 - - - - - - - - - -第 7 页，共 7 页 - - - - - - - - - -