First Java Applet, the first java Applet

First Java Applet, the first java Applet

I want to learn about android development. I recently started to learn the java language. The programming languages I have used before are limited to the most basic C language, and the learning of C ++ is limited to syntax, class and other concepts have not been touched yet. in order to learn Java, I initially bought the famous Thinking in Java, but after several pages, I found that it is not suitable for beginners to learn, I switched to the Java video of Miss Bi Xiangdong. I spent two days to read and encapsulate this part of content. During this period, I did not write code with the teacher, I feel like I will soon forget it, so I stopped and wanted to write some code to my own trainer. So I wrote a simple user name and password verification applet.

 

This is the first code except helloworld. It is still vague about when to use classes, methods, private, and static.

I hope that some of my friends and friends will give me some suggestions to facilitate future progress. Thank you ~~~

1/** 2 requirement analysis: 3 simple verification logon System 4 */

 

1/** 2 requirement analysis: 3 simple verification logon System 4 */5 import java. util. *; 6 import java. io. *; 7. // The display interface at the beginning of the program, including the software author, introduction, and other functions. 9 class StartScene 10 {11 public static void PrintStartScene () 12 {13 System. out. println ("\ n \ t welcome to use the Student Status Management System (simple edition)"); 14 System. out. println ("\ t Author: YangSH1996"); 15 System. out. println ("\ t time: 2015/12/1"); 16 System. out. println (""); 17 // create a new Login object 18 Login lg = new Login (); 19} 20 21} 22 23 // used for Login, go to System 24 class Login 25 {26 // set the correct username and password 27 private String correctName =" Dministrator "; 28 private String correctPassword =" admin123 "; 29 30 // constructor 31 Login () 32 {33 getNameAndPassword (); 34} 35 36 // enter 37 void getNameAndPassword () 38 {39 login SC = new Login (System. in); 40 System. out. print ("\ t enter your Username:"); 41 String getName = SC. nextLine (); 42 System. out. print ("\ t enter your password:"); 43 String getPassword = SC. nextLine (); 44 judgeNameAndPassword (getName, getPass Word); 45} 46 47 // determine the correctness of the user name and password 48 void judgeNameAndPassword (String getName, String getPassword) 49 {50 if (! GetName. equals (correctName) 51 {52 System. out. println ("\ t username does not exist! "); 53 login sc1 = new Login (System. in); 54 System. out. print (" \ t do you want to exit? Y/N \ t "); 55 String choice = sc1.nextLine (); 56 if (choice. charAt (0) = 'y' | choice. charAt (0) = 'y') 57 {58 System. out. println ("\ n \ t thank you for your use. \ N "); 59 System. exit (0); 60} 61 62 getNameAndPassword (); 63} 64 else 65 {66 if (! GetPassword. equals (correctPassword) 67 {68 System. out. println ("\ t Password error! "); 69 getNameAndPassword (); 70} 71 else 72 {73 System. out. print (" \ t correct! Welcome to log on. The Menu \ n "will be displayed soon. 74 menu Menu = new Menu (); // execution Menu 75} 76} 77} 78 79 80} 81 82 // Menu 83 class Menu 84 {85 Menu () 86 {87 88 try {89 System. out. println ("\ t3 seconds later program exited"); 90 Thread. sleep (1000); 91 System. out. println ("\ 2 seconds later the program exits"); 92 Thread. sleep (1000); 93 System. out. println ("\ t1 seconds later program exited"); 94 Thread. sleep (1000); 95} catch (InterruptedException e) {96 e. printStackTrace (); 97} 98 99} 100 101 102 103 // class where the main function is located 104 public class Practice20151218106 {105 // entry for jvm recognition main function 107 public static void main (String [] args) 109 {110 StartScene ss = new StartScene (); 111 StartScene. printStartScene (); 112 113} 114}

 

 

I hope that the vast majority of friends and friends can give me some suggestions, any little bit, to facilitate my future progress. Thank you ~~~