Data structure (Java version) practice collection Simple Book Management system

A practical tutorial on data Structure (Java edition)

Read the first chapter of the collection combined with the code in the book slightly modified to do a little exercise:

Curriculum class:

Package Com.chujianyun.com;public class Table {private string Key;private string Rest;public table () {}public table ( String key, String rest) {super (); This.key = Key;this.rest = rest;} Public String GetKey () {return key;} public void Setkey (String key) {This.key = key;} Public String Getrest () {return rest;} public void Setrest (String rest) {this.rest = rest;} @Overridepublic boolean equals (Object obj) {return key.equals ((Table) obj). key);} @Overridepublic String toString () {return "Table [key=" + key + ", rest=" + rest + "]";}}

File Operation class:

Package Com.chujianyun.com;import Java.io.bufferedreader;import Java.io.bufferedwriter;import java.io.File;import Java.io.fileinputstream;import Java.io.filenotfoundexception;import Java.io.fileoutputstream;import Java.io.filereader;import Java.io.filewriter;import Java.io.ioexception;import Java.io.InputStreamReader;import Java.io.outputstreamwriter;import Java.util.hashset;import Java.util.linkedhashset;import Java.util.Scanner; Import Java.util.set;public class Fileoperator {private static String FilePath = "E:\\table.txt";p ublic static Set<tab  Le> readFile () {set<table> Set = new linkedhashset<table> ();  File File = new file (FilePath);  BufferedReader BF = null;     try {bf = new BufferedReader (new InputStreamReader (new FileInputStream (file), "GBK"));             String str,key,rest; Table tbl =null;while ((Str=bf.readline ())!=null) {key = Str.substring (0,4); rest = str.substring (5); tbl = new Table (Key, rest); Set.add (TBL);}} catch (FileNotFoundException e) {System. out.println ("No Files found!" ");//e.printstacktrace ();} catch (IOException e) {System.out.println ("Open or Access file exception" +e.getmessage ());//e.printstacktrace ();}    Finally{try {bf.close ();} catch (IOException e) {//TODO auto-generated catch Blocke.printstacktrace ();}} return set;} public static void WriteFile (Set<table> Set) {File File = new file (FilePath); BufferedWriter bw = null;//table TBL = null;try {bw = new BufferedWriter (new OutputStreamWriter (file) , "GBK")), for (Table tbl:set) {bw.write (Tbl.getkey () + "" +tbl.getrest () + "\ r \ n");} Bw.flush ();} catch (IOException e) {System.out.println ("Open or Access file exception" +e.getmessage ());} Finally{try {bw.close ();} catch (IOException e) {System.out.println ("Write buffer stream close exception" +e.getmessage ());}}} public static void Select () {System.out.println ("\ n-----------------------------------------"); SYSTEM.OUT.PRINTLN ("Input number for function selection:"); System.out.println ("1: Find a course according to the course number;"); System.out.println ("2: Delete Course according to course number:"); System.out.println ("3: Add a course record to the curriculum:"); System.out.println ("4: Show in CurriculumAll course records "); System.out.println ("5: Change course record in Curriculum"); System.out.println ("-1: Exit"); System.out.println ("-----------------------------------------"); System.out.print ("Feature Selection:");} Find public static Table findtable (String key,set<table> TBLs) {for (Table Tbl:tbls) {if (Tbl.getkey ()) based on key and Set. EQ  Uals (key)) {return tbl; }}return null;} public static void Findtableinput (Set<table> tbls,scanner in) {String input = ""; System.out.print ("Please enter the curriculum to find:"); input =in.next (); Table tbl = findtable (input, TBLs), if (tbl==null) {System.out.println ("No curriculum for the course number found");} Else{system.out.println ("The corresponding curriculum is:" +tbl);}} public static void Edittableinput (set<table> tbls,string input) {String key = input.substring (0,4); String rest = input.substring (5); for (Table Tbl:tbls) {if (Tbl.getkey (). Equals (key)) {tbl.setrest (rest); System.out.println ("Modify the course number to [" +key+ "] successfully! ");}}} public static void Edittableinput (Set<table> tbls,scanner in) {String input = "";        System.out.print ("Please enter the curriculum to be modified:");        Input=in.nextline ();Input=in.nextline (); Edittableinput (tbls,input);} public static void Deletetable (String key,set<table> tbls) {Table tblremove = findtable (key, TBLs); if (tblremove!= NULL) {tbls.remove (tblremove); WriteFile (TBLs); System.out.println ("Delete number: [" +key+ "] course success! ");} Else{system.out.println ("Not retrieved, course number: [" +key+ "] corresponding to the course, delete failed! ");} } public static void Deletetableinput (Set<table> tbls,scanner in) {String input = ""; System.out.print ("Please enter the curriculum to be deleted:"), input =in.next ();d eletetable (input, tbls);}         public static void AddTable (Set<table> tbls,scanner in) {String input= "";                  System.out.print ("Please enter the curriculum to be added:");         Input=in.nextline (); Input=in.nextline (); String key = Input.substring (0,4);  String rest = input.substring (5); Tbls.add (new Table (key,rest)); WriteFile (TBLs); System.out.print ("Add Curriculum:" +key+ "Success!) ");} public static void Printtables (Set<table> tbls) {for (Table tbl:tbls) {System.out.println (TBL);}}}

Test class:

Package Com.chujianyun.com;import Java.util.scanner;import Java.util.set;public class Setdemo {public static void main ( String[] args) {set<table> TBLs = Fileoperator.readfile ();/*for (Table tbl:tbls) {System.out.println (TBL);} */scanner in = new Scanner (system.in); Fileoperator.select (); int choice = 0; while ((Choice =in.nextint ())!=-1) {switch (choice) {case-1: system.exit (0); Break;case 1:fileoperator.findtableinput ( Tbls,in); Break;case 2:fileoperator.deletetableinput (tbls,in); Break;case 3:fileoperator.addtable (Tbls,in); Break;case 4: Fileoperator.printtables (TBLs); Break;case 5:fileoperator.edittableinput (TBLs, in); BREAK;DEFAULT:SYSTEM.OUT.PRINTLN ("Input numeric error please reenter");} Fileoperator.select ();}}}

Effect:

-----------------------------------------

Enter the number to select the function:

1: Find the course according to the course number;

2: Delete the course according to the course number:

3: Add a course record to the curriculum:

4: Show all course records in curriculum

5: Revise curriculum record in curriculum

-1: Exit

-----------------------------------------

Function Selection:4

Table [key=c001, rest= Program Design Foundation 4 Jiang Construction]

Table [key=c002, rest= microcomputer principle and Application 5 sheet steel]

Table [key=c003, rest= advanced mathematics 6 Li Ming]

Table [key=c004, rest= Discrete Mathematics 5 Zhao Society]

Table [key=c005, Rest= World Modern History 2 Chen]

Table [key=c006, rest= data Structure (Java Edition) 8 Wang Kai]

-----------------------------------------

Enter the number to select the function:

1: Find the course according to the course number;

2: Delete the course according to the course number:

3: Add a course record to the curriculum:

4: Show all course records in curriculum

5: Revise curriculum record in curriculum

-1: Exit

-----------------------------------------

Function selection:2

Please enter the curriculum you want to delete:C006

Delete number: [C006] Course success!

-----------------------------------------

Enter the number to select the function:

1: Find the course according to the course number;

2: Delete the course according to the course number:

3: Add a course record to the curriculum:

4: Show all course records in curriculum

5: Revise curriculum record in curriculum

-1: Exit

-----------------------------------------

Function selection:1

Please enter the curriculum you want to find:C005

The corresponding curriculum is: Table [key=c005, Rest= World Modern History 2 Chen]

-----------------------------------------

Enter the number to select the function:

1: Find the course according to the course number;

2: Delete the course according to the course number:

3: Add a course record to the curriculum:

4: Show all course records in curriculum

5: Revise curriculum record in curriculum

-1: Exit

-----------------------------------------

Function Selection:3

Please enter the curriculum you want to add:C006 Chinese Modern history 1 Lin

Add a curriculum: C006 success!

-----------------------------------------

Enter the number to select the function:

1: Find the course according to the course number;

2: Delete the course according to the course number:

3: Add a course record to the curriculum:

4: Show all course records in curriculum

5: Revise curriculum record in curriculum

-1: Exit

-----------------------------------------

Function Selection:4

Table [key=c001, rest= Program Design Foundation 4 Jiang Construction]

Table [key=c002, rest= microcomputer principle and Application 5 sheet steel]

Table [key=c003, rest= advanced mathematics 6 Li Ming]

Table [key=c004, rest= Discrete Mathematics 5 Zhao Society]

Table [key=c005, Rest= World Modern History 2 Chen]

Table [key=c006, rest= History of China 1 Lin]

-----------------------------------------

Enter the number to select the function:

1: Find the course according to the course number;

2: Delete the course according to the course number:

3: Add a course record to the curriculum:

4: Show all course records in curriculum

5: Revise curriculum record in curriculum

-1: Exit

-----------------------------------------

Function Selection:5

Please enter the curriculum you want to modify:C006 Java programming 8 Lin

Change the course number to [C006] success!

-----------------------------------------

Enter the number to select the function:

1: Find the course according to the course number;

2: Delete the course according to the course number:

3: Add a course record to the curriculum:

4: Show all course records in curriculum

5: Revise curriculum record in curriculum

-1: Exit

-----------------------------------------

Function Selection:4

Table [key=c001, rest= Program Design Foundation 4 Jiang Construction]

Table [key=c002, rest= microcomputer principle and Application 5 sheet steel]

Table [key=c003, rest= advanced mathematics 6 Li Ming]

Table [key=c004, rest= Discrete Mathematics 5 Zhao Society]

Table [key=c005, Rest= World Modern History 2 Chen]

Table [key=c006, Rest=java programming 8 Lin]

-----------------------------------------

Enter the number to select the function:

1: Find the course according to the course number;

2: Delete the course according to the course number:

3: Add a course record to the curriculum:

4: Show all course records in curriculum

5: Revise curriculum record in curriculum

-1: Exit

-----------------------------------------

Feature Selection:-1

Data structure (Java version) practice collection Simple Book Management system