JAVA code Need help with creating a delete button on the following code 1 packag

ID: 3695356 • Letter: J

Question

JAVA code

Need help with creating a delete button on the following code

1 package log;
2

3 import java.io.BufferedWriter;
4 import java.io.FileNotFoundException;
5 import java.io.FileOutputStream;
6 import java.io.IOException;
7 import java.io.OutputStreamWriter;
8 import java.io.PrintWriter;
9 import java.io.Writer;
10 import java.nio.charset.Charset;
11 import java.nio.file.Files;
12 import java.nio.file.Paths;
13 import java.util.ArrayList;
14 import java.util.Date;
15 import java.util.List;
16

17 import javax.swing.JOptionPane;
18 import javax.swing.JPanel;
19

20 /**
21 *
22 * @author Chris
23 * Changes by Matt
24 */
25

26 public class EntryList {
27
28     List<Entry> logbase = new ArrayList<Entry>();
29     JPanel panel = new JPanel();
30     Date today = new Date();
31
32     /**
33      * Constructor
34      * @throws IOException
35      * @throws FileFormatException
36      */
37     public EntryList() throws IOException, FileFormatException{ //LOG BASE HAS BEEN BUILT BUT MUST BE TESTED THOROUGHLY!
38
39         String file = readFile("Logs.txt", Charset.forName("UTF-8"));
40         System.out.println(file.length());
41         if(file.length()<2){
42             System.out.println("Log is Empty");
43         }
44
45         else{
46             String[] entries = file.split("/;E/; ");
47             for(int i = 0; i < entries.length; i++){
48                 System.out.println(entries[i]);                                   //For testing purposes only
49                 String[] words = entries[i].split("/;e;/");
50                 if(words.length > 3)
51                     throw new FileFormatException("File has become corrupt.");
52

53                 long dat = Long.parseLong(words[1]);
54                 logbase.add(new Entry(words[0], words[2], new Date(dat)));
55             }
56         }
57     }
58
59     /**
60      * Method to read the file
61      * @param path
62      * @param encoding
63      * @return
64      * @throws IOException
65      */
66     private String readFile(String path, Charset encoding) throws IOException{
67         byte[] encoded = Files.readAllBytes(Paths.get(path));
68         return new String(encoded, encoding);
69     }
70
71     /**
72      * Add log entry to Logs.txt
73      * @param userName
74      * @param text
75      */
76     public void createLogEntry(String userName, String text){
77     Entry entry = new Entry(userName, text, today);
78     logbase.add(entry);
79         try {
80             updateLogFile();
81         } catch (IOException e) {
82             JOptionPane.showMessageDialog(null, "Error Updating Logs.txt File",
83                 "Error!",JOptionPane.WARNING_MESSAGE);
84             e.printStackTrace();
85         }
86         JOptionPane.showMessageDialog(null, "Successfully added entry",
87                 "Entry List Updated", JOptionPane.WARNING_MESSAGE);
88     }
89
90
91     public void editLogEntry(Entry entry){//TODO
92
93     }
94
95     //Returns entry creation date, creator, and text
96     public String viewLogEntry(Entry entry){
97     return entry.view();
98     }
99
100
101     public void deleteLogEntry(Entry entry){//TODO
102         logbase.remove(entry);
103         try {
104             updateLogFile();
105         } catch (IOException e) {
106             JOptionPane.showMessageDialog(null, "Error Updating Logs.txt File",
107                 "Error!",JOptionPane.WARNING_MESSAGE);
108             e.printStackTrace();
109         }
110         JOptionPane.showMessageDialog(null, "Successfully deleted entry",
111                 "Entry List Updated", JOptionPane.WARNING_MESSAGE);
112     }
113
114
115     /**
116      * Clears Logs.txt file
117      */
118     public void deleteAllLogEntries(){
119         logbase.clear();
120         try {
121             updateLogFile();
122         } catch (IOException e) {
123             JOptionPane.showMessageDialog(null, "Error Updating Logs.txt File",
124                 "Error!",JOptionPane.WARNING_MESSAGE);
125             e.printStackTrace();
126         }
127         JOptionPane.showMessageDialog(null, "Successfully deleted all entries",
128                 "Entry List Updated", JOptionPane.WARNING_MESSAGE);
129     }
130
131
132     /**
133      * Updates log file
134      * @throws IOException
135      */
136     public void updateLogFile()throws IOException{
137     /*FileWriter writer = new FileWriter("Logs.txt", false);
138         try (BufferedWriter bw = new BufferedWriter(writer)) {
139             bw.write(this.toString());
140         }*/
141         Writer out = new BufferedWriter(new OutputStreamWriter(new
142                 FileOutputStream("Logs.txt"), "UTF-8"));
143         try {
144             out.write(this.toString());
145         } finally {
146             out.close();
147         }
148     }
149
150
151     /**
152      * All entries to string formated for saving to file.
153      * @return
154      */
155     @Override
156     public String toString(){
157         String output = "";
158         for(Entry e: logbase){
159             output += e.toString() + "/;E/; ";
160         }
161         return output;
162     }
163 }

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JAVA code Need help with creating a delete button on the following code 1 packag

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