Add to git

Author: phongus

.idea/uiDesigner.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="jdk" jdkName="1.7" jdkType="JavaSDK" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

17.3 FileDemonstration/17.3 FileDemonstration.iml

@@ -0,0 +1,52 @@
+/**
+ * Fig. 17.3: FileDemonstration
+ * File class used to obtain file and directory information.
+ **/
+import java.io.File;
+import java.util.Scanner;
+
+public class FileDemonstration
+{
+    public static void main(String [] args)
+    {
+        Scanner input = new Scanner(System.in);
+
+        System.out.print("Enter file or directory name: ");
+        analyzePath(input.nextLine());
+    }   //  end main
+
+    //  display information about file user specifies
+    public static void analyzePath(String path)
+    {
+        //  create File object based on user input
+        File name = new File(path);
+
+        if (name.exists())  //  if name exists, output information about it
+        {
+            //  display file (or directory) information
+            System.out.printf(
+                    "%s%s\n%s\n%s\n%s\n%s%s\n%s%s\n%s%s\n%s%s\n%s%s",
+                    name.getName(), " exists",
+                    (name.isFile() ? "is a file" : "is not a file"),
+                    (name.isDirectory() ? "is a directory" : "is not a directory"),
+                    (name.isAbsolute() ? "is absolute path" : "is not absolute path"),
+                    "Last modified: ",
+                    name.lastModified(), "Lengeth: ", name.length(),
+                    "Path: ", name.getPath(), "Absolute path: ",
+                    name.getAbsolutePath(), "Parent: ", name.getParent());
+
+            if (name.isDirectory()) // output directory listing
+            {
+                String[] directory = name.list();
+                System.out.println("\n\nDirectory contents:\n");
+
+                for (String directoryName : directory)
+                    System.out.println(directoryName);
+            }   //  end if
+        }
+        else // not file or directory, output error message
+        {
+            System.out.printf("%s %s", path, "does not exist.");
+        }   //  end else
+    }   //  end method analyzePath
+}   //  end class FileDemonstration

17.3 FileDemonstration/src/FileDemonstration.java

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="jdk" jdkName="1.7" jdkType="JavaSDK" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

17.4 Sequential-Access Text Files/17.4 Sequential-Access Text Files.iml

@@ -0,0 +1,75 @@
+/**
+ * Fig. 17.4: AccountRecord.java
+ * AccountRecord class maintains information for one account.
+ */
+
+public class AccountRecord
+{
+    private int account;
+    private String firstName;
+    private String lastName;
+    private double balance;
+
+    //  no-argument constructor calls other constructor with default values
+    public AccountRecord()
+    {
+        this(0, "", "", 0.0);   //  call four-argument contsructor
+    }
+
+    //  initialize a record
+    public AccountRecord(int acct, String first, String last, double bal)
+    {
+        setAccount(acct);
+        setFirstName(first);
+        setLastName(last);
+        setBalance(bal);
+    }   //  end four-argument AccountRecord constructor
+
+    //  set account number
+    public void setAccount(int acct)
+    {
+        account = acct;
+    }   //  end method setAccount
+
+    //  get account number
+    public int getAccount()
+    {
+        return account;
+    }   //  end method getAccount
+
+    //  set first name
+    public void setFirstName(String first)
+    {
+        firstName = first;
+    }   //  end method setFirstName
+
+    //  get first name
+    public String getFirstName()
+    {
+        return firstName;
+    }   //  end method getFirstName
+
+    //  set last name
+    public void setLastName(String last)
+    {
+        lastName = last;
+    }   //  end method setLastName
+
+    //  get last name
+    public String getLastName()
+    {
+        return lastName;
+    }   //  end method getLastName
+
+    //  set balance
+    public void setBalance(double bal)
+    {
+        balance = bal;
+    }   //  end method setBalance
+
+    //  get balance
+    public double getBalance()
+    {
+        return balance;
+    }   //  end method getBalance
+}   //  end class AccountRecord

17.4 Sequential-Access Text Files/src/AccountRecord.java

@@ -0,0 +1,100 @@
+/**
+ * Fig. 17.5: CreateTextFile.java
+ * Writing data to a sequential text file with class Formatter.
+ */
+
+import java.io.FileNotFoundException;
+import java.lang.SecurityException;
+import java.util.Formatter;
+import java.util.FormatterClosedException;
+import java.util.NoSuchElementException;
+import java.util.Scanner;
+
+public class CreateTextFile
+{
+    private Formatter output;   //  object used to output text to file
+
+    //  enable user to open file
+    public void openFile()
+    {
+        try
+        {
+            output = new Formatter("clients.txt");  //  open the file
+        }   //  end try
+        catch (SecurityException securityException)
+        {
+            System.err.println(
+                    "You do not have write access to this file.");
+            System.exit(1); //  terminate the program
+        }   //  end catch
+        catch (FileNotFoundException fileNotFoundException)
+        {
+            System.err.println("Error opening or creating file.");
+            System.exit(1); //  terminate the program
+        }   //  end catch
+    }   //  end method openFile
+
+    //  add records to file
+    public void addRecords()
+    {
+        //  object to be written to file
+        AccountRecord record = new AccountRecord();
+        Scanner input = new Scanner(System.in);
+
+        System.out.printf("%s\n%s\n%s\n%s\n\n",
+                "To terminate input, type the ned-of-file indicator ",
+                "when you are prompted to enter input.",
+                "On UNIX/Linux/Mac OS X type <ctrl> d then press Enter",
+                "On Windows type <ctrl> z then press Enter");
+
+        System.out.printf("%s\n%s",
+                "Enter account number (> 0), first name, last name and balance.",
+                "? ");
+
+        while (input.hasNext()) //  loop until end-of-file indicator
+        {
+            try //  output values to file
+            {
+                //  retrieve data to be output
+                record.setAccount(input.nextInt());
+                record.setFirstName(input.next());
+                record.setLastName(input.next());
+                record.setBalance(input.nextDouble());
+
+                if (record.getAccount() > 0)
+                {
+                    //  write new record
+                    output.format("%d %s %s %.2f\n", record.getAccount(),
+                            record.getFirstName(), record.getLastName(),
+                            record.getBalance());
+                }   //  end if
+                else
+                {
+                    System.out.println(
+                            "Account number must be greater than 0."
+                    );
+                }   //  end else
+            }   //  end try
+            catch (FormatterClosedException formatterClosedException)
+            {
+                System.err.println("Error writing to file.");
+                return;
+            }   //  end catch
+            catch (NoSuchElementException elementException)
+            {
+                System.err.println("Invalid input.  Please Try again.");
+                input.nextLine();   //  discard input so user can try again
+            }   //  end catch
+
+            System.out.printf("%s %s\n%s", "Enter account number (>0),",
+                    "first name, last nawe and balance.", "? ");
+        }   //  end while
+    }   //  end method addRecords
+
+    //  close file
+    public void closeFile()
+    {
+        if (output != null)
+            output.close();
+    }   //  end method closeFile
+}   //  end class CreateTextFile