// CIS 790       JAVA         PROF.  AUCIELLO

// this document contains 12 Java Applications that run on a DOS platform.  
// the goal of these is to develop student skills in interactive designing, testing,
// debugging,  and improving programs.   Java applications form an excellent
// set of examples to work with -- easy to compile,  quick to debug,  and 
// have a powerful set of library functions.   Get into this project.  Take them
// apart -- reverse engineer them -- reassamble, improvise, transfer concepts from
// one program to the other!   Show off what you can do!    Acknowledgement to
// Prof. Susan Silvera for inspiring this assignment.   


// APPLICATION 01
public class Hello
{
  public static void main(String args[])
    { System.out.println("Hello "+args[0]+"!"); }
}

// APPLIC 02 (BOOLEAN)
public class QuickTest 
{ public static void main(String args[])
  { System.out.println("5 is greater than 6:"+(5>6));
    System.out.println("6 is greater than or equal to 3:"+(6>=3));
    System.out.println("8 is less than 10:"+(8<10));
  }
}


// APPLIC 03
// all class name and file name will be in lower case.
class p011
  { public static void main (String args[])
      {
        System.out.println("Hello World!");
        System.out.println("Is this worth all the  trouble?");
        System.out.println("I sure hope and think so!");
      }
  }


// APPLIC 04  (toString)
class LiteralTest 
  { public static void main(String args[]) 
      {	StringBuffer sb = new StringBuffer("Innocuous Display Message");
	System.out.println(sb.toString()); }
  }
/*  sb = name of instance of new StringBuffer class.
    to.string method converts buffered string to string.
*/



.. APPLIC 05 (do ... while)
/*  CIS 790      790q3.htm */

// import javaio.*
 class loop
   { public static void main (String args[])
       { int x = 1;
          do { System.out.println("Hello World, " + x);
               x++;
             } // ends do
          while (x <= 10);
       }
   } // ends class
     

// APPLIC 06 (sequentially reads a file)
import java.io.*;
class read
 {
  public static void main(String args[]) {
  byte buffer[] = new byte[2056];
  try {
   FileInputStream fileIn = new FileInputStream("read.java");
   int bytes = fileIn.read(buffer,0,2056);
   try{
    String str = new String(buffer,0,bytes, "Default");
    System.out.println(str);
    }catch (UnsupportedEncodingException e){
     System.out.println("The encoding \"Default\"was not found :"+e);
    }
   }
   catch (Exception e) {
    String err = e.toString();
    System.out.println(err);
   }
  }
 }


// APPLIC 07 (input and output of a single character)
// CIS 790      JAVA PROGRAMMING    PROF.  AUCIELLO
//  TOPICS:
/*         .  input - output libraries
           .  try ... catch (error trapping)
           .  KB input and Display output.
*/

import java.io.*;

class kb1a 
  { public static void main(String args[])
      { char c;
        
        try
           { System.out.println("Prints just the 1st char.");
             System.out.print("Type a Character: ");
             c = (char)System.in.read();
             System.out.println("You typed ......: " + c);
           }

        catch (Exception e)
           { String err = e.toString();
             System.out.println(err);
           } // end try-catch.


      } // end main procedure.
  } // end class 



// APPLIC 08 (reads any file)
import java.io.*;

class f8
  { public static void main(String args[])
      { byte buff2[] = new byte[64];
        byte buffer[] = new byte[2056];

        try
           { FileInputStream fileIn = new FileInputStream("f8.java");
             int bytes = fileIn.read(buffer,0,2056);
             System.out.println(bytes);
             String str = new String(buffer,0,bytes, "Default");
             System.out.println("Length of str = " + str.length());
             System.out.println("Press any key to start.");
             System.in.read(buff2, 0, 64);
             System.out.println(str);
           }
        catch (Exception e)
           { String err = e.toString();
             System.out.println(err);
           } // end try-catch.
      } // end main procedure.
  } // end class 
/* line 1
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*/


// APPLIC 09 (input & output of chars and strings)
// CIS 790      JAVA PROGRAMMING    PROF.  AUCIELLO
//  TOPICS:
/*         .  input - output libraries
           .  creating array of bytes
           .  try ... catch (error trapping)
           .  KB input and Display output.

*/
import java.io.*;

class kb1  
  { public static void main(String args[])
      { byte buff2[] = new byte[64];
        byte buffer[] = new byte[2056];
        char c;
        
        // System.out.println(" Enter File name: ");   
        StringBuffer buff1 = new StringBuffer();

        try
           {   System.out.println("This exercise will print out");
               System.out.println("the 1st char entered, then 'echo'");
               System.out.println("the entire string up to the <enter> key");             

               c = (char)System.in.read();
               System.out.println("1st Char in Char format = " + c);
               buff1.append(c);

               while
                 ( (c = (char)System.in.read()) != '\n' )
                    buff1.append(c);
                    System.out.println(buff1);
           }

           
        catch (Exception e)
           { String err = e.toString();
             System.out.println(err);
           } // end try-catch.

      } // end main procedure.
  } // end class 



// APPLIC 10 (i/o of strings [2nd method])
// CIS 790      JAVA PROGRAMMING    PROF.  AUCIELLO
//  TOPICS:
/*         .  input - output libraries
           .  creating array of bytes
           .  try ... catch (error trapping)
           .  Opening a file
           .  counting # of bytes in file.
           .  KB input and Display output.
*/

import java.io.*;
import java.lang.String;
import java.io.InputStream;

class kb4
    
  { public static void main(String args[])
      { byte buff2[] = new byte[64];
        byte buffer[] = new byte[2056];
        char c;
        String charin;
        try
           { 
             // 1st try:
             System.out.print  ("Enter String: ");
             System.in.read(buff2, 0, 64);
             String str5 = new String(buff2,0);
             System.out.println("You typed:    " + str5);
 
             // 2nd try:  (for character only.)
             System.out.print("Type a Single Character ");
             c = (char)System.in.read();
             System.out.println("You typed .......      :" + c);

           }

        catch (Exception e)
           { String err = e.toString();
             System.out.println(err);
           } // end try-catch.


      } // end main procedure.
  } // end class 


// APPLIC 11 (reading a file)
// CIS 790      JAVA PROGRAMMING    PROF.  AUCIELLO

//  TOPICS:
/*         .  input - output libraries
           .  creating array of bytes
           .  try ... catch (error trapping)
           .  Opening a file
           .  counting # of bytes in file.
           .  KB input and Display output.

*/

import java.io.*;

class f10
  { public static void main(String args[])
      { byte buff2[] = new byte[64];
        byte buffer[] = new byte[2056];

        try
           { FileInputStream fileIn = new FileInputStream("f10.java");
             int bytes = fileIn.read(buffer,0,2056);
             System.out.println("Press any key to start to read file..");
             System.in.read(buff2, 0, 64);
             fileIn.read(buffer,0,64);            
             String str1 = new String(buffer,0);
             System.out.println(" Length of bytes field  + bytes " + "  Length of str1  field = " + str1.length());
             System.out.println(" File has been read.");             
             System.out.println(" Press any key to start to print file..");
             System.in.read(buff2, 0, 64);
             System.out.println(str1);
           }

        catch (Exception e)
           { String err = e.toString();
             System.out.println(err);
           } // end try-catch.


      } // end main procedure.
  } // end class 


// APPLIC 12 (string to integer)
//  method works .. inputs a string convert to integer.
// CIS 790      JAVA PROGRAMMING    PROF.  AUCIELLO
//  TOPICS:

/*         .  input - output libraries
           .  try ... catch (error trapping)
           .  KB input and Display output.
           .  String input.
           .  Convert String to Integer
           .  Try ... Catch 
*/

import java.io.*;
import java.lang.String;

class kb5
  { public static void main(String args[])
      { byte buff2[] = new byte[64];

        try
           { System.out.print  ("Enter Integer Value: ");
             System.in.read(buff2, 0, 64);
             String str5 = new String(buff2,0);
             System.out.println("You typed - str5 =  :   " + str5);
             int l1 = str5.length();
             System.out.println("Length of str5 (before trimming) = " + l1);
             String str6 = str5.trim();
             System.out.println("Len of str5(trimmed)  = " + str6.length());

             System.out.println(" ");
             System.out.println("Example of converting string to Integers");
             int i5 = Integer.parseInt(str6);
             int i6 = i5 + 1;
             System.out.println(i6);             
           } // end try.

        catch (Exception e)
           { String err = e.toString();
             System.out.println(err);
           } // end catch.

      } // end main procedure.
  } // end class