Java assignment: Write a program that creates three text files : grade1.txt, gra
ID: 3940219 • Letter: J
Question
Java assignment:
Write a program that creates three text files : grade1.txt, grade2.txt, grade3.txt
Each contains 5 students’ names (first name, last name) and grades (integers) that are obtained from the keyboard input.
Combine all three files into one text file: allgrades.txt
-It contains all 15 students' names and grades from the 3 text file.
-It also contains letter grades for each student
If grade < 60, it adds letter grade "F"
If 60 <= grade <70, it adds letter grade "D".
If 70 <= grade < 80, it adds letter grade "C".
If 80 <= grade < 90, it adds letter grade "B".
If 90 <= grade, it adds letter grade "A".
-displays the contents of text file allgrade.txt on the console
Explanation / Answer
///////////////////////////////////////////////// Programme Code Begins ////////////////////////////
import java.util.Scanner; //scanner class to read input
import java.io.BufferedReader;
import java.io.*; //import io package
public class Grades2 //main class begins
{
public static void main(String[] args)throws IOException //main method begins
{
BufferedWriter output = null;
BufferedWriter allout = null;
Scanner sc=new Scanner(System.in);
//try block for write data to allgrades.txt
try
{
File ofile = new File("allgrades.txt");
allout = new BufferedWriter(new FileWriter(ofile));
//////////////////Reading data to grade1.txt in try block///////////////////////////////////////
try
{
File file = new File("grade1.txt");
output = new BufferedWriter(new FileWriter(file));
for(int i=0;i<5;i++)
{
System.out.println("Enter First Name : ");
String fname=sc.next();
System.out.println("Enter Last Name : ");
String lname=sc.next();
System.out.println("Enter Grade Name : ");
int grade=sc.nextInt();
output.write(fname+" "+lname+" "+grade+" "); //write data into grade1.txt
String status="";
//if else ladder to check grade status
if(grade<60)
status="F";
else if(grade>=60 && grade <70)
status="D";
else if(grade>=70 && grade <80)
status="C";
else if(grade>=70 && grade <90)
status="B";
else
status="A";
allout.write(fname+" "+lname+" "+grade+" "+status+" "); //write grades1.txt data into allgrades.txt
}
} catch ( IOException e ) { e.printStackTrace(); }
finally
{
if ( output != null ) { output.close(); }
}
////////////////////////////Reading data to grade2.txt/////////////////////////////////
try
{
File file = new File("grade2.txt");
output = new BufferedWriter(new FileWriter(file));
for(int i=0;i<5;i++)
{
System.out.println("Enter First Name : ");
String fname=sc.next();
System.out.println("Enter Last Name : ");
String lname=sc.next();
System.out.println("Enter Grade Name : ");
int grade=sc.nextInt();
output.write(fname+" "+lname+" "+grade+" ");
String status="";
if(grade<60)
status="F";
else if(grade>=60 && grade <70)
status="D";
else if(grade>=70 && grade <80)
status="C";
else if(grade>=70 && grade <90)
status="B";
else
status="A";
allout.write(fname+" "+lname+" "+grade+" "+status+" ");
}
} catch ( IOException e ) { e.printStackTrace(); }
finally
{
if ( output != null ) { output.close(); }
}
//Reading data to grade3.txt
try
{
File file = new File("grade3.txt");
output = new BufferedWriter(new FileWriter(file));
for(int i=0;i<5;i++)
{
System.out.println("Enter First Name : ");
String fname=sc.next();
System.out.println("Enter Last Name : ");
String lname=sc.next();
System.out.println("Enter Grade Name : ");
int grade=sc.nextInt();
output.write(fname+" "+lname+" "+grade+" ");
String status="";
if(grade<60)
status="F";
else if(grade>=60 && grade <70)
status="D";
else if(grade>=70 && grade <80)
status="C";
else if(grade>=70 && grade <90)
status="B";
else
status="A";
allout.write(fname+" "+lname+" "+grade+" "+status+" ");
}
} catch ( IOException e ) { e.printStackTrace(); }
finally
{
if ( output != null ) { output.close(); }
}
}
catch ( IOException e ) { e.printStackTrace(); }
finally
{
if ( allout != null ) { allout.close(); }
}
//Display the content of file allgrades.txt
System.out.println("Fname LName Grade Status ");
try (BufferedReader br = new BufferedReader(new FileReader("allgrades.txt")))
{
String line = null;
while ((line = br.readLine()) != null) //loop for reading each line in allgrades.txt
{
System.out.println(line); //display each line of output file
}
}
}
}
Note : i am given same input data after 3 entries.You can enter distinct for this programme.
Output :
Fname LName Grade Status
Ashok Kumar 99 A
Rebba Ashok 89 B
A B 45 F
Ashok Kumar 99 A
Rebba Ashok 89 B
A B 45 F
Ashok Kumar 99 A
Rebba Ashok 89 B
A B 45 F
Ashok Kumar 99 A
Rebba Ashok 89 B
A B 45 F
Ashok Kumar 99 A
Rebba Ashok 89 B
A B 45 F
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