In Java Language, Write a program, with comments, that creates three text files:
ID: 3761438 • Letter: I
Question
In Java Language, Write a program, with comments, 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
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Scanner;
public class AllGrades {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
String fname="", lname="";
int grade = 0;
File file = null;
PrintWriter writer = null;
try {
file = new File("grade1.txt");
if(!file.exists())
{
file.createNewFile();
}
writer = new PrintWriter(file);
} catch (IOException e) {
e.printStackTrace();
}
for(int i = 0; i < 5; i++)
{
System.out.print("Enter name and grade: ");
fname = input.next();
lname = input.next();
grade = input.nextInt();
writer.print(fname + " " + lname + " ");
writer.println(grade);
}
writer.close();
try {
file = new File("grade2.txt");
if(!file.exists())
{
file.createNewFile();
}
writer = new PrintWriter(file);
} catch (IOException e) {
e.printStackTrace();
}
for(int i = 0; i < 5; i++)
{
System.out.print("Enter name and grade: ");
fname = input.next();
lname = input.next();
grade = input.nextInt();
writer.print(fname + " " + lname + " ");
writer.println(grade);
}
writer.close();
try {
file = new File("grade3.txt");
if(!file.exists())
{
file.createNewFile();
}
writer = new PrintWriter(file);
} catch (IOException e) {
e.printStackTrace();
}
for(int i = 0; i < 5; i++)
{
System.out.print("Enter name and grade: ");
fname = input.next();
lname = input.next();
grade = input.nextInt();
writer.print(fname + " " + lname + " ");
writer.println(grade);
}
writer.close();
try {
file = new File("allgrades.txt");
if(!file.exists())
{
file.createNewFile();
}
writer = new PrintWriter(file);
} catch (IOException e) {
e.printStackTrace();
}
String line;
BufferedReader reader;
String temp[] = null;
try {
reader = new BufferedReader(new FileReader("grade1.txt"));
while((line=reader.readLine()) != null) {
writer.print(line + " ");
temp = line.split(" ");
grade = Integer.parseInt(temp[2]);
if(grade < 60) writer.println("F");
else if(grade >= 60 && grade < 70) writer.println("D");
else if(grade >= 70 && grade < 80) writer.println("C");
else if(grade >= 80 && grade < 90) writer.println("B");
else writer.println("A");
}
} catch (IOException e) {
e.printStackTrace();
}
try {
reader = new BufferedReader(new FileReader("grade2.txt"));
while((line=reader.readLine()) != null) {
writer.print(line + " ");
temp = line.split(" ");
grade = Integer.parseInt(temp[2]);
if(grade < 60) writer.println("F");
else if(grade >= 60 && grade < 70) writer.println("D");
else if(grade >= 70 && grade < 80) writer.println("C");
else if(grade >= 80 && grade < 90) writer.println("B");
else writer.println("A");
}
} catch (IOException e) {
e.printStackTrace();
}
try {
reader = new BufferedReader(new FileReader("grade3.txt"));
while((line=reader.readLine()) != null) {
writer.print(line + " ");
temp = line.split(" ");
grade = Integer.parseInt(temp[2]);
if(grade < 60) writer.println("F");
else if(grade >= 60 && grade < 70) writer.println("D");
else if(grade >= 70 && grade < 80) writer.println("C");
else if(grade >= 80 && grade < 90) writer.println("B");
else writer.println("A");
}
} catch (IOException e) {
e.printStackTrace();
}
writer.close();
try {
reader = new BufferedReader(new FileReader("allgrades.txt"));
while((line=reader.readLine()) != null) {
System.out.println(line);
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
Sample output:
Enter name and grade: F W 36
Enter name and grade: E Q 36
Enter name and grade: G E 54
Enter name and grade: E Y 95
Enter name and grade: E H 86
Enter name and grade: R H 46
Enter name and grade: E N 85
Enter name and grade: B R 75
Enter name and grade: N R 65
Enter name and grade: N T 85
Enter name and grade: B D 82
Enter name and grade: T E 74
Enter name and grade: V Y 35
Enter name and grade: Q S 82
Enter name and grade: X Y 23
F W 36 F
E Q 36 F
G E 54 F
E Y 95 A
E H 86 B
R H 46 F
E N 85 B
B R 75 C
N R 65 D
N T 85 B
B D 82 B
T E 74 C
V Y 35 F
Q S 82 B
X Y 23 F
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.