Read and Write file

Suppose that we already have a file which contains the students’ records (See file Student.txt). Each student record includes following information: Fullname, Location, Age in that order. You should write a program to read that file and create another file (named Student_copied.txt) with the contents as follows:
• FullName: Copy and change to uppercase letters in new file.
• Location, Age: Copy exactly the content of old file.
In this exercise, you should specify only file name, don’t specify the path. For
example: new FileWriter("Student_copied.txt").

Code:

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Nguyen Xuan Phuong    ------->  NGUYEN XUAN PHUONG //uppercase
Hcm                                          Hcm //the same
19                                            19
Nguyen Van Ngoc                        NGUYEN VAN NGOC //uppercase
Hcm                                          Hcm//the same
20                                            20

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This is my code:

Code:

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public static void main(String[] args) {
                String line;
                try {
                        BufferedReader bufferedReader = new BufferedReader(new FileReader("Student.txt"));
                        PrintWriter print = new PrintWriter(new FileWriter("Student_copied.txt"));
                                               
                        while (true) {
                                line = bufferedReader.readLine();
                                if(line == null)
                                        break;
                       
                        String str = line.toUpperCase();
                        print.println(str);                       
                        }
                       
                        bufferedReader.close();
                        print.close();
                       
                } catch (Exception e) {
                        e.printStackTrace();
                }
        }
}

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My code made all lines uppercase but
I want to uppercase just the line of name.

Just use a basic validation there. I mean checking the length or else.

If not simply you can an index there.

Quote:

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I want to uppercase just the line of name

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If the name is on the first line, only uppercase the first line.
Test which line you are looking at before doing the uppercase.

Yes, that's the first line I wanna do the uppercase. But I am not sure how to do.

Use an if () statement with a counter or boolean to determine which is the first line.
if(<firstline?> {
<uppercase>
}
increment a counter as each line is read. the counter will only have the initial value the first time, after that it will have greater values.

Nguyen Xuan Phuong//toUpperCase
HCM
19
Nguyen Van Ngoc//toUpperCase
HCM
20
Nguyen Phong//toUpperCase
Hanoi
21
Nguyen Thi Hoa//toUpperCase
Hanoi
20
I want to do the uppercase these lines, I'm in stuck.:(

How do you identify which line you want to UC? Can you use that technique in your program?
It looks like the lines to UC are 1, 4, 7, 10, 13, etc => the pattern is the first line, count 3, then UC, count 3 then UC etc
So what can you do in your program to associate an int value with each line?

How would you do it with your fingers? You fold them done as each line is read.

Code:

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It looks like the lines to UC are 1, 4, 7, 10, 13, etc
 => the pattern is the first line, count 3, then UC, count 3 then UC etc

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This is what I'm thinking to do. But I dont know how to code.

use an int for the counter.
Add one to the counter for each line read
reset the value to 0 after the third line is read
us an: if(anInt == aValue) {} to detect the desired lines.
The first line would be counter=0 and the last of 3 lines would be 2

Here is a simple logic to do this. Carefully look at what happen there, specially on the counter value handling.

Code:

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            int count = 0;
            while (true) {
                line = bufferedReader.readLine();
                if(line == null)
                    break;
               
                // Print the result
                if(count == 0) {
                    print.println(line.toUpperCase());
                }
                else {
                    print.println(line);                       
                }
               
                // Handling the counter
                count++;
                if(count == 3)
                    count = 0;   
            }

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This is what I've done following checking length(). But I wanna know the way to do read line for later exercises.

Code:

---

while (true) {
                                line = bufferedReader.readLine();
                                if (line == null)
                                        break;
                                if (line.length() > 10)
                                        print.println(line.toUpperCase());
                                else
                                        print.println(line);
                        }

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Thanks so much.

Reading the length is not a good practice actually. There is no guarantee that name length is less than 10. Avoid that bad way.

very hard to understand java of long length

Quote:

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Originally Posted by presh4u

very hard to understand java of long length

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What are you doing here in this forum. If you try to spam the forum, please stop it. May you get band in our community.