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CodeGym /Courses /Java Collections /Tasks | Level 2 | Lesson 2

Tasks | Level 2 | Lesson 2

Java Collections
Level 2 , Lesson 2
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"Hi, Amigo!"

Java university
14
Task
Java Collections, level 2, lesson 2
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Writing to an existing file
The main() method accepts three arguments: 1) fileName - the path to a file; 2) number - a position in the file; 3) text - the text. Write text to the fileName file starting at the position indicated by number. The write operation must overwrite the old data in the file.
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14
Task
Java Collections, level 2, lesson 2
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Using RandomAccessFile
The main() method accepts three arguments: 1) fileName - the path to a file; 2) number - a position in the file; 3) text - the text. Read text from the file, starting from the position indicated by number. The length is the same as the length of the text passed as the third argument.
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Ruslan Skaldin Level 33, Tashkent, Uzbekistan
6 December 2020
Don't know why but when you compare two string it only accepts result with this construction: 

if (text.equals(new String(textInFile))) { ... }
This one doesn't work: 

if (text.equals(Arrays.toString(textInFile))) { ... }
Justin Smith Level 41, Greenfield, USA, United States
19 August 2022
I didn't even compare them in String form. What I used: 

if(Arrays.equals(readBytes, text.getBytes())
I was able to pass using this comparison.
Ewerton Level 30, Belo Horizonte, Brasil
8 July 2019
Writing to existing file: "If the file is too short", means that number will be bigger than your file length. Using RandomAcessFile - helpful example: 

test.txt: Hi, good luck
String[] args = {"C:\test.txt",4,"good"}
Output: 

Hi, good lucktrue