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Java I/O Programming: Exercises, Practice, Solution

Java Input-Output Exercises [18 exercises with solution]

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1. Write a Java program to get a list of all file/directory names in the given directory.
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2. Write a Java program to get specific files with extensions from a specified folder.
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3. Write a Java program to check if a file or directory specified by pathname exists or not.
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4. Write a Java program to check if a file or directory has read and write permissions.
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5. Write a Java program to check if the given pathname is a directory or a file.
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6. Write a Java program to compare two files lexicographically.
According to Wikipedia:
In mathematics, the lexicographic or lexicographical order (also known as lexical order, dictionary order, alphabetical order or lexicographic(al) product) is a generalization of the way the alphabetical order of words is based on the alphabetical order of their component letters. This generalization consists primarily in defining a total order over the sequences (often called words in computer science) of elements of a finite totally ordered set, often called alphabet.
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7. Write a Java program to determine the last modified date of a file.
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8. Write a Java program to read input from the Java console.
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9. Write a Java program to get the file size in bytes, KB, MB.
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10. Write a Java program to read the contents of a file into a byte array.
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11. Write a Java program to read file content line by line.
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12. Write a Java program to read a plain text file.
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13. Write a Java program to read a file line by line and store it in a variable.
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14. Write a Java program to store text file content line by line in an array.
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15. Write a Java program to write and read a plain text file.
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16. Write a Java program to append text to an existing file.
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17. Write a Java program to read the first 3 lines of a file.
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18. Write a Java program to find the longest word in a text file.
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Do not submit any solution of the above exercises at here, if you want to contribute go to the appropriate exercise page.



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Java: Tips of the Day

Difference between jar and war in Java

From Java Tips: Difference between ear jar and war files:

These files are simply zipped files using the java jar tool. These files are created for different purposes. Here is the description of these files:

  • .jar files: The .jar files contain libraries, resources and accessories files like property files.
  • .war files: The war file contains the web application that can be deployed on any servlet/jsp container. The .war file contains jsp, html, javascript and other files necessary for the development of web applications.

Ref: https://bit.ly/31hFDog

 





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