this is a assignment program read a list of values from a text file use length function to calculate the size of a file name use substring to select some letters from a text value
read the file values into an array display all the array values in full as well as the length of each string display the end section of all array values display the start of some array values which match a target value substring: start/end, using if()
sometime substring is used to select characters at the end of the string
the position at the end of a string depends on how long the string is, so the length function helps
select characters at start / end of a string: use the length of the string to help select the last character
start always begins at position 0, the length of the first string is 9, the second 12 and the third 11 end is always at the position given by the length of the string, use this for the second parameter count back from the end for a substring at the end of a string to calculate the first parameter, using (-2) gives the last two characters
substring can be used with an if condition and the .equals function
Use substring with an if() conditional construct to decide option based on substring value constructs used
file handling
data structure
• string array
control structure
Input requirements
Sample data from file, file names including the file type extension
Output requirements
Display full file list with name and extension
file extensions only for all files
png files, display without extension
design: main steps
code: repl program