Array

[phantom06]

public CD2(String title, String singer, double price, String category, String discount, String [] track,
String[]time,int numSong)

CD2 C = new CD2(arr[0], arr[1], Double.parseDouble(arr[2]), arr[3], arr[4],
arr[5],arr[6],Integer.parseInt(arr[7]));


Like in the code above, where i use Double.parseDouble(arr[2]) to change it to double, how to change the arr[5] to array?

[mine0926]

Array of what? string, character?
You can use split() or toCharArray() method;

String[] arr2 = arr[5].split(",");
char[] arrChar = arr[5].toCharArray();