Java Fundamentals Hardening IO flow notes 45:io stream exercises data stored in a collection into a text file case

1. Store the data in the collection into a text file case:

Requirement: To store string data in the ArrayList collection into a text file?

(1) Analysis:
Through the meaning of the topic, we can know some of the following things,
A string is stored in the ArrayList collection.
Traverse the ArrayList collection to get the data.
It is then stored in a text file.
The text file description uses a character stream .

(2)

Data Source :

Arraylist<string>--Traversal to get each string of data

Destination :

A.txt--FileWriter--BufferedWriter

2. code example:

1  Packagecn.itcast_02;2 3 ImportJava.io.BufferedWriter;4 ImportJava.io.FileWriter;5 Importjava.io.IOException;6 Importjava.util.ArrayList;7 8 /*9  * Ten * Data Source: One * arraylist<string>--traverse to get each string data A * Destination: - * A.txt --FileWriter--BufferedWriter -  */ the  Public classArraylisttofiledemo { -      Public Static voidMain (string[] args)throwsIOException { -         //encapsulating a data source (creating a Collection Object) -arraylist<string> array =NewArraylist<string>(); +Array.add ("Hello"); -Array.add ("World"); +Array.add ("Java"); A  at         //Package Destination -BufferedWriter BW =NewBufferedWriter (NewFileWriter ("A.txt")); -  -         //iterating through the collection -          for(String s:array) { -             //Write Data in Bw.write (s); - bw.newline (); to Bw.flush (); +         } -  the         //Freeing Resources * bw.close (); $     }Panax Notoginseng}

Run the effect as follows:

Java Fundamentals Hardening IO flow notes 45:io stream exercises data stored in a collection into a text file case