as you need toread the file line by lineand insert each line into anArrayList, but from Java 7 onward, you can use the utility methodFiles.readAllLines()to read all lines of a text file into a List. This method returns aListofStringthat contains all lines of files. Later you...
readList.add(temp); } read.close();returnreadList; }catch(Exception e) { e.printStackTrace(); }returnnull; }//改变时间的格式publicstaticString parseDate(String dateStr)throwsjava.text.ParseException{ SimpleDateFormat input_date=newSimpleDateFormat("dd/MMM/yyyy:HH:mm:ss Z", Locale.ENGLISH)...
If, for an example, our file contains a long list that we want to sort, we'll have to read it into an adequate data structure, perform operations, and then persist it once again - in this case anArrayList. This can be achieved with several different approaches: Files.readAllLines() File...
Remember that reading the whole file into memory isrecommended only for small text fileswhere we may want to refer to the file content multiple times in the program. In such cases, reading the file multiple times is not an ideal solution. So we must read the file content once in theList,...
Read text file with InputStreamReader InputStreamReaderis a bridge from byte streams to character streams. It reads bytes and decodes them into characters using a specified charset. Main.java import java.io.BufferedReader; import java.io.FileInputStream; ...
You can also use the Files class from the java.nio.file package to read a text file in Java. Here's an example of how to use the Files class to read a text file: import java.nio.file.Files; import java.nio.file.Paths; import java.util.List; public class Main { public static voi...
Finally, we print the content of the file. This approach simplifies file reading in Java 7 and is concise and efficient for reading text files into strings. 3. How to read String from file using Scanner As I said before, the Java programming language offers various methods to read data...
// read all lines List<String> lines = Files.readAllLines(Paths.get("C:/Users/Administrator/Desktop/result.txt")); // print all lines lines.forEach(System.out::println); } catch (IOException e) { e.printStackTrace(); } } } 更多的读写文件的代码可以参考java-read-write-text-files。 上...
What is simplest way toread a fileintoString? Do you want to read aplain textfile in Java? How do you want to convert aFile objectto a String object? There are multiple ways we can read a file and covert it to String. There are 5 total ways to convert whole text file to a String...
Opens a file for reading, returning a BufferedReader that may be used to read text from the file in an efficient manner. Bytes from the file are decoded into characters using the specified charset. Reading commences at the beginning of the file. The Reader methods that read from the file ...