In this post, we will learn “How to write String to a file in Java 11?”. Java 11 introduced writeString() API to do that.
Here, we are going to learn following things:
- What is writeString() API?
- How to use it?
Write String to a File in Java 11 using writeString method?...!!! Share on X
Let’s Begin,
1. What is writeString() API?
Java 11 introduced two new overloaded methods as part of java.nio.file.Files class.
Path writeString(Path path, CharSequence csq, OpenOption… options):
- This method write a CharSequence to a file. Characters are encoded into bytes using the
UTF-8charset. - This method is equivalent to:
writeString(path, test, StandardCharsets.UTF_8, options)
Path writeString(Path path, CharSequence csq, Charset cs, OpenOption… options):
- This method write a CharSequence to a file. Characters are encoded into bytes using the specified charset.
- All characters are written as they are, including the line separators in the char sequence. No extra characters are added.
- The
optionsparameter specifies how the file is created or opened. If no options are present then this method works as if theCREATE,TRUNCATE_EXISTING, andWRITEoptions are present. In other words, it opens the file for writing, creating the file if it doesn’t exist, or initially truncating an existingregular-fileto a size of0.
2. How to use it?
Let’s take an example where we have a File (TestingFile.txt). Now, we are going to write some string content onto that File using writeString API.
Note: In below example, after writing into the file, we are performing a check to make sure string is successfully written onto the file.
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.LinkOption;
import java.nio.file.Path;
import java.nio.file.Paths;
public class Write_String_To_File_Java11 {
public static void main(String[] args) {
//Make sure file exists at below location
var File_Path = Paths.get("/Users/d33p4k/Docs/TestingFile.txt");
try {
//Write "This is Techndeck" string into the above file using writestring
Files.writeString(File_Path, "This is Techndeck", LinkOption.values());
//Now Check String successfully written in the file
checkFileContainsString(File_Path);
} catch (IOException ex) {
ex.printStackTrace();
}
}
public static void checkFileContainsString(Path p) throws IOException {
var File_Content = Files.readString(p);
System.out.println("String present in the file is: " + File_Content);
}
}
Output:
String present in the file is: This is Techndeck
Write String to a File in Java 11 using writeString method?...!!! Share on X
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