What does ln mean in java

Ln in Java is the abbreviation of "line", which is used to represent a line of text. It has the following usage: The ln() method of the Scanner class for reading a line of text from the input stream. The ln() method of the PrintWriter class for writing a line of text in the output stream. FileReader and FileWriter The ln() method of the class is used to read and write a line of text from the file respectively.

What does ln mean in Java?

ln is the abbreviation of "line" in Java, which means a line of text. It is used in various ways, depending on the context.

ln in string

When used in Java strings, ln represents a newline character. It is a control character that can be used to wrap text in a string to the next line. For example:

<code class="java">String text = "Hello\nWorld!";
System.out.println(text); // 输出：Hello
                             //        World!</code>

The ln() method of the Scanner class

The ln() method of the Scanner class is used to read a line of text from the input stream. It returns the string representation of the input line, including newlines. For example:

<code class="java">Scanner scanner = new Scanner(System.in);
String input = scanner.nextLine(); // 读取下一行输入并将其存储在 input 中</code>

ln() method of PrintWriter class

The ln() method of PrintWriter class is used to write a line of text in the output stream. It writes the given string to the stream, appending a newline character. For example:

<code class="java">PrintWriter writer = new PrintWriter("myfile.txt");
writer.println("Hello World!"); // 写入“Hello World!”并追加换行符到文件</code>

The ln() method of the FileReader and FileWriter classes

The ln() method of the FileReader and FileWriter classes are used to read a line of text from the file and to File writes a line of text. Their operation is similar to the ln() method of the Scanner and PrintWriter classes, but adapted for file operations.

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