How to read multi-line text input using Scanner.nextLine() method in Java?

In Java, Scanner is a very useful class, which is particularly convenient when reading user input. When reading a single line of text input, we can use the Scanner.nextLine() method. But what do we do when we need to read multiple lines of text input?

This article will introduce you to how to use the Scanner.nextLine() method in Java to read multi-line text input and provide specific code examples. let's start!

First, we need to understand some basic knowledge. The nextLine() method in the Scanner class is used to read an input line of text. When a newline character is read, the method stops reading and returns the input string. Therefore, we can use this method to read multi-line text input. Here is a simple code example:

Scanner scanner = new Scanner(System.in);
String line = scanner.nextLine();
System.out.println("输入的文本是：" + line);

If we want to read multi-line text input, we can follow these steps:

1. Create a Scanner object:

Scanner scanner = new Scanner(System.in);

2. Use a loop to continuously read multiple lines of text input:

while (scanner.hasNextLine()) {
  String line = scanner.nextLine();
  System.out.println("输入的文本是：" + line);
}

In this loop, we continuously call the Scanner's hasNextLine() method to check whether there is The next line of input is readable. If there is, we use the nextLine() method to read it and output it to the console.

3. When we want to end the input and break out of the loop, we can let the user enter a specific end symbol, such as a blank line or a specific character. For example, in the following example, we let the user enter multiple lines of text and stop after entering a blank line:

Scanner scanner = new Scanner(System.in);
System.out.println("请输入多行文本。输入一个空行可停止输入：");

while (scanner.hasNextLine()) {
  String line = scanner.nextLine();
  if (line.isEmpty()) {
    break; // 结束循环
  }
  System.out.println("输入的文本是：" + line);
}

In this example, we first output a prompt message telling the user how to stop enter. We then use a loop to read each line of user input and check if the line is an empty line. If it is a blank line, we use the break statement to end the loop.

The above is the method and code example of how to use the Scanner.nextLine() method in Java to read multi-line text input. This method is very convenient, especially when you need to read the contents of a file or process large amounts of text data. I hope this article can help you use the Scanner class better!

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