Use java's Scanner.nextLine() function to read an entire line of user input

Use Java's Scanner.nextLine() function to read the entire line of user input

In Java programming, we often need to obtain input from the user. Scanner is a class in the Java standard library that provides a convenient way to read user input. Among them, the Scanner.nextLine() function can help us read the entire line of user input.

Scanner.nextLine() function is used to read the next line of input and return a string. It will always read an entire line, including newlines. Below is a sample code that demonstrates how to use the Scanner.nextLine() function to read user input and process it.

import java.util.Scanner;

public class UserInputExample {
    public static void main(String[] args) {
        // 创建Scanner对象
        Scanner scanner = new Scanner(System.in);

        // 提示用户输入
        System.out.print("请输入你的名字：");

        // 使用nextLine()函数读取用户输入的一整行
        String name = scanner.nextLine();

        // 输出用户输入的名字
        System.out.println("你的名字是：" + name);

        // 关闭Scanner对象
        scanner.close();
    }
}

The above code first creates a Scanner object and associates it with the standard input stream (System.in). Then, the user is prompted for their name by calling the System.out.print() function. Next, use the Scanner.nextLine() function to read an entire line of user input and save it as a string variable name. Finally, the name entered by the user is output to the console.

Run this code, you will see the following output:

请输入你的名字：John
你的名字是：John

In this example, we successfully read an entire line of user input through the Scanner.nextLine() function, and Save it to a string variable.

In addition to reading an entire line of user input, the Scanner class also provides other methods to read different types of input. For example, the Scanner.nextInt() function can be used to read an integer, the Scanner.nextDouble() function can be used to read a double-precision floating point number, and so on. You can choose the appropriate method to read user input based on your needs.

To summarize, in Java programming, an entire line of user input can be easily read through the Scanner.nextLine() function. This provides convenience for us to write interactive programs. I hope the above sample code can help you better understand and use the Scanner.nextLine() function.

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