Java uses the next() function of the Scanner class to obtain the next string input by the console

Java uses the next() function of the Scanner class to obtain the next string entered by the console

Java is a powerful programming language with many convenient and practical classes and functions. The Scanner class is one of the important classes used to obtain user input in Java. It can read data from multiple sources such as console and files, and is a powerful tool for processing input streams.

In Java, to get the next string input by the console, you can use the next() function of the Scanner class. This function reads the next space- or newline-delimited string from the input stream and returns this string.

The following is a sample code that shows how to use the next() function of the Scanner class to obtain the string entered by the user:

import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        // 创建Scanner对象
        Scanner scanner = new Scanner(System.in);
        
        System.out.print("请输入一个字符串：");
        // 使用next()函数获取下一个字符串
        String str = scanner.next();
        
        System.out.println("您输入的字符串是：" + str);
        
        // 关闭Scanner对象
        scanner.close();
    }
}

In this sample code, we first create a Scanner object scanner, used to read console input. Then, use the System.out.print() function to output prompt information and ask the user to enter a string. Next, use the scanner.next() function to obtain the string entered by the user and assign it to the variable str. Finally, use the System.out.println() function to output the string entered by the user.

Run this code, the console will display the prompt message "Please enter a string:", and then wait for user input. After the user enters the string and presses the Enter key, the program will print the string entered by the user on the console.

It should be noted that the next() function will only return the next string separated by spaces or newlines. If the string entered by the user contains spaces, only the part before the spaces will be returned. If you want to get a complete line of input, you can use the nextLine() function of the Scanner class.

In addition, in order to avoid wasting resources, the Scanner object should be closed after using it. This can be done using the scanner.close() function.

The Scanner class in Java provides many other convenient functions, such as nextInt(), nextFloat(), etc., which can be used to read different types of data. By mastering the use of various functions of the Scanner class, you can process user input more efficiently.

In short, the next() function of the Scanner class is an important tool in Java to obtain the next string input by the console. By properly applying the Scanner class, we can easily handle user input and achieve a richer interactive experience. I hope this article will be helpful to you when using the Scanner class to obtain user input!

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