How to read input in java

Read input through the Scanner class: Import the java.util.Scanner package. Create a Scanner object with System.in as the parameter. Read the input using methods such as nextLine() or nextInt().

How to read input using Java

In Java, there are many ways to read input. The most common way is to use the Scanner class.

Reading input using the Scanner class

To read input using the Scanner class, follow these steps:

1. Importjava.util.Scanner package.
2. Create a Scanner object with the parameter System.in, representing standard input.
3. Use methods such as nextLine() or nextInt() of the Scanner object to read input.

Sample code:

import java.util.Scanner;

public class ReadInput {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        System.out.println("输入你的姓名：");
        String name = scanner.nextLine();

        System.out.println("输入你的年龄：");
        int age = scanner.nextInt();

        System.out.printf("你的姓名是 %s，年龄是 %d。", name, age);

        scanner.close();
    }
}

Other methods of reading input

In addition to using the Scanner class, you can also Read input using:

• BufferedReader: Provides higher level input reading control, such as line-by-line reading.
• Console: Provides access to the Java console and can directly read keyboard input.
• System.in: Standard input stream, you can also read input directly, but it is more cumbersome to use.

Choose the appropriate method

The exact method of reading input you use depends on the needs and complexity of your application. For simple input reading, the Scanner class is usually a good choice. For higher level or customized input handling, BufferedReader or Console may be better choices.

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