What is the input statement of java

Input and output can be said to be the basic functions of a computer. As a language system, Java is mainly implemented according to the stream mode. The flow direction of data is determined according to the direction of the computer. The data flow flowing into the computer is called the input stream (inputStream), and the data flow sent by the computer is called the output stream (outputStream).

In the Java language system, the main operations on data flow are encapsulated in the java.io package. The computer's data input and output operations can be realized through the classes in the java.io package. When writing input and output operation code, you need to use the import statement to import the java.io package into the class where the application is located, so that you can use the classes and interfaces in java.io.

java Input statement

Use the Scanner class:

(1) Use the java.util package. ? import java.util.*

(2) Construct a Scanner class object, which is attached to the standard input stream System.in. ? Scanner?s =?new?Scanner(System.in);

(3) Commonly used next() method series: nextInt(): input integer, nextLine(): input string, nextDouble() :Input double precision number, next():Input string (use space as delimiter).

For example

import java.util.*;  
public class DEMO_1 {  
    public static void main(String[] args){  
        Scanner s = new Scanner(System.in);  
        System.out.print("输入你的姓名：");  
        String name = s.nextLine();  
        System.out.print("输入你的年龄：");  
        int age = s.nextInt();  
        System.out.println("姓名：" + name + "  年龄：" + age );  
        s.close();         //若没有关闭Scanner对象将会出现警告  
    }  
}

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