How to get keyboard input data in java-JavaBase-php.cn

How to get keyboard input data in java

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Release： 2019-11-20 09:45:23

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How to get keyboard input data in java

Java provides a Scanner class. Using this class, we can easily obtain keyboard input parameters.

Scanner is a text scanner based on regular expressions. Values of basic types and string types can be parsed from files, input streams, and strings. The Scanner class provides multiple constructors. Different constructors can accept files, input streams, and strings as data sources and are used to parse data from files and input stream strings.

Example:

import java.util.Scanner;

/**
 * Scanner的简单示例
 * */
public class TestScanner {
    
    public static void main(String[] args) {
        
        //创建Scanner对象
        //System.in表示标准化输出，也就是键盘输出
        Scanner sc = new Scanner(System.in);
        //利用hasNextXXX()判断是否还有下一输入项
        while (sc.hasNext()) {
            //利用nextXXX()方法输出内容
            String str = sc.next();
            System.out.println(str);
        }
    }
}

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The result is: after you enter something in the console and click Enter, the same content will be output below. If you click Return when entering If you press the Enter or Tab key, the output content will wrap at that location.

You can use Scanner to enter parameters when the java program requires parameters

Code example: TestScannerIn.java

import java.util.Scanner;

/**
 * 使用Scanner在程序需要的时候输入参数
 * */
public class TestScannerIn {
    
    public static void main(String[] args) {
        
        /**
         * 写一个输出个人信息的小例子
         * */
        Scanner sc = new Scanner(System.in);
        sc.useDelimiter("/n");
        System.out.println("欢迎来到冲出地球的博客，我是冲出地球^_^");
        System.out.println("请问你叫什么名字呢？");
        String name = sc.nextLine();
        System.out.println("请问你来自哪里呢？");
        String area = sc.nextLine();
        System.out.println("好的，你来自" + area + ",那么，你们那有什么美食吗？");
        String food = sc.nextLine();
        System.out.println("好的，那么我来复述一下你的信息：");
        System.out.println("你叫" + name + ",来自于：" + area);
        System.out.println("你们那最好吃的东西是：" + food);
        System.out.println("对吧~~");
    }
}

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For more java knowledge, please pay attention tojava basic tutorial.

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