Basic usage of scanner

**

Be careful Next and NextLine The difference between

**- Next See the space symbol end

• NextLine See the end of the carriage return symbol **

**Next Usage code example for

package base;

import java.util.Scanner;
public class Demo05 {
    
    public static void main(String[] args) {
    

        Scanner scanner = new Scanner(System.in);
        // Create a scan object to receive keyboard data 
        System.out.println(" Use next Method acceptance  ：");

        // Judge whether the user has entered characters 
        if(scanner.hasNext()){
    
            String str =  scanner.next();
            System.out.println(" The input content is  ："+str);
            
        }
        scanner.close();
    }
}

D:\apps\jdk8\bin\java.exe "-javaagent:E:\javanote\IntelliJ IDEA Community Edition 2021.1\lib\idea_rt.jar=52726:E:\javanote\IntelliJ IDEA Community Edition 2021.1\bin" -Dfile.encoding=UTF-8 -classpath D:\apps\jdk8\jre\lib\charsets.jar;D:\apps\jdk8\jre\lib\deploy.jar;D:\apps\jdk8\jre\lib\ext\access-bridge-64.jar;D:\apps\jdk8\jre\lib\ext\cldrdata.jar;D:\apps\jdk8\jre\lib\ext\dnsns.jar;D:\apps\jdk8\jre\lib\ext\jaccess.jar;D:\apps\jdk8\jre\lib\ext\jfxrt.jar;D:\apps\jdk8\jre\lib\ext\localedata.jar;D:\apps\jdk8\jre\lib\ext\nashorn.jar;D:\apps\jdk8\jre\lib\ext\sunec.jar;D:\apps\jdk8\jre\lib\ext\sunjce_provider.jar;D:\apps\jdk8\jre\lib\ext\sunmscapi.jar;D:\apps\jdk8\jre\lib\ext\sunpkcs11.jar;D:\apps\jdk8\jre\lib\ext\zipfs.jar;D:\apps\jdk8\jre\lib\javaws.jar;D:\apps\jdk8\jre\lib\jce.jar;D:\apps\jdk8\jre\lib\jfr.jar;D:\apps\jdk8\jre\lib\jfxswt.jar;D:\apps\jdk8\jre\lib\jsse.jar;D:\apps\jdk8\jre\lib\management-agent.jar;D:\apps\jdk8\jre\lib\plugin.jar;D:\apps\jdk8\jre\lib\resources.jar;D:\apps\jdk8\jre\lib\rt.jar;E:\javanote\out\production\Hello base.Demo05
 Use next Method acceptance  ：
hello world
 The input content is  ：hello

Process finished with exit code 0

Note the space in the middle above

**

NextLine Use

**

package base;
import java.util.Scanner;
public class Demo06 {
    
    public static void main(String[] args) {
    


        Scanner scanner= new Scanner(System.in);

        System.out.println(" Use nextline Method ");

        if (scanner.hasNextLine()){
    
           String  str = scanner.nextLine();
            System.out.println(" The input is  ："+str);

        }

        scanner.close();

    }
}

D:\apps\jdk8\bin\java.exe "-javaagent:E:\javanote\IntelliJ IDEA Community Edition 2021.1\lib\idea_rt.jar=52700:E:\javanote\IntelliJ IDEA Community Edition 2021.1\bin" -Dfile.encoding=UTF-8 -classpath D:\apps\jdk8\jre\lib\charsets.jar;D:\apps\jdk8\jre\lib\deploy.jar;D:\apps\jdk8\jre\lib\ext\access-bridge-64.jar;D:\apps\jdk8\jre\lib\ext\cldrdata.jar;D:\apps\jdk8\jre\lib\ext\dnsns.jar;D:\apps\jdk8\jre\lib\ext\jaccess.jar;D:\apps\jdk8\jre\lib\ext\jfxrt.jar;D:\apps\jdk8\jre\lib\ext\localedata.jar;D:\apps\jdk8\jre\lib\ext\nashorn.jar;D:\apps\jdk8\jre\lib\ext\sunec.jar;D:\apps\jdk8\jre\lib\ext\sunjce_provider.jar;D:\apps\jdk8\jre\lib\ext\sunmscapi.jar;D:\apps\jdk8\jre\lib\ext\sunpkcs11.jar;D:\apps\jdk8\jre\lib\ext\zipfs.jar;D:\apps\jdk8\jre\lib\javaws.jar;D:\apps\jdk8\jre\lib\jce.jar;D:\apps\jdk8\jre\lib\jfr.jar;D:\apps\jdk8\jre\lib\jfxswt.jar;D:\apps\jdk8\jre\lib\jsse.jar;D:\apps\jdk8\jre\lib\management-agent.jar;D:\apps\jdk8\jre\lib\plugin.jar;D:\apps\jdk8\jre\lib\resources.jar;D:\apps\jdk8\jre\lib\rt.jar;E:\javanote\out\production\Hello base.Demo06
 Use nextline Method 
hello world
 The input is  ：hello world

Process finished with exit code 0