用户交互Scanner

package scanner;

import java.util.Scanner;

public class Demo01 {
public static void main(String[] args) {
//从硬盘接收数据
Scanner scanner = new Scanner(System.in);
System.out.println("使用next方式接收：");
//判断是否还有输入
if (scanner.hasNext()){
String str = scanner.next();
System.out.println("输入的内容为"+str);

    }
    scanner.close();

}

}
//========================================================================================
package scanner;

import java.util.Scanner;

public class Demo02 {
public static void main(String[] args) {
//从硬盘接收数据
Scanner scanner = new Scanner(System.in);
System.out.println("使用nextLine方式接收：");
//判断是否还有输入
if (scanner.hasNextLine()){
String str = scanner.nextLine();
System.out.println("输入的内容为"+str);

    }
    scanner.close();

}

}
//=======================================================================================
package scanner;

import java.util.Scanner;

public class Demo04 {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.println("请输入角色名");
String name=scanner.nextLine();
System.out.println("您的角色名是："+name);
scanner.close();
}
}