Java Scanner如何获取字符串和带空格的字符串

 public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        System.out.print("地址：");
        String host = s.next();
        System.out.println("host = " + host);
        System.out.print("端口：");
        String port = s.next();
        System.out.println("port = " + port);
        System.out.print("用户名：");
        String user = s.next();
        System.out.println("user = " + user);
        System.out.print("带空格的用户名：");
        String userSpace = s.next();
        System.out.println("userSpace = " + userSpace);
    }

  public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        System.out.print("地址：");
        String host = s.nextLine();
        System.out.println("host = " + host);
        System.out.print("端口：");
        String port = s.nextLine();
        System.out.println("port = " + port);
        System.out.print("用户名：");
        String user = s.nextLine();
        System.out.println("user = " + user);
        System.out.print("带空格的用户名：");
        String userSpace = s.nextLine();
        System.out.println("userSpace = " + userSpace);
    }

import java.util.Scanner;
public class Demo1 {
    public static void main(String[] args) {
        //创建一个Scanner类的对象，准备从键盘接收数据
        Scanner scanner = new Scanner(System.in);
        System.out.println("使用next方式接收：");
        if (scanner.hasNext()) {
            //scanner.hasNext()  判断用户是否还有输入
            String str=scanner.next(); //如果还有输入，通过scanner.next()接收用户的输入
            String str=scanner.next();
            System.out.println("输出内容："+str);
        }
        scanner.close();//属于I/O流的类，使用结束后及时关闭，否则将一直占用资源
    }
}

import java.util.Scanner;
public class Demo2 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("使用nextLine方式接收：");
        if (scanner.hasNextLine()){
            String str = scanner.nextLine();
            System.out.println("输出内容："+str);
        }
        scanner.close();
    }
}

import java.util.Scanner;
public class Demo3 {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String str=scanner.nextLine();
        //接收用户输入，直至敲下回车结束，将输入保存为字符串
        System.out.println("输出的内容："+str);
        scanner.close();
    }
}