Java中Scanner用法简单示例

String s=sc.next();  //接受字符串数据
System.out.println(s);

int s1= sc.nextInt();//接受整型数据
System.out.println(s1);

double s2= sc.nextDouble();//接受小数数据
System.out.println(s2);

import java.util.Scanner;   //先导入Java.util.Scanner包
public class test {
    public static void main(String[] args) {
        //创建一个扫描器对象，用于接收键盘数据
        Scanner  sc=new Scanner(System.in);
        //从键盘接收数据
        String s=sc.next();  //接受字符串数据
        System.out.println(s);
    }
}

import java.util.Scanner;   //先导入Java.util.Scanner包
public class test {
    public static void main(String[] args) {
        //创建一个扫描器对象，用于接收键盘数据
        Scanner  sc=new Scanner(System.in);
        //从键盘接收数据
        String s= sc.nextLine();  //接受字符串数据
        System.out.println(s);
    }
}

import java.util.Random;
import java.util.Scanner;
 
public class ScannerDemo {
	public static void main(String[] args) {
		Random r = new Random();
		int num = r.nextInt(100);
		int input = -1;
		Scanner scanner = new Scanner(System.in);
		while(true) {
			System.out.println("猜一猜随机数是多少？");
			input=scanner.nextInt();
			if (input>num) {
				System.out.println("你输入的数字大了！");
			}else if(input<num) {
				System.out.println("你输入的数字小了！");
			}else if(input==num) {
				break;
			}else {
				System.out.println("您的输入有误！");
			}
		}
		System.out.println("恭喜你答对了！");
		scanner.close();
	}
}