Scanner类和Random类的使用

1.Scanner类的使用

import java.util.Scanner;

public class ScannerDemo {
public static void main(String[] args) {
     Scanner sc = new Scanner(System.in);
     //接收一个整型数据
     int i = sc.nextInt();
     System.out.println(i);
     //接收一个字符串
     String s = sc.next();
     System.out.println(s);
    }

2.Random类的使用

import java.util.Random;

public class ScannerDemo {
public static void main(String[] args) {

    Random ran = new Random();

     int i = ran.nextInt(50);
     System.out.println(i);

    double d = ran.nextDouble();
    System.out.println(d);
}