读取

import java.util.Scanner;

public class index{

    public static void main(String[] args){

        Scanner in = new Scanner(System.in);

        System.out.println("What's your name?");

        String name = in.nextLine();

        Scanner inage = new Scanner(System.in);

        System.out.println("What is your age?");

        int age = inage.nextInt();

        System.out.println("name:" + name);

        System.out.println("age:" + age);

    }

}

大数值：BigInteger

举个例子：

public class index{

    public static void main(String[] args){

        Scanner in = new Scanner(System.in);

  

        System.out.println("How many numbers do you need to draw?");

        int k = in.nextInt();

  

        System.out.println("What is the highest you can draw?");

        int n = in.nextInt();

        BigInteger lotteryOdds = BigInteger.valueOf(1);

        System.out.println(lotteryOdds);

        int a = 1;

        for(int i = 1; i < k; i++){

            lotteryOdds = lotteryOdds.multiply(BigInteger.valueOf(n - i + 1)).divide(BigInteger.valueOf(i));

            System.out.println("n - i + 1 :" + (n - i + 1));

            System.out.println("i: " + i);

            System.out.println("divide: " + ((n - i + 1)/i));

            a = a * ((n - i + 1)/i);

            System.out.println("Big : " + (BigInteger.valueOf(n - i + 1)).divide(BigInteger.valueOf(i)));

            System.out.println("a: " + a);

            System.out.println("lotteryOdds : " + lotteryOdds);

            System.out.println("++++++++++++++++++++++==+++++");

        }

        System.out.println("Your odds are 1 in " + lotteryOdds + ".Good luck!");

        System.out.println("a :" + a);

    }

}