Java从文件中读取数据和信息（读取文件中字符串整数和浮点数）

Java读取纯数字txt文件

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.util.Scanner;

public class Numbers {
   	
		public static void main(String[] args) throws FileNotFoundException  {
   		
			double sum=0;
//			InputStream list = new FileInputStream("./src/Numbers.txt");
			InputStream list = new FileInputStream("C:\\Users\\20193\\tutorial\\src\\Numbers.txt");
			
			Scanner scanner = new Scanner(list);
			
			while (scanner.hasNextDouble()) {
   
				double num = scanner