Why is it useful for a programmer to have some background in language design, even though he or she may never actually design a programming language?

He/She may need to read a program's code and need to know the language to know what he is doing to the program. just a guess

see explaination

Explanation:

import java.io.*;

import java.util.Scanner;

public class Winners {

public static void main(String args[]) throws IOException {

Scanner sc = new Scanner(new File("WorldSeriesWinners.txt"));

String commands[] = new String[100000];

int c = 0;

while (sc.hasNextLine()) {

String input = sc.nextLine();

System.out.println(input);

if (input.isEmpty())

continue;

commands[c++] = input;

}

sc.close();

Scanner keyboard = new Scanner(System.in);

System.out.println("Enter the name of a team: ");

String name = keyboard.nextLine();

int count = 0;

for (int i = 0; i < c; i++) {

if (commands[i] != null) {

if (commands[i].equals(name)) {

++count;

}

}

}

if(count!=0)

System.out.println(name + " has won the World Series in the time period from 1903 through 2018 " +count + " number of times" );

else

System.out.println("Team with name "+name+ " does not exists");

}

}