Please Java Helpcomplete The Code To Counts The Number Of Lines Input
Please Java Helpcomplete the Code To Counts The Number Of Lines Input by a user until the user enters the string ENDOFDATA (must be uppercase letters, no spaces) on a line by itself. Make sure you display the number of lines found. Use the nextLine() method of Scanner class to read entire lines of data. (Hint, this is like counting the number of integers entered, but reading Strings and using String comparison to check for equality). String SENTINEL = "ENDOFDATA"; Scanner keyboard = new Scanner(System.in); System.out.println( "Enter lines of data or " + SENTINEL + " to quit" );
Paper For Above instruction
The task involves creating a Java program that reads lines of input from the user until a specific sentinel value, "ENDOFDATA", is entered, and counts the total number of lines entered before this sentinel. This problem is a common introduction to stream-based input handling in Java, demonstrating the use of the Scanner class, string comparison, and control flow constructs.
To accomplish this, the program will declare and initialize a String constant SENTINEL with the value "ENDOFDATA"
. It will then instantiate a Scanner object named keyboard to read input from System.in
. The program prompts the user to enter data, specifying that entering ENDOFDATA will terminate input collection. The core logic involves a loop that repeatedly reads an entire line using the nextLine() method. Each line is checked for equality with the sentinel value. If the line matches ENDOFDATA
, the loop terminates; otherwise, it increments a counter tracking the number of valid data lines entered so far.
This approach mimics counting integers entered, but instead handles strings with exact comparison, emphasizing string handling and control flow in Java. import java.util.Scanner; public class LineCounter { public static void main(String[] args) { final String SENTINEL = "ENDOFDATA";
Scanner keyboard = new Scanner(System.in); int lineCount = 0;
System.out.println("Enter lines of data or " + SENTINEL + " to quit"); while (true) { String inputLine = keyboard.nextLine(); if (inputLine.equals(SENTINEL)) { break;
} else { lineCount++; } }
System.out.println("Number of lines entered: " + lineCount); keyboard.close(); } }
This program efficiently waits for user input, compares each line to the sentinel string, and counts all valid entries. When the sentinel is entered, the program terminates the loop and displays the total number of lines entered before the sentinel. Proper resource management is ensured by closing the Scanner object at the end.
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