Kajian Kes: Mengira Kata Kunci

package demo; import java.util.*; import java.io.*; public class CountKeywords { public static void main(String[] args) { Scanner input = new Scanner(System.in); System.out.print("Enter a Java source file: "); String filename = input.nextLine(); File file = new File(filename); if(file.exists()) { try { System.out.println("The number of keywords in " + filename + " is " + countKeywords(file)); } catch (Exception e) { System.out.println("An error occurred while counting keywords: " + e.getMessage()); } } else { System.out.println("File " + filename + " does not exist"); } } public static int countKeywords(File file) throws Exception { // Array of all Java keywords + true, false and null String[] keywordString = {"abstract", "assert", "boolean", "break", "byte", "case", "catch", "char", "class", "const", "continue", "default", "do", "double", "else", "enum", "extends", "for", "final", "finally", "float", "goto", "if", "implements", "import", "instanceof", "int", "interface", "long", "native", "new", "package", "private", "protected", "public", "return", "short", "static", "strictfp", "super", "switch", "synchronized", "this", "throw", "throws", "transient", "try", "void", "volatile", "while", "true", "false", "null"}; Set keywordSet = new HashSet<>(Arrays.asList(keywordString)); int count = 0; Scanner input = new Scanner(file); while(input.hasNext()) { String word = input.next(); if(keywordSet.contains(word)) count++; } return count; } }