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CountKeywords.java
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executable file
·58 lines (56 loc) · 2.16 KB
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/* */ package exercise;
/* */
/* */ import java.io.File;
/* */ import java.util.Arrays;
/* */ import java.util.HashSet;
/* */ import java.util.Scanner;
/* */ import java.util.Set;
/* */
/* */ public class CountKeywords {
/* */ public static void main(String[] args) throws Exception {
/* 11 */ Scanner input = new Scanner(System.in);
/* 12 */ System.out.println("Enter a Java source file: ");
/* 13 */ String filename = input.nextLine();
/* 14 */ File file = new File(filename);
/* 15 */ if (file.exists()) {
/* 16 */ System.out.println("The number of keywords in " + filename + " is " +
/* 17 */ countKeywords(file));
/* */ } else {
/* */
/* 20 */ System.out.println("File " + filename + " does not exist");
/* */ }
/* */ }
/* */
/* */ public static int countKeywords(File file) throws Exception {
/* 25 */ String[] keywordString = { "abstract", "assert", "boolean", "break", "byte", "case", "catch", "char", "class", "const", "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" };
/* */
/* */
/* */
/* */
/* */
/* */
/* */
/* */
/* */
/* */
/* */
/* */
/* 38 */ Set<String> keywordSet = new HashSet<>(Arrays.asList(keywordString));
/* */
/* 40 */ int count = 0;
/* 41 */ Scanner input = new Scanner(file);
/* 42 */ while (input.hasNext()) {
/* 43 */ String word = input.next();
/* 44 */ if (keywordSet.contains(word)) {
/* 45 */ count++;
/* 46 */ System.out.print(word + " ");
/* */ }
/* */ }
/* 49 */ System.out.println();
/* 50 */ return count;
/* */ }
/* */ }
/* Location: /Volumes/TXS.128G/hope useful/practice/2020.jar!/exercise/CountKeywords.class
* Java compiler version: 8 (52.0)
* JD-Core Version: 1.1.3
*/