java - 如果这个单词不在数组中，如何更新数组？

Question

我正在将 Java 文件转换为 XREF 文件。

这是我的问题:我想检查一个单词是否在数据库中，如果数据库中没有，则将其添加到数据库中。

这是我的代码(它是一个方法):

void add(String word, int lineNumber) {
    /* If not a Java reserved word, insert word into the database,
       indicating that it is referenced on line lineNumber */

    // all Java reserved words; word at end guarantees
    String[] javaReservedWord = {
        "abstract", "assert", "boolean", "break",
            "byte", "case", "catch", "char", "class", "const", "continue",
            "default", "do", "double", "else", "enum", "extends", "false",
            "final", "finally", "float", "for", "goto", "if", "implements",
            "import", "instanceof", "int", "interface", "long", "native",
            "new", "null", "package", "private", "protected", "public",
            "return", "short", "static", "strictfp", "super", "switch",
            "synchronized", "this", "throw", "throws", "transient", "true",
            "try", "void", "volatile", "while", word
    };

    int i; // termination of for loop

    // traverse javaReservedWord and see if any entry matches word
    for (i = 0; !word.equals(javaReservedWord[i]); i++);

    // matches a reserved word, so don't add to database
    if (i < javaReservedWord.length - 1) return;

    /* doesn't match a reserved word, so proceed by searching to see if
          word is already in database */   
  }

在这个方法中，Java文件被StringTokenizer分成了很多个单词，即String word，lineNumber就是这个所在的行>单词是。

Answer 1

您不能从定义为 void 的方法中返回任何内容，也不能返回两个内容。为此，您需要一个特殊的类(class)。

我会尝试这样的事情:

import java.util.Arrays;
import java.util.List;

public class Word {

    private List<String> javaReservedWord = Arrays.asList(
            "abstract", "assert", "boolean", "break",
            "byte", "case", "catch", "char", "class", "const", "continue",
            "default", "do", "double", "else", "enum", "extends", "false",
            "final", "finally", "float", "for", "goto", "if", "implements",
            "import", "instanceof", "int", "interface", "long", "native",
            "new", "null", "package", "private", "protected", "public",
            "return", "short", "static", "strictfp", "super", "switch",
            "synchronized", "this", "throw", "throws", "transient", "true",
            "try", "void", "volatile", "while"
    );

    class WordAndNumber {
        private String word;
        private int lineNumber;

        public WordAndNumber(String word, int lineNumber) {
            this.word = word;
            this.lineNumber = lineNumber;
        }

        public String getWord() {
            return word;
        }

        public int getLineNumber() {
            return lineNumber;
        }
    }

    private WordAndNumber add(String word, int lineNumber) {

        if (javaReservedWord.contains(word)) {
            return null;
        } else {
            // add in DB

            return new WordAndNumber(word, lineNumber);
        }
    }
}