Java代码实现，输入一段代码，找出里面的关键字并分别计数

以下是Java代码实现，可以输入一段代码，找出里面的关键字并分别计数：

import java.util.HashMap;
import java.util.Scanner;

public class KeywordCounter {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入一段代码：");
        String code = scanner.nextLine();
        scanner.close();

        String[] keywords = {"abstract", "assert", "boolean", "break", "byte", "case", "catch", "char", "class", "const",
                "continue", "default", "do", "double", "else", "enum", "extends", "final", "finally", "float", "for",
                "if", "goto", "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"};

        HashMap<String, Integer> keywordCount = new HashMap<>();
        for (String keyword : keywords) {
            keywordCount.put(keyword, 0);
        }

        String[] words = code.split("\\W+");
        for (String word : words) {
            if (keywordCount.containsKey(word)) {
                keywordCount.put(word, keywordCount.get(word) + 1);
            }
        }

        System.out.println("关键字统计结果如下：");
        for (String keyword : keywordCount.keySet()) {
            int count = keywordCount.get(keyword);
            if (count > 0) {
                System.out.println(keyword + ": " + count);
            }
        }
    }
}

使用HashMap存储每个关键字出现的次数，然后遍历代码中的每个单词，如果是关键字则对应的计数器加1。最后输出统计结果。