用java编写一个程序并取名test.c，统计该文件中出现"if" , "while","for"的次数。

非常感谢您的问题！以下是用Java编写的程序，可以统计test.c文件中出现"if"，"while"，"for"的次数：

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

public class Test {
    public static void main(String[] args) {
        String fileName = "test.c";
        int ifCount = 0;
        int whileCount = 0;
        int forCount = 0;

        try (BufferedReader br = new BufferedReader(new FileReader(fileName))) {
            String line;
            while ((line = br.readLine()) != null) {
                ifCount += countOccurrences(line, "if");
                whileCount += countOccurrences(line, "while");
                forCount += countOccurrences(line, "for");
            }
        } catch (IOException e) {
            e.printStackTrace();
        }

        System.out.println("if count: " + ifCount);
        System.out.println("while count: " + whileCount);
        System.out.println("for count: " + forCount);
    }

    private static int countOccurrences(String line, String word) {
        int count = 0;
        int index = 0;
        while ((index = line.indexOf(word, index)) != -1) {
            count++;
            index += word.length();
        }
        return count;
    }
}

希望这个程序能够帮到您！