java - 错误: Cannot find symbol showing up Java Beginner

Question

我正在尝试创建一个程序，从文件中选择一个随机单词，并根据单词的长度输出正确的空格数。例如，如果单词是 smart，则程序输出 _ _ _ _ _。这是程序:

    import java.util.*;
    import java.io.*;
    public class Selection {
        public static void main(String[] args) throws IOException {
        String[] words = new String[100];
        Scanner in = new Scanner(new FileReader("words.txt"));
        for (int i = 0; i < 100; i++)
                words[i] = in.next();
        Random r = new Random();
        int selected = r.nextInt[100];
        String sWord = words[selected];

        for (int j = 0; j < sWord.length(); j++)
                System.out.printf("_");

        in.close();
}
}

这是错误:

    java:18: error: cannot find symbol
    int selected = r.nextInt[100];
                    ^
    symbol:   variable nextInt
    location: variable r of type Random
    1 error

任何帮助理解我没有做正确的事情的帮助将不胜感激。

Answer 1

 int selected = r.nextInt[100];// use () r.nextInt(num);