commons-text 生成指定长度的随机字符串

package com.skylink.junge.demo;

import java.util.HashSet;
import java.util.Set;

import org.apache.commons.text.RandomStringGenerator;
import org.apache.commons.text.StrTokenizer;

public class StrTokenizerTest {

    public static void main(String[] args) {
        StrTokenizer strTokenizer = new StrTokenizer("a,b,c", ‘,‘);
        while (strTokenizer.hasNext()) {
            System.out.println(strTokenizer.next());
        }
        
        strTokenizer = new StrTokenizer("a\nb\nc");
        while (strTokenizer.hasNext()) {
            System.out.println(strTokenizer.next());
        }
        
        StrTokenizer tsvTokenizer = StrTokenizer.getCSVInstance(" a, b , c ");
        while (tsvTokenizer.hasNext()) {
            System.out.println(tsvTokenizer.next());
        }
        
        int count = 10000;
        Set<String> result = new HashSet<String>(count);
        RandomStringGenerator generator = new RandomStringGenerator.Builder().withinRange(‘0‘, ‘9‘).build();
        for (int i=0; i<count; i++) {
            result.add(generator.generate(20));
        }
        
        if (count != result.size()) {
            System.out.println("repeat str");
        }
        System.out.println(result.size());
    }

}