代码如下:
public static void main(String[] args) {
//String s = RandomNum.getRandomNumStr(5);
//System.out.println(s);
System.out.println("生成5个含有5个字符的字符串：");
RandomNum.SuiJiZiFuChuan(5,5);
System.out.println("生成3个含有6个字符的字符串：");
RandomNum.SuiJiZiFuChuan(6,3);
System.out.println("生成任意1到20个含有任意1到10个字符的字符串：");
RandomNum.SuiJiZiFuChuan((int)(20*Math.random()),(int)(10*Math.random()));
System.out.println("随机性生成字符：");
int i=0;
while(i