用java编设有10个单词的数组，查找有or子串的单词数，和单词长度为3的单词数

public class StringPro {

public static void main(String args[])
{
String[] demo={"qingwa","for","torer","duck","forg","lion","bill","hvoer","hover","xml"};
//下面查找含有or的字串
for(int i=0;i<demo.length;i++)
{
if(demo[i].indexOf("or")!=-1)
{
System.out.print(demo[i]+" ");
}
}
System.out.println();
//下面查询长度为3的字串
for(int i=0;i<demo.length;i++)
{
if(demo[i].length()==3)
{
System.out.print(demo[i]+" ");
}
}
System.out.println();
}
}