Java字符串中找单词出现个数？

[qusthuanglong]

统计这篇短文用了多少个单词“to”。
There was an American couple who had no children, so they wanted to adopt a child. Finally, an orphanage contacted them, saying, "We have a baby for adoption.It's a Russian orphan." The couple was delighted and went to bring the baby home.
On the way home, they stopped by a university to enroll in a Russian course. "Why do you want to learn Russian? The English that we speak is a very good language," the university secretary asked."Well, we just adopted a Russian baby. When he begins to speak Russian in a few years, we are afraid that we might not be able to understand him," the couple replied.



考虑的情况: 句子首字母是to,一个单词里有to,比如too;

[paullbm]

用正则匹配就OK了！

[东子于]

同意楼上的

[hujixianghujixiang]

同意楼上的

[zhuwen9]

		String str = "TO,to,toto,aaaaa,too,ato";
			int times = str.length() - str.replaceAll("[To||to]","").length();
			System.out.print("to出现的次数"+times/2);

[sxg263]

import java.io.*;
public class CountChar {

	/**
	 * @param args
	 * @throws IOException 
	 */
	public static void main(String[] args) throws IOException {
		FileReader fileIn=null;
		try{
			fileIn=new FileReader("D:\\java\\1.txt");
		}catch(FileNotFoundException e){
			System.out.println("找不到文件,程序将终止！");
			e.printStackTrace();
			System.exit(-1);
		}
		char[] cc=new char[1024];
		
		try{
			fileIn.read(cc);
		}catch(IOException e){
			System.out.println("文件读入错误！");
			fileIn.close();
		}
		String str1=new String(cc);
		String[] strArray=new String[1024];
		strArray=str1.split(" to ");
		int count=strArray.length;
		System.out.println(""+count);
		
	}

}

没考虑开头结尾，和to为一句话的结尾情况（如 to, to?）
太困了，睡了。

[chan10]

还是用正则表达式吧。
简单易懂。