java小练习--获取abc字符串在整个字符串中出现的次数

在下面一行字符串中获取abc字符串在整个字符串中出现的次数。
"wabcerabctyabcuiabcabcqq"

思路：使用indexOf和substring();

源码如下：

public static void main(String[] args) 

	{

		String s1 = "abcwabcerabctyabcuiabcabc";

		String s2 = "abc";

		int count = getCount(s1,s2);

		int count2 = getCount2(s1,s2);

		System.out.println("count = "+count);

		System.out.println("count2 = "+count2);



	}



	/*第一种方法

	获取abc字符串在整个字符串中出现的次数。

	"wabcerabctyabcuiabcabcqq"

	*/

	public static int getCount(String str,String sub)

	{

		int index = 0;

		int count = 0;

		while((index = str.indexOf(sub,index))!=-1)

		{

	

			index = index + sub.length();

			count++;

		}

		return count;

	}

          /*第二种方法*/

	public static int getCount2(String str,String sub)

	{

		int index = 0;

		int count = 0;



		while((index=str.indexOf(sub))!=-1)

		{

			str = str.substring(index+sub.length());

			count++;

		}

		return count;

	}

}