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;
	}
}