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;	}}