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：

[java] view plain copy
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;
}
}