获取一个字符串在另一个字符串中出现的次数。
public static void main(String[] args) {int count = 0 ;int site ;String s1 ="kpkpeekpkpeekp";String s2 = "kp" ;while ( ( site = s1.indexOf(s2) ) !=-1 ) {s1 = s1.substring(site+s2.length()) ; count ++ ;}System.out.println("出现"+count+"次");String s = "ppdd dd ww ddsbddwsd dd";int counts=0; int t = 0;while(s.indexOf("dd",t)!=-1) {t=s.indexOf("dd",t)+1;counts++;}System.out.println(counts);}
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