java 温习之字符串（统计字串…

package com.baidu.sep;

//统计字串在整个字符串中出现的次数

public class StringTest3 

{

public static void main(String [] args)

{

String whole ="abcnabcmabceswdbca abc dfr afc";

String son = "abc";

int ct = count1(whole, son);

System.out.println(ct);

int ct2 = count2(whole, son);

System.out.println(ct2);

}

// 这种方法是通过获得一次后截取字符串

public   static int count1(String whole,String son)

{

int index = 0;

int count = 0;

while((index=whole.indexOf(son))!=-1)

{

whole=whole.substring(index+son.length());

++count;

}

return count;

}

// 这种方法是通过移动检索的角标（个人建议用这种，尤其是大篇幅的统计出现次数时候）

public   static int count2(String whole,String son)

{

int index = 0;

int count = 0;

while((index=whole.indexOf(son,index))!=-1)

{

index = index + son.length();

++count;

}

return count;

}

}