public int countChars(String toSearch,Char c){
short count=0;
for(int i=0;i<toSearch.length();i++)
if (c==toSearch.charAt(i) count++;
return count;
}public int countChars(String toSearch,Char c){
int count=0,i=0;
while((i=toSearch.indexOf(c,i))!=-1)
count++;
return count;
}个人觉得相对而言,用for的效率要高一些
short count=0;
for(int i=0;i<toSearch.length();i++)
if (c==toSearch.charAt(i) count++;
return count;
}public int countChars(String toSearch,Char c){
int count=0,i=0;
while((i=toSearch.indexOf(c,i))!=-1)
count++;
return count;
}个人觉得相对而言,用for的效率要高一些
if (c==toSearch.charAt(i) count++;
少了个括号,应该为
if (c==toSearch.charAt(i))count++;使用while的应该这么写才对
public int countChars(String toSearch,Char c){
int count=0,i=-1;
while((i=toSearch.indexOf(c,i+1))!=-1)
count++;
return count;
}
int len = str.length();
int count = 0;
for (int i=0;i<len;i++){
if str.charAt(i) == '~' count++;
}