計算字串中子字串或字元的出現次數
來自 org.apache.commons.lang3.StringUtils 的 countMatches
方法通常用於計算 String
中子字串或字元的出現次數:
import org.apache.commons.lang3.StringUtils;
String text = "One fish, two fish, red fish, blue fish";
// count occurrences of a substring
String stringTarget = "fish";
int stringOccurrences = StringUtils.countMatches(text, stringTarget); // 4
// count occurrences of a char
char charTarget = ',';
int charOccurrences = StringUtils.countMatches(text, charTarget); // 3
否則,對於標準 Java API,你可以使用正規表示式:
import java.util.regex.Matcher;
import java.util.regex.Pattern;
String text = "One fish, two fish, red fish, blue fish";
System.out.println(countStringInString("fish", text)); // prints 4
System.out.println(countStringInString(",", text)); // prints 3
public static int countStringInString(String search, String text) {
Pattern pattern = Pattern.compile(search);
Matcher matcher = pattern.matcher(text);
int stringOccurrences = 0;
while (matcher.find()) {
stringOccurrences++;
}
return stringOccurrences;
}