Java中的 Matcher hitEnd() 方法及示例

Matcher 类的hitEnd()方法用于检查此匹配器上的模式匹配是否已停止。当在匹配器中找不到更多匹配的组时，匹配结束。此方法返回一个布尔值，说明相同。

句法：

public boolean hitEnd()

参数：此方法不带参数。

返回值：此方法返回一个布尔值，说明此匹配器是否已完成匹配。

下面的示例说明了 Matcher.hitEnd() 方法：

示例 1：

// Java code to illustrate hitEnd() method
  
import java.util.regex.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // Get the regex to be checked
        String regex = "(Geeks)";
  
        // Create a pattern from regex
        Pattern pattern
            = Pattern.compile(regex);
  
        // Get the String to be matched
        String stringToBeMatched
            = "GeeksForGeeks Geeks for For Geeks Geek";
  
        // Create a matcher for the input String
        Matcher matcher
            = pattern.matcher(stringToBeMatched);
  
        while (matcher.find()) {
  
            System.out.println("Group matched: "
                               + matcher.group());
  
            // Check if the matching has ended
            // using hitEnd() method
            System.out.println("Has matching hit end: "
                               + matcher.hitEnd());
        }
  
        // Check if the matching has ended
        // using hitEnd() method
        System.out.println("Has matching hit end: "
                           + matcher.hitEnd());
    }
}

输出：

Group matched: Geeks
Has matching hit end: false
Group matched: Geeks
Has matching hit end: false
Group matched: Geeks
Has matching hit end: false
Group matched: Geeks
Has matching hit end: false
Has matching hit end: true

示例 2：

// Java code to illustrate hitEnd() method
  
import java.util.regex.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // Get the regex to be checked
        String regex = "(GFG)";
  
        // Create a pattern from regex
        Pattern pattern
            = Pattern.compile(regex);
  
        // Get the String to be matched
        String stringToBeMatched
            = "GFGFGFGFGFGFGFGFGFG FGF GFG GFG FGF";
  
        // Create a matcher for the input String
        Matcher matcher
            = pattern.matcher(stringToBeMatched);
  
        while (matcher.find()) {
  
            System.out.println("Group matched: "
                               + matcher.group());
  
            // Check if the matching has ended
            // using hitEnd() method
            System.out.println("Has matching hit end: "
                               + matcher.hitEnd());
        }
  
        // Check if the matching has ended
        // using hitEnd() method
        System.out.println("Has matching hit end: "
                           + matcher.hitEnd());
    }
}

输出：

Group matched: GFG
Has matching hit end: false
Group matched: GFG
Has matching hit end: false
Group matched: GFG
Has matching hit end: false
Group matched: GFG
Has matching hit end: false
Group matched: GFG
Has matching hit end: false
Group matched: GFG
Has matching hit end: false
Group matched: GFG
Has matching hit end: false
Has matching hit end: true

参考： https://docs.oracle.com/javase/9/docs/api/ Java/util/regex/Matcher.html#hitEnd–