Java Pattern asPredicate()用法及代码示例

Pattern类的asPredicate()方法用于创建可用于匹配字符串的谓词对象。谓词是函数接口，因此可用作lambda表达式或方法引用的分配目标。

用法:

public Predicate asPredicate()

参数：此方法不接受任何参数。

返回值：此方法返回可用于匹配字符串的谓词。

以下示例程序旨在说明toString()方法：

示例1:

// Java program to demonstrate 
// Pattern.splitAsStream(CharSequence input) method 
  
import java.util.regex.*; 
import java.util.function.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
        // create a REGEX String 
        String REGEX = "ee"; 
  
        // create the string 
        // in which you want to search 
        String actualString 
            = "aaeebbeecceeddee"; 
  
        // create a Pattern using REGEX 
        Pattern pattern 
            = Pattern.compile(REGEX); 
  
        // get Predicate Object 
        Predicate<String> predicate 
            = pattern.asPredicate(); 
  
        // check whether predicate match 
        // with actualString 
        boolean value = predicate 
                            .test(actualString); 
  
        // print result 
        System.out.println("value matched: "
                           + value); 
    } 
}

输出：

value matched: true

示例2:

// Java program to demonstrate 
// Pattern.splitAsStream(CharSequence input) method 
  
import java.util.regex.*; 
import java.util.function.*; 
public class GFG { 
    public static void main(String[] args) 
    { 
        // create a REGEX String 
        String REGEX = "org"; 
  
        // create the string 
        // in which you want to search 
        String actualString 
            = "welcome geeks"; 
  
        // create a Pattern using REGEX 
        Pattern pattern 
            = Pattern.compile(REGEX); 
  
        // get Predicate Object 
        Predicate<String> predicate 
            = pattern.asPredicate(); 
  
        // check whether predicate match 
        // with actualString 
        boolean value 
            = predicate.test(actualString); 
  
        // print result 
        System.out.println("value matched: "
                           + value); 
    } 
}

输出：

value matched: false

参考： https://docs.oracle.com/javase/10/docs/api/java/util/regex/Pattern.html#asPredicate()

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注：本文由纯净天空筛选整理自AmanSingh2210大神的英文原创作品 Pattern asPredicate() Method in Java with Examples。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。