Pattern asPredicate() Method in Java with Examples

asPredicate() method of a Pattern class used to creates a predicate object which can be used to match a string.Predicate is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

Syntax:

public Predicate asPredicate()

Parameters: This method accepts nothing as parameter.

Return value: This method returns a predicate which can be used for matching on a string.

Below programs illustrate the toString() method:

Program 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); 
    } 
} 

Output:

value matched: true

Program 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); 
    } 
} 

Output:

value matched: false

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

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