Java Pattern asPredicate() Method

The asPredicate() method of Java Pattern class is used to create a predicate which can be used to match a string. This method is introduced in JDK 1.8.

Syntax:

Returns

This method returns the predicate which can be used for matching on a string

Example 1

import java.util.*;
import java.util.regex.Pattern;

public class PatternasPredicateExample1 {
	public static void main(String args[]){
	List<String> progLangs = Arrays.asList("ram123@gmail.com",
													 							"javatpoint@gmail.com",
													 							"abc342@gmailcom",
											 									"seeta342@gm12ail.com",
											 									"xy.z111@gmail.com");
Pattern p = Pattern.compile("^(.+)@gmail.com");
progLangs.stream().filter(p.asPredicate()).forEach(System.out::println);
	}
}

Test it Now

Output:

[email protected]
[email protected]
[email protected]

Example 2

import java.util.Scanner;
import java.util.regex.Pattern;

public class PatternasPredicateExample2{
public static void main(String arg[])
{
	Pattern p = Pattern.compile(" *ab");
	//calling asPredicate method
	  System.out.println(p.asPredicate().test("abc")); //true
	  Scanner s = new Scanner("ab");
	  System.out.println(s.hasNext("\\ab")); //false
}
}

Test it Now

Output:

true
false

Example 3

import java.util.Scanner;
import java.util.regex.Pattern;

public class PatternasPredicateExample3{
public static void main(String arg[])
{
	int c=0;
	Pattern p = Pattern.compile(" *ab");
	//calling asPredicate method
	  System.out.println(p.asPredicate().test("abc")); //true
	  System.out.println("asPredicate Hash code "+p.asPredicate().hashCode());
	  System.out.println("Pattern Hash code "+p.hashCode());
}
}

Test it Now

Output:

true
asPredicate Hash code 8039463
Pattern Hash code 3849352

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Java Pattern Class

Java Pattern asPredicate() Method

Syntax:

Returns

Example 1

Example 2

Example 3

Feedback

Help Others, Please Share

Learn Latest Tutorials

Preparation

Trending Technologies

B.Tech / MCA