Java 中的模式描述()方法,示例

原文:https://www . geesforgeks . org/pattern-asprediate-method-in-Java-with-examples/

用于创建可用于匹配字符串的谓词对象的模式类的 asPredicate() 方法。谓词是一个函数接口,因此可以用作 lambda 表达式或方法引用的赋值目标。

语法:

public Predicate asPredicate()

参数:此方法不接受任何内容作为参数。

返回值:这个方法返回一个谓词,可以用来匹配字符串。

下面的程序说明了 toString()方法:

程序 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

程序二:

// 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 # asprediate()