Handling NullPointerException with Java Predicate

Let's take an example where the String we are working with is null.

package org.code2care.examples;

import java.util.function.Predicate;

public class PredicateAndExample {

    public static void main(String... args) {

        Predicate<String> startsWithU = text -> text.startsWith("U");
        String str = null;
        boolean result = startsWithU.test(str);
        System.out.println("String starts with U? " + result);

    }
}

As NullPointerException is a Runtime Exception, we can handle it using a null check and maybe a logic that works based on your use-case.

package org.code2care.examples;

import java.util.function.Predicate;

public class PredicateAndExample {

    public static void main(String... args) {
        Predicate<String> startsWithU = text -> text != null && text.startsWith("U");
        String str = null;

        if (str != null) {
            boolean result = startsWithU.test(str);
            System.out.println("String starts with U? " + result);
        } else {
            System.out.println("String is null!");
        }
    }
}