abhirockzz

import java.util.Collections;
import java.util.List;
import java.util.Objects;
import java.util.function.Predicate;

public class RandomGist {

    public static <T> T requireNonEmpty(T object, Predicate<T> predicate, String msgToCaller){
        Objects.requireNonNull(object);
        Objects.requireNonNull(predicate);

abhirockzz

package com.abhirockzz.wordpress.ejb.lifecycle.singleton;
 
import com.abhirockzz.wordpress.ejb.lifecycle.stateful.MyStatefulBean;
import java.util.Date;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.ejb.Singleton;
import javax.ejb.Startup;
 
@Singleton

abhirockzz

import java.util.Date;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.ejb.ConcurrencyManagement;
import javax.ejb.ConcurrencyManagementType;
import javax.ejb.Lock;
import javax.ejb.LockType;
import javax.ejb.Singleton;
import javax.ejb.Startup;
 

abhirockzz

public static Optional<String> stringOptional(String input) {
    return Optional.of(input);
}

abhirockzz

public static Optional<String> stringNullableOptional(String input) {
	if (!new Random().nextBoolean()) {
		input = null;
	}
		
	return Optional.ofNullable(input);
}

abhirockzz

public static Optional<String> emptyOptional() {
	return Optional.empty();
}

abhirockzz

public static void consumingOptional() {
	Optional<String> wrapped = Optional.of("aString");
	if (wrapped.isPresent()) {
		System.out.println("Got string - " + wrapped.get());
	}
	else {
		System.out.println("Gotcha !");
	}
}

abhirockzz

public static void consumingNullableOptional() {
	String input = null;
	if (new Random().nextBoolean()) {
		input = "iCanBeNull";
	}
	Optional<String> wrapped = Optional.ofNullable(input);
	System.out.println(wrapped.orElse("default"));
}

abhirockzz

public static void consumingEmptyOptional() {
	String input = null;
	if (new Random().nextBoolean()) {
		input = "iCanBeNull";
	}
	Optional<String> wrapped = Optional.ofNullable(input);
	System.out.println(wrapped.orElseGet(
		() -> {
			return "defaultBySupplier";
		}

abhirockzz

package com.abhirockzz.wordpress.npesaviors;

import java.util.Map;
import java.util.Objects;

public class UsingObjects {

	String getVal(Map<String, String> aMap, String key) {
		return aMap.containsKey(key) ? aMap.get(key) : null;
	}