I am new to Java and for the time created an array of objects in Java. I have a class A for example - A[] arr = new A[4]; But this is only creating pointers (references) to A and not 4 objects....

Aug 11, 2017 · I have noted that many Java 8 methods in Oracle JDK use Objects.requireNonNull(), which internally throws NullPointerException if the given object (argument) is null. public static …

Apr 18, 2013 · I have two java objects that are instantiated from the same class. MyClass myClass1 = new MyClass(); MyClass myClass2 = new MyClass(); If I set both of their properties to the exact …

In Java, the == operator compares the two objects to see if they point to the same memory location; while the .equals() method actually compares the two objects to see if they have the same object value.

Feb 10, 2012 · In Java, you can not access objects directly, you can only use references. Java does not copy or assign objects to each other. But you can copy and assign references to variables so they …

I want to initialize an array of Player objects for a BlackJack game. I've read a lot about various ways to initialize primitive objects like an array of ints or an array of strings but I cannot ta...

Feb 22, 2016 · Because with Java you can compare objects without first creating a Gson object and then calling toJson. Creating the Gson object and calling the logic needed to convert the actually …

Mar 15, 2011 · This is the case of the java object type casting. Here the method () function is originally the method of the superclass but the superclass variable cannot access the other methods of the …

In java 6 org.json.JSONArray contains the put method and in java 7 javax.json contains the add method. An example of this using the builder pattern in java 7 looks something like this:

Say I create one object and add it to my ArrayList. If I then create another object with exactly the same constructor input, will the contains() method evaluate the two objects to be the same? Assu...