Java is an object oriented language, which means that one of its core principles is inheritance. All classes (and hence the objects created from them) are derived from a parent. In this way, classes inherit variables, methods, and classes from their parent so that they do not have to redefine them. In Java's case, the common parent of all classes is Object. This gives every class some basic functionality, such as the equals, toString, and wait methods. Besides uniformity, another advantage of inheritance is clear organization. Imagine if we could not guarantee the comparison of two objects with the equals method. Finally, a global parent class means that every class, no matter how specific, can be generalized into the parent's type (Object o = new String()).
No Primitive data types do not have objects. As of Java 1.5, all primitive types in Java have "wrapper" classes. These classes serve two purposes: # They keep all type-specific methods together in one place. # They allow primitive types to be used in situations which take advantage of generics (also introduced in Java 1.5).
There are two main categories of variables in Java. They are primitive and non primitive. Primitive data types are the basic data types like int, float, char etc. These are not objects. The other non primitive data types are all types of Java Objects. Example: String, ArrayList etc.
How a Java variable would act depends on the variable's data type. Variables of the primitive data types like int, char, float etc would not act as objects. But apart from them, all other data types would act as Objects. Almost all data types would extend from java.lang.Object and would behave as objects.
Java IS a pure OOP language. All types, including the built-in types, are implemented as objects.
Unfortunately you cannot save a HashMap object by means of only using core functionality in Java. The good thing is that you have, by all means, can use a Database software to do the job, move the objects and map them to a table.
All of them
We all current life has a single common ancestor.
LUCA stands for Last Universal Common Ancestor, the last organism that is the common ancestor of all life on Earth.
Java is not a completely object oriented language, because not all values in Java are Objects. For example, the basic numeric types such as int, long, double, etc., are not objects and need to be "boxed" into objects in order to pass them as Object parameters or call methods on them.
The Java superclass Object says that all Java objects have an equals method. Thus Comparator has an equals method.
A bobcat is a specie of lynx, which is a member of the family Felidae or cat family.
Yes. If you go back far enough, all life on Earth shares a common ancestor.
lemur
No Primitive data types do not have objects. As of Java 1.5, all primitive types in Java have "wrapper" classes. These classes serve two purposes: # They keep all type-specific methods together in one place. # They allow primitive types to be used in situations which take advantage of generics (also introduced in Java 1.5).
yes, theses ancestors are called common decent
You could be their grandchild. Or you may not be related at all, as not sharing a common ancestor.
lemur