JAVA CUSTOM DATA TYPES

Custom data types is data type (which can hold value) but created by you.

Let us say, I have a class Dog.

public class Dog

{

public String breed;

public String name;

public float weight;

public void bark()

{}

public void play()

{}

}

So, looking at the class structure, it can store value of breed, name and weight. 

So this is different than the int datatype which can store single integer value.

So if I want a person class to hold all values associated with dog, I take a variable to type Dog class.

public class Person // [access modifiers] [class - the keyword] [class_name]

{

// [access modifiers] [datatype] [variable_name]

public String name; 

public int age;

public char gender;

public Dog dog; // not a int or char datatype but a Dog type.

[access modifiers] [return type] [method_name]

public void walk()

{}

public void eat()

{}

public void run(int kms)

{}

}

So, every  java class is a custom data type.