Can we declare array without size in Java?

Inhaltsverzeichnis:

1. Can we declare array without size in Java?
2. Can we declare an array without assigning the size of an array?
3. How do you declare an array without size?
4. What is biggest advantage and disadvantage of Java?
5. Why is array used?
6. How do you overcome limitations of an array?
7. What is difference between Array and List?
8. What is the difference between Array and pointer?
9. Is pointer faster than array?
10. What is relation between Array and pointer?
11. Is a pointer an array?
12. What is the difference between array of Pointer and Pointer to array?
13. How do I return an array pointer?

Can we declare array without size in Java?

Couple of things, as people have said regular arrays in Java must be declared with a "new" statement as well as a size. You can have an empty array if you want, but it will be of size 0. Now, if you want a dynamic array you can use an ArrayList.

Can we declare an array without assigning the size of an array?

You don't declare an array without a size, instead you declare a pointer to a number of records. ... And you will have to allocate the size at some point in time and initialzie the array. bills = (int*)malloc(sizeof(int)*items); The same goes for arrays of other data types.

How do you declare an array without size?

Answer: No. It is not possible to declare an array without specifying the size. If at all you want to do that, then you can use ArrayList which is dynamic in nature.

What is biggest advantage and disadvantage of Java?

Java has also removed the features like explicit pointers, operator overloading, etc., making it easy to read and write. Java uses an object-oriented paradigm, which makes it more practical. Everything in Java is an object which takes care of both data and behavior.

Why is array used?

An array is a data structure, which can store a fixed-size collection of elements of the same data type. An array is used to store a collection of data, but it is often more useful to think of an array as a collection of variables of the same type. ... All arrays consist of contiguous memory locations.

How do you overcome limitations of an array?

This cannot be done with an array because the order is defined by the actual location in memory, not as a secondary stored value. In the end, the linked list overcomes the array's flexibility limitation by paying a higher memory cost and sacrificing constant-time random access.

What is difference between Array and List?

An array stores a fixed-size sequential collection of elements of the same type, whereas list is a generic collection.

What is the difference between Array and pointer?

An array is a collection of elements of similar data type whereas the pointer is a variable that stores the address of another variable. An array size decides the number of variables it can store whereas; a pointer variable can store the address of only one variable in it.

Is pointer faster than array?

Array access is faster if the array is allocated in the local stack scope or in static memory since it can be directly accessed via an offset of the value in the EBP register or via a direct offset from a fixed address, rather than attempting to access the value of a pointer in a stack variable, and then adding to that ...

What is relation between Array and pointer?

An array is represented by a variable that is associated with the address of its first storage location. A pointer is also the address of a storage location with a defined type, so D permits the use of the array [ ] index notation with both pointer variables and array variables.

Is a pointer an array?

An array is an array and a pointer is a pointer, but in most cases array names are converted to pointers. A term often used is that they decay to pointers.

What is the difference between array of Pointer and Pointer to array?

Pointer to an array is also known as array pointer. We are using the pointer to access the components of the array. int a[3] = {3, 4, 5 }; int *ptr = a; We have a pointer ptr that focuses to the 0th component of the array.

How do I return an array pointer?

Returning pointer pointing to the array

1. #include
2. int *getarray()
3. {
4. int arr[5];
5. printf("Enter the elements in an array : ");
6. for(int i=0;i