What is null What is String is used and and char index What is pass by reference and call by reference Diff between array list and linked list

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Null is a special value in programming that represents the absence of a value. String is a sequence of characters. Pass by reference means passing the memory address of a variable, while call by reference means passing the value of a variable.

Null is used to indicate that a variable does not have a value assigned to it.
String is a data type used to represent text as a sequence of characters. Example: 'Hello World'.
Char index refers to the position of a character in a string. Example: In the string 'Hello', the char index of 'H' is 0.
Pass by reference means passing the memory address of a variable to a function. Call by reference means passing the value of a variable to a function.
ArrayList and LinkedList are both data structures in Java. ArrayList uses an array to store elements, while LinkedList uses nodes linked together. ArrayList is faster for accessing elements by index, while LinkedList is faster for adding or removing elements.

What is null What is String is used and and char index What is pass by reference and call by reference Diff between array list and linked list

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