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Java ArrayList add method

Java ArrayList add(E element) method

The ArrayListadd(E element) methodof Java ArrayList classappends a new value to the end of this list.

Syntax:

Parameter:

Here, "element" is an element to be appended to the list.

Return:

It always return "true". Don't worry about the Boolean return value. It always there as other classes in the collections family need a return value in the signature when adding an element.

Example 1

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Output:

[element1, true, last element]

Example 2

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Output:

does not compile.

This time the compiler knows that only Integer values are allowed in and prevents the attempt to add a String value.

Java ArrayList add(int index, E element) method

The add(int index, E element) method of Java ArrayList class inserts a specific element in a specific index of ArrayList. It shifts the element of indicated index if exist and subsequent elements to the right.

Syntax:

Parameter:

"index": index at which the element will be inserted.

"element": is an element to be inserted.

Return:

Return nothing.

Example 3

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Output:

["black", "red" , "white", "blue"]

Example 4

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Output:

[1, "e1", "e2" , 1]

Example 5

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Output:

throwsIndexOutOfBoundsException

Next TopicJava ArrayList




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