List Introduction in Apex Salesforce

List Introduction in Apex Salesforce

• list is an interface.
• A list is an ordered collection of elements that are distinguished by their indices.
• list elements can be of any data type – primitive types, collections, subjects, usual – defined types and built – in apex types.

Index0                             Index1                         Index2                     Index3                   Index4

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Block

• Insertion order is preserved.
• can grow dynamically at run time.
• Duplicate values are allowed.
• Null values are accepted.