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Java Collections newSetFromMap() Method

The newSetFromMap() method of Java Collections class is used to return a set backed by the specified map. The resulting set displays the same ordering, concurrency, and performance characteristics as the backing map.

Syntax

Following is the declaration of newSetFromMap() method:

Parameter

Parameter Description Required/Optional
map It is the backing map. Required

Returns

The newSetFromMap() method returns the set backed by the specified map.

Exceptions

IllegalArgumentException- It throws this exception if map is not empty.

Compatibility Version

Java 1.6 and above

Example 1

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Output:

Set is: [Karan, Raj, Rahul]
Map is: {Karan=true, Raj=true, Rahul=true}

Example 2

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Output:

Set is: [1]
Map is: {1=true}

Example 3

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Output:

Users: []
Users: [Java, PHP]





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