CODEWITHSUNDEEP
javahashhashmap
hello_its_me
hello_its_me

Reputation: 793

Add value to key only with condition for hashmap

Is there any way I could add a value (or change a key's value) to a key only if a condition is met?

I mean, something like:

myHashMap.add(key, if(true){//add this value} else {//add a different value});

Upvotes: 0

Views: 9147

Answers (3)

Reut Sharabani
Reut Sharabani

Reputation: 31339

Yes, use if-else:

if (condition){
    myHashMap.put(key, value);
} else {
    myHashMap.put(key, otherValue);
}

If you insist on making it short use the ternary operator (see the Oracle tutorial, The Conditional Operators part):

myHashMap.put(key, condition ? value : otherValue);

Upvotes: 4

Rogue
Rogue

Reputation: 11483

Just to tack on to Reut's answer, if you're wanting to operate on a value already in the map, there's Map#compute as of Java 8:

Map<String, String> example = new HashMap<>();
//pretending we have values...
example.compute("My Key", (key, oldValue) -> oldValue == null ? "New" : "Read");

Upvotes: 3

Cisco
Cisco

Reputation: 23042

Not exactly, you would have to do something like:

// Assuming a boolean value is returned
if (myHashMap.get(key)) {
    myHashMap.put(key, value);
} else {
    myHashMap.put(key, differentValue);
}

Upvotes: 1

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