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6.4.2. Adding and Replacing a Key Value

6.4.2. Adding and Replacing a Key Value

JBoss Data Grid offers a thread-safe data structure.

The following procedure is an example that defines what each line entered into the DefaultCacheQuickstart.java file does:

Procedure 6.3. Adding and Replacing a Key Value

Add an entry with key as the key value.
```
cache.put("key", "value");
```
```
cache.put("key", "value");
```
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Check if the key value is missing. If the value is not found, replace the absent value with key. If the value is found, no change occurs.
```
cache.putIfAbsent("key", "newValue");
```
```
cache.putIfAbsent("key", "newValue");
```
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See Also:

Section A.1, “About Key-Value Pairs”

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