7.2.2. Adding and Replacing a Key Value

Red Hat 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 7.3. Adding and Replacing a Key Value

Add an entry key with value as the key's value.
```
cache.put("key", "value");
```

Procedure 7.4. Replacing a Key Value

The following code searches for keys (named key and key2). If the two specific keys beings searched for are not found, JBoss Data Grid creates two new keys with the specified key names and values.
```
cache.putIfAbsent("key", "newValue");
cache.putIfAbsent("key2", "value2");
```
The following code confirms that the value of the stored key equals the value we wanted to store.
```
assertEquals(cache.get("key"), "value");
assertEquals(cache.get("key2"), "value2");
```

See Also: