Invariant attribute must be one word only

I need to create an attribute called name in a class called Client. This attribute is an invariant that must be one word only.
How do I do this?

you can use this to check if the String contains a space, i don't know if this is what you are looking for~~~HAHA~~~~
String name="roberto carlos";
int indexOfSpace=name.indexOf(" "); // it return -1 if no space is found in the String
if(indexOfSpace!=-1)
System.out.println("The String doesn't contain a space");
else
System.out.println("The String contains a space");

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