has<Field>() methods in Java

[Janac Meena]

Hello,

I see in the documentation that there is a way to check for the existence of a field in a message, i.e. 

message Foo {

 string name = 1;

} 

In my Java code, I was hoping to do 

// Assuming object "foo" has been initialized

if (foo.hasName()) {

// do stuff

}

But I am unable to find the hasX() methods.

What's going on? 

[Ilia Mirkin]

These are gone in proto3. The has* stuff is available with proto2.

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