method values()

Question

hi guys
I have some questions about this code:

1) why do we use : in the loop?what does it do?

2) what does valueof() do exactly?Is that for sending parameter?

enum Color
{
RED, GREEN, BLUE;
}

public class Test
{
public static void main(String[] args)
{
Color[] arr= Color.values();

for (Color col : arr)
{
System.out.println(col.name());

}

System.out.println(Color.valueOf("RED"));

}
}

Answer 1

1) That's according syntax of "for each loop (short form loop for iteratables, collections, arrays..)"
That's a syntax :
for(datatype variable : a collection) {..}

2)valueOf() return enum value from defined enum...

Edit : saeedeh
For more refer this :
https://www.javatpoint.com/enum-in-java

Answer 2

Jayakrishna🇮🇳 ok thank you