static fields problems in initialization

I have searched the JDK many times, but I can’t find where the out field is initialized

such as

public static final InputStream in = null;
public static final PrintStream out = null;
public static final PrintStream err = null;

So when are these static fields in the System class initialized?

>Solution :

In openjdk-11 java.lang.System on line 1968

setOut0(newPrintStream(fdOut, props.getProperty("sun.stdout.encoding")));

which is in private static void initPhase1() and that is documented to

Initialize the system class. Called after thread initialization.