Default value of primitive type char

public class Test
{
	char ch1 = '\u0000';
	char ch2;
	char ch3 = ' ';
	
	public static void main(String [] args)
	{
		// Do something...
	}
}

In the code above, (if I understand correctly), the values for ch1 and ch2 are null which is represented by whitespace. However, I am curious, is the value for ch3 also null (which is also represented by whitespace). Are all three variables interchangeable or just ch1 and ch2? Any feedback is much appreciated.