Java String unicode相关问题

public class Test {

	public static void main(String[] args) {
		String str = new String("\u10400");
		System.out.println("str.length():" + str.length());
		System.out.println(str);
		System.out.println(Arrays.toString(str.toCharArray()));

		char[] ch = Character.toChars(0x10400);
		String str2 = new String(ch);
		System.out.println("str2.length():" + str2.length());
		System.out.println(str2);
		System.out.println(Arrays.toString(str2.toCharArray()));
	}
}