public static final Letter A
public static final Letter B
public static final Letter C
public static final Letter D
public static final Letter E
public static final Letter F
public static final Letter G
public static final Letter H
public static final Letter I
public static final Letter J
public static final Letter K
public static final Letter L
public static final Letter M
public static final Letter N
public static final Letter O
public static final Letter P
public static final Letter Q
public static final Letter R
public static final Letter S
public static final Letter T
public static final Letter U
public static final Letter V
public static final Letter W
public static final Letter X
public static final Letter Y
public static final Letter Z
public static final Letter UNK
public static Letter[] values()
for (Letter c : Letter.values()) System.out.println(c);
public static Letter valueOf(java.lang.String name)
name - 要返回的枚举常量的名称。java.lang.IllegalArgumentException - 如果该枚举类型没有带有指定名称的常量java.lang.NullPointerException - 如果参数为空值