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View Compilation Error

0_0_33165782_613\Main.java:6: 错误: 找不到符号
  private static final Set<Character> x = Set.of('p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z');
                                             ^
  符号:   方法 of(char,char,char,char,char,char,char,char,char,char,char)
  位置: 接口 Set
0_0_33165782_613\Main.java:7: 错误: 找不到符号
  private static final Set<Character> X = Set.of('C', 'D', 'E', 'I');
                                             ^
  符号:   方法 of(char,char,char,char)
  位置: 接口 Set
2 个错误


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