Java语言一元运算符实例解析

public interface UnaryOperator<T> extends Function<T, T> {  /**   * Returns a unary operator that always returns its input argument.   *   * @param <T> the type of the input and output of the operator   * @return a unary operator that always returns its input argument   */  static <T> UnaryOperator<T> identity() {    return t -> t;  }}

@Test  public void test(){    super.print(UnaryOperator.identity().apply(1));//输出1    super.print(UnaryOperator.identity().apply(false));//输出false    super.print(UnaryOperator.identity().apply("string"));//输出string  }