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Showing content from https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/util/function/Function.html below:

Function (Java SE 11 & JDK 11 )

- Method Detail
  - apply
```
R apply(T t)
```
    Applies this function to the given argument.
    
    Parameters:
    
    t - the function argument
    
    Returns:
    
    the function result
  - compose
```
default <V> Function<V,R> compose(Function<? super V,? extends T> before)
```
    Returns a composed function that first applies the before function to its input, and then applies this function to the result. If evaluation of either function throws an exception, it is relayed to the caller of the composed function.
    
    Type Parameters:
    
    V - the type of input to the before function, and to the composed function
    
    Parameters:
    
    before - the function to apply before this function is applied
    
    Returns:
    
    a composed function that first applies the before function and then applies this function
    
    Throws:
    
    NullPointerException - if before is null
    
    See Also:
    
    andThen(Function)
  - andThen
```
default <V> Function<T,V> andThen(Function<? super R,? extends V> after)
```
    Returns a composed function that first applies this function to its input, and then applies the after function to the result. If evaluation of either function throws an exception, it is relayed to the caller of the composed function.
    
    Type Parameters:
    
    V - the type of output of the after function, and of the composed function
    
    Parameters:
    
    after - the function to apply after this function is applied
    
    Returns:
    
    a composed function that first applies this function and then applies the after function
    
    Throws:
    
    NullPointerException - if after is null
    
    See Also:
    
    compose(Function)
  - identity
```
static <T> Function<T,T> identity()
```
    Returns a function that always returns its input argument.
    
    Type Parameters:
    
    T - the type of the input and output objects to the function
    
    Returns:
    
    a function that always returns its input argument

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