Lambda function java

There are few functional interfaces namely Consumer, Supplier, Predicate and Functions
- Consumer: 
  + 1 input, 0 output
  + java.util.function.Consumer
  + example: Consumer<List<String>> printConsumer = list -> list.stream().forEach(System.out::println);

- Supplier: 
  + 0 input, 1 output
  + java.util.function.Supplier
  + example: Supplier<Double> doubleSupplier1 = () -> Math.random();

- Predicate: 
  + 1 input, 1 boolean output
  + java.util.function.Predicate
  + example: Predicate<String> nameStartsWithS = str -> str.startsWith("S");

- Function: 
  + 1 input, 1 output
  + java.util.function.Function
  + example: Function<String, Integer> nameMappingFunction = String::length;

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