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Java String transform() method String transform() method added jdk 12. This method allows the application of a function to this string. The function should expect a single String argument and produce an R result. Any exception thrown by f() will be propagated to the caller. Java Program Example: class StringTransform{ public static void main(String args[]){ String str = "Transform"; } } Method: public <R> R transform​(Function<? super String,​? extends R> f)

Several new APIs have been added that facilitate the creation of unmodifiable collections. The List.copyOf Set.copyOf Map.copyOf  methods create new collection instances from existing instances. New methods have been added to the Collectors class in the Stream package. toUnmodifiableList toUnmodifiableSet toUnmodifiableMap   These allow the elements of a Stream to be collected into an unmodifiable collection.

For formal parameters of implicitly typed lambda expressions, allow the reserved type name `var` to be used, so that:     (var x, var y) -> x.process(y) is equivalent to:     (x, y) -> x.process(y) An implicitly typed lambda expression must use `var` for all its formal parameters or for none of them. In addition, `var` is permitted only for the formal parameters of implicitly typed lambda expressions --- explicitly typed lambda expressions continue to specify manifest types for _all_ their formal parameters, so it is not permitted for some formal parameters to have manifest types while others use `var`. The following examples are illegal:     (var x, y) -> x.process(y)         // Cannot mix 'var' and 'no var' in implicitly typed lambda expression     (var x, int y) -> x.process(y)     // Cannot mix 'var' and manifest types in explicitly typed lambda expression In theory, it would be...