Java 8 stream operation

Suppose I have a character stream named s Is it possible to convert a single string into a unary operation of two strings?

Therefore, if the original stream contains {a, B, C} and the operation converts each string s to s "1" and s "2", we will get: {A1, A2, B1, B2, C1, C2}

Is this possible (using lambda expressions)?

Solution

Yes, you can use flatmap or something

stream.flatMap(s -> Stream.of(s + "1",s + "2"));

Example:

Stream.of("a","b","c")                   // stream of "a","c"
.flatMap(s -> Stream.of(s + "1",s + "2")) // stream of "a1","a2","b1","b2","c1","c2"
.forEach(System.out::println);

Output:

a1
a2
b1
b2
c1
c2