Stream6.java

consumerList
        .stream()
        // map intermediate operation
        // 'map' is used to transform one element type into other, here we transformed Consumer into String
        .map(Consumer::getName)
        // 'distinct' intermediate operation
        .distinct()
        // 'sorted' intermediate operation
        .sorted()
        // 'reduce' terminal operation
        // 'reduce' is used to produce single output
        // .reduce(String::concat);
        .reduce((preVName, nextName) -> preVName + " " + nextName)
        .ifPresent((result) -> System.out.println(result));

// Outout: Bob Malli Satti Sri
// In above code you can also use 'reduce(String::concat)'
// Please read Optional to understand more on ifPresent method