void (String[] args) { List<String> list = Arrays.asList("a", "b", "c", "d"); list.stream().filter(n -> !n.isEmpty()).peek(o -> { System.out.println("Peek: "+o); System.out.println("Peek2: "+o); }).for<caret>Each(e -> { String n = ""; System.out.println(e); if (e.equals("c")) return; System.out.println(e + "!!!" + n); new Runnable() {String e = "x"; public void run() { System.out.println(e); for(int i=0; i<10; i++) { if(e.length() == i) return; } }}.run(); }); list.stream().filter("b"::equals).findFirst().ifPresent(str -> { System.out.println("Found:"); System.out.println(str); }); list.stream().filter(qq -> "b".equals(qq)).findFirst().ifPresent(str -> { System.out.println("Found:"); if(str.isEmpty()) return; // return inside ifPresent is not supported System.out.println(str); }); StringBuilder res = list.stream().filter(str -> str != null).collect(StringBuilder::new, (sb, s) -> { s = "[" + s + "]"; sb.append(s); }, StringBuilder::append); System.out.println(res); System.out.println(list.stream().filter(n -> !"a".equals(n)).flatMapToInt(l -> IntStream.range(0, 3).peek(n -> { System.out.println("In flatmap idx: "+n); System.out.println("In flatmap: "+l); })).count()); }