Java 8:通用类型推断改进

使用JEP 101:广义目标类型推断,这

final List bools = Arrays.asList(true,false, true);
final List string = bools.stream()
        .map(x -> x ? 'X' : 'O')
        .collect(Collectors.toList());

应该可以减少

    final List bools = Arrays.asList(true, false, true);
    final List string = bools.stream()
            .map(x -> x ? 'X' : 'O')
            .collect(Collectors.toList());

在Java 8中,但后者不编译:

Type mismatch: cannot convert from List