Merging lists without loop with Guava

Using FluentIterable.transformAndConcat.

Applies function to each element of this fluent iterable and returns a fluent iterable with the concatenated combination of results. function returns an Iterable of results.

Usage

List<String> combined = FluentIterable.from(a)   .transformAndConcat(new Function<List<String>, List<String>>() { @Override public List<String> apply(List<String> elem) { return Arrays.asList(elem.toArray(new String[elem.size()])); }   }).toList(); System.out.println(combined.toString()); 

Result

[a, b, c, d, 1, 2, 3, 4] 

Dependency

'com.google.guava:guava:15.0'  

Merging lists without loop with Guava

Using FluentIterable.transformAndConcat.

Applies function to each element of this fluent iterable and returns a fluent iterable with the concatenated combination of results. function returns an Iterable of results.

Usage

List<String> combined = FluentIterable.from(a) .transformAndConcat(Functions.identity()) .toList(); 

Merging lists without loop with Guava

Using FluentIterable.transformAndConcat.

Applies function to each element of this fluent iterable and returns a fluent iterable with the concatenated combination of results. function returns an Iterable of results.

Usage

List<String> combined = FluentIterable.from(a) .transformAndConcat(new Function<List<String>, List<String>>() { @Override public List<String> apply(List<String> elem) { return Arrays.asList(elem.toArray(new String[elem.size()])); } }).toList(); System.out.println(combined.toString()); 

Result

[a, b, c, d, 1, 2, 3, 4] 

Dependency

'com.google.guava:guava:15.0' 

Merging lists without loop with Guava

Using FluentIterable.transformAndConcat.

Applies function to each element of this fluent iterable and returns a fluent iterable with the concatenated combination of results. function returns an Iterable of results.

Usage

List<String> combined = FluentIterable.from(a) .transformAndConcat(new Function<List<String>, List<String>>() { @Override public List<String> apply(List<String> elem) { return Arrays.asList(elem.toArray(new String[elem.size()])); } }).toList(); System.out.println(combined.toString()); 

Result

[a, b, c, d, 1, 2, 3, 4] 

Dependency

'com.google.guava:guava:15.0' 

Solution without loop with Guava

Using FluentIterable.transformAndConcat and JDK 1.7 for simplicity

Applies function to each element of this fluent iterable and returns a fluent iterable with the concatenated combination of results. function returns an Iterable of results.

ImmutableList<String> combined = FluentIterable.from(a) .transformAndConcat(new Function<List<String>, List<String>>() { @Override public List<String> apply(List<String> elem) { return Arrays.asList(elem.toArray(new String[elem.size()])); } }).toList(); System.out.println(combined.toString()); 

Result

[a, b, c, d, 1, 2, 3, 4] 

Merging lists without loop with Guava

Using FluentIterable.transformAndConcat.

Applies function to each element of this fluent iterable and returns a fluent iterable with the concatenated combination of results. function returns an Iterable of results.

Usage

List<String> combined = FluentIterable.from(a) .transformAndConcat(new Function<List<String>, List<String>>() { @Override public List<String> apply(List<String> elem) { return Arrays.asList(elem.toArray(new String[elem.size()])); } }).toList(); System.out.println(combined.toString()); 

Result

[a, b, c, d, 1, 2, 3, 4] 

Dependency

'com.google.guava:guava:15.0'