Blog post for Java groovy-stream integration

groovy.groovy

Stream.from( x:[1,2,3], y:[4,5,6] )
      .map { x + y }
      .filter { it % 2 }
      .each { println it }

java7.java

Map<String,List<Integer>> map = new HashMap<String,List<Integer>>() {{
    put( "x", Arrays.asList( 1, 2, 3 ) ) ;
    put( "y", Arrays.asList( 4, 5, 6 ) ) ;
}} ;

Stream<Integer> s = Stream.from( map )
        .map( new Function<Map<String, Integer>, Integer>() {
            @Override
            public Integer call( Map<String, Integer> map ) {
                return map.get( "x" ) + map.get( "y" );
            }
        } )
        .filter( new Predicate<Integer>() {
            @Override
            public boolean call( Integer val ) {
                return val % 2 == 1;
            }
        } ) ;

while( s.hasNext() ) {
    System.out.println( s.next() );
}

java8.java

Map<String,List<Integer>> map = new HashMap<String,List<Integer>>() {{
    put( "x", Arrays.asList( 1, 2, 3 ) ) ;
    put( "y", Arrays.asList( 4, 5, 6 ) ) ;
}} ;

Stream.from( map )
        .map( e -> e.get( "x" ) + e.get( "y" ) )
        .filter( e -> e % 2 == 1 )
        .forEachRemaining( System.out::println ) ;