how to add to arraylist
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- Common ways to obtain ArrayList
private void myMethod ()
{
}
private void usingArrayList() { ArrayList<String> list = new ArrayList <>(Arrays.asList( "cat" , "cow" , "dog" )); list. add ( "fish" ); int size = list. size (); list.set(size - 1 , "horse" ); String removed = list.remove( 1 ); String second = list. get ( 1 ); }
ArrayList aList = new ArrayList (); aList. add ( "1" ); aList. add ( "2" ); aList. add ( "3" ); aList. add ( "4" ); aList. add ( "5" ); Collections.reverse(aList); System.out. println ( "After Reverse Order, ArrayList Contains : " + aList);
@Override public int addRef(Object ref) { if (_refs == null) _refs = new ArrayList (); _refs. add (ref); return _refs. size () - 1 ; }
class Test1 { public static void main(String[] s) { long st = System.currentTimeMillis(); List<String> l0 = new ArrayList<String>() {{ add ( "Hello" ); add ( "World!" ); }}; List<String> l1 = new ArrayList<String>() {{ add ( "Hello" ); add ( "World!" ); }}; List<String> l999 = new ArrayList<String>() {{ add ( "Hello" ); add ( "World!" ); }}; System.out. println (System.currentTimeMillis() - st); } }
private void updateResultVector( int position, int delta) { while ( this .resultVector. size () <= position) { this .resultVector. add ( 0 ); } final int component = this .resultVector. get (position); this .resultVector.set(position, component + delta); }
@Test public void testGenericListOfArrays() throws MalformedURLException { GenericBean<String> gb = new GenericBean<>(); ArrayList<String[]> list = new ArrayList <>(); list. add ( new String[] { "str1" , "str2" }); gb.setListOfArrays(list); BeanWrapper bw = new BeanWrapperImpl(gb); bw.setPropertyValue( "listOfArrays[0][1]" , "str3 " ); assertEquals( "str3 " , bw.getPropertyValue( "listOfArrays[0][1]" )); assertEquals( "str3 " , gb.getListOfArrays(). get ( 0 )[ 1 ]); }
public static <A, E extends A> A[] toArray(Enumeration<E> enumeration, A[] array) { ArrayList<A> elements = new ArrayList <>(); while (enumeration.hasMoreElements()) { elements. add (enumeration.nextElement()); } return elements. toArray (array); }
public void addBody(Body argBody) { bodies. add (argBody); if (bodies. size () == 1 ) { bodyA = argBody; } if (bodies. size () == 2 ) { bodyB = argBody; } }
@Override public void reduce(Iterable<Tuple2<Long, Long>> values, Collector<Tuple2<Long, Long[]>> out) { neighbors.clear(); Long id = 0L; for (Tuple2<Long, Long> n : values) { id = n.f0; neighbors. add (n.f1); } out.collect( new Tuple2<Long, Long[]>(id, neighbors. toArray ( new Long[neighbors. size ()]))); } }
public static <T> Collector<T, ?, Object[][]> toDataProvider() { return Collector.of( ArrayList:: new , (builder, entry) -> builder. add ( new Object[] {entry}), (left, right) -> { left.addAll(right); return left; }, builder -> builder. toArray ( new Object[][] {})); } }
public static Throwable[] getExceptionChain(Throwable throwable) { ArrayList<Throwable> list = new ArrayList <>(); list. add (throwable); while ((throwable = throwable.getCause()) != null) { list. add (throwable); } Throwable[] result = new Throwable[list. size ()]; return list. toArray (result); }
static <T> List<T> defensiveCopy(Iterable<T> iterable) { ArrayList<T> list = new ArrayList <T>(); for (T element : iterable) { list. add (checkNotNull(element)); } return list; } }
@Override public int addRef(Object ref) { if (_refs == null) _refs = new ArrayList (); _refs. add (ref); return _refs. size () - 1 ; }
ArrayList<String> list = new ArrayList<String> (); list. add ( "one" ); list. add ( "two" ); list. add ( "three" ); String listString = "" ; for (String s : list) { listString += s + "\t" ; } System.out. println (listString);
@Override public void accept(String s) { System.out. println (s); list. add (s); } });
private static void addLdcW(CodeAttribute.LdcEntry ldcs, ArrayList jumps) { int where = ldcs.where; LdcW ldcw = new LdcW(where, ldcs.index); int s = jumps. size (); for ( int i = 0 ; i < s; i++) if (where < ((Branch)jumps. get (i)).orgPos) { jumps. add (i, ldcw); return ; } jumps. add (ldcw); }
@Test public void testGenericListOfArraysWithElementConversion() throws MalformedURLException { GenericBean<String> gb = new GenericBean<>(); ArrayList<String[]> list = new ArrayList <>(); list. add ( new String[] { "str1" , "str2" }); gb.setListOfArrays(list); BeanWrapper bw = new BeanWrapperImpl(gb); bw.registerCustomEditor(String. class , new StringTrimmerEditor( false )); bw.setPropertyValue( "listOfArrays[0][1]" , "str3 " ); assertEquals( "str3" , bw.getPropertyValue( "listOfArrays[0][1]" )); assertEquals( "str3" , gb.getListOfArrays(). get ( 0 )[ 1 ]); }
@Override protected void verifyResultsWhenReScaling(ListSink sink, int startElementCounter, int endElementCounter) throws Exception { ArrayList<Integer> list = new ArrayList <>(); for ( int i = startElementCounter; i <= endElementCounter; i++) { list. add (i); } Collections.sort(sink.values); Assert.assertArrayEquals(list. toArray (), sink.values.toArray()); }
how to add to arraylist
Source: https://www.tabnine.com/code/java/methods/java.util.ArrayList/add
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