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Java 2021-09-14 19:46:02
generic variable java
List<String> yourList=new ArrayList<>();//short form of Arraylist<String> as the compiler infers the <String> from the left side of the assignment yourList.add("Hello"); yourList.add(123);//compiler Error String firstElem... Add solution -
Java 2021-09-14 18:44:02
java return new instance of generic type
public static <E> void append(List<E> list, Class<E> cls) throws Exception { E elem = cls.newInstance(); // OK list.add(elem); } //You can invoke the append method as follows: List<String> ls = new ArrayList<>(); ap... Add solution -
Java 2021-09-10 21:33:02
string array to arraylist
new ArrayList<>(Arrays.asList(array)); Add solution -
Java 2021-08-29 14:53:01
2d arraylist in java
int vertexCount = 3; ArrayList<ArrayList<Integer>> graph = new ArrayList<>(vertexCount); //Next, we'll initialize each element of ArrayList with another ArrayList: for(int i=0; i < vertexCount; i++) { graph.add(new ArrayList()); } Add solution
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