How can I return two ArrayList in Java?

It is not possible two return statement from single function but you can wrap in new Map or List and can return two ArrayList. You can make a class with two list as its member and then can return this class object with your lists. You can just return them in an array. There is no easy way to do this in Java.

Can you return 2 values in Java?

You can return only one value in Java. If needed you can return multiple values using array or an object.

Can you return two arrays in Java?

We can return an array in Java. Below is a Java program to demonstrate the same. We can use Pair in Java to return two values. We can encapsulate all returned types into a class and then return an object of that class.

Can we split ArrayList in Java?

Sometimes we need to split the given ArrayList in multiple small ArrayLists based on the size in Java. In other words, divide a list into lists of n size. The output returns consecutive sublists of a list, each of the same size (the final list may be smaller).

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Can we compare two ArrayList in Java?

Java provides a method for comparing two Array List. equals() is the method used for comparing two Array List. … It compares the Array lists as, both Array lists should have the same size, and all corresponding pairs of elements in the two Array lists are equal.

What is return in Java?

return is a reserved keyword in Java i.e, we can’t use it as an identifier. It is used to exit from a method, with or without a value. return can be used with methods in two ways: Methods returning a value : For methods that define a return type, return statement must be immediately followed by return value.

How can I return two Boolean values in Java?

There are a number of ways to do this:

  1. Return null to indicate that there is nothing present like java. …
  2. Create a custom class to return both parameters. …
  3. Use a 1 element array for one of the return values. …
  4. Use a library like Google Guava that has a Pair/Tuple class: Pair method() { return new Pair(flag, answer); }

Can you return two arrays?

Summary. JavaScript doesn’t support functions that return multiple values. However, you can wrap multiple values into an array or an object and return the array or the object. Use destructuring assignment syntax to unpack values from the array, or properties from objects.

Can you return nothing in Java?

In Java, a null value can be assigned to an object reference of any type to indicate that it points to nothing. The compiler assigns null to any uninitialized static and instance members of reference type. In the absence of a constructor, the getArticles() and getName() methods will return a null reference.

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How do you return an array?

How to return an array in Java

  1. import java.util.Arrays;
  2. public class ReturnArrayExample1.
  3. {
  4. public static void main(String args[])
  5. {
  6. int[] a=numbers(); //obtain the array.
  7. for (int i = 0; i < a.length; i++) //for loop to print the array.
  8. System.out.print( a[i]+ ” “);

How do you split an ArrayList method?

1) First split the string using String split() method and assign the substrings into an array of strings. We can split the string based on any character, expression etc. 2) Create an ArrayList and copy the element of string array to newly created ArrayList using Arrays. asList() method.

How do you separate elements in an ArrayList?

split arraylist items java” Code Answer

  1. List<Integer> numbers = new ArrayList<Integer>(
  2. Arrays. asList(5,3,1,2,9,5,0,7)
  3. );
  4. List<Integer> head = numbers. subList(0, 4);
  5. List<Integer> tail = numbers. subList(4, 8);
  6. System. out. println(head); // prints “[5, 3, 1, 2]”
  7. System. out. println(tail); // prints “[9, 5, 0, 7]”

What are the methods in ArrayList?

Methods of ArrayList

Method Description
void ensureCapacity(int requiredCapacity) It is used to enhance the capacity of an ArrayList instance.
E get(int index) It is used to fetch the element from the particular position of the list.
boolean isEmpty() It returns true if the list is empty, otherwise false.
Iterator()

Is equal to Java?

In Java, string equals() method compares the two given strings based on the data/content of the string. If all the contents of both the strings are same then it returns true. If all characters are not matched then it returns false.

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How compare two ArrayList and remove duplicates?

Approach:

  1. First create two ArrayList and add values of list.
  2. Convert the ArrayList to Stream using stream() method.
  3. Set the filter condition to be distinct using contains() method.
  4. Collect the filtered values as List using collect() method. This list will be return common element in both list.
  5. Print list3.

How do you swap elements in an ArrayList?

We can swap two elements of Array List using Collections. swap() method. This method accepts three arguments. The first argument is the ArrayList and the other two arguments are the indices of the elements.

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