The asterisk (*) operator in Python has more than one meaning attached to it. We can use it as a Multiplication operator, Repetition operator, used for Unpacking the iterables, and Used as function *args. Single asterisk as used in function declaration allows variable number of arguments passed from calling environment. Inside the function it behaves as a tuple. As the multiplication operator Generally, the start (*) operator is used for multiplication purposes. For numeric data the asterisk (*) is used as a multiplication operator. Let’s take an example and see how the star operator works on numeric operands. Example a ... Read More

By using the dict() method in python we can create a python dictionary with the list comprehension. The syntax of dict() method is given below. Following is the syntax for this dict(**kwarg) Keyword arguments. We can pass one or more keyword arguments. If no keyword argument is passed then the dict() method will create an empty dictionary object. The syntax for creating a dictionary with list comprehension: dict(list_comprehension) Creating dictionary using list comprehension Instead of sending a number of keywords here we need to send a list of tuples with key value pairs to the dict() method. Let’s ... Read More

While creating a function the single asterisk (*) defined to accept and allow users to pass any number of positional arguments. And in the same way the double asterisk (**) defined to accept any number of keyword arguments. The single asterisk (*) can be used when we are not sure how many arguments are going to be passed to a function and those arguments that are not keywords. The double asterisk (**kwargs) can be used to pass keywords, when we don't know how many keyword arguments will be passed to a function, which will be in a dict named ... Read More

You can either setLength to be 0 or create a new StringBuilder() instance. See the example below −Examplepublic class Tester {    public static void main(String[] args) {       StringBuilder builder = new StringBuilder();       builder.append("sample");       System.out.println(builder.toString());       builder.setLength(0);       System.out.println(builder.toString());       builder.append("sample");       System.out.println(builder.toString());    } }Outputsample sample

Performance wise, there is hardly any difference. But it is good to keep a variable local to the scope it is used. So declaring a variable inside Java loop is generally preferred.

You can simply iterate through list and fill the array as shown below −import java.util.ArrayList; import java.util.List; public class Tester {    public static void main(String[] args) {       List list = new ArrayList();       list.add(new Integer(1));       list.add(new Integer(2));       list.add(new Integer(3));       list.add(new Integer(4));       int[] array = new int[list.size()];       for(int i=0;i

Yes. From Java 8 onwards, we can do so using method references.Method references help to point to methods by their names. A method reference is described using "::" symbol. A method reference can be used to point the following types of methods −Static methodsInstance methodsConstructors using new operator (TreeSet::new)Method Reference ExampleCreate the following Java program using any editor of your choice in, say, C:\> JAVA.Java8Tester.java Live Demo import java.util.List; import java.util.ArrayList; public class Java8Tester {    public static void main(String args[]) {       List names = new ArrayList(); names.add("Mahesh");       names.add("Suresh");       names.add("Ramesh");       ... Read More

A method can give multiple values if we pass an object to the method and then modifies its values. See the example below −Examplepublic class Tester {    public static void main(String[] args) {       Model model = new Model();       model.data1 = 1;       model.data2 = 2;       System.out.println(model.data1 + ", " + model.data2);       changeValues(model);       System.out.println(model.data1 + ", " + model.data2);    }    public static void changeValues(Model model) {       model.data1 = 100;       model.data2 = 200;    } } class Model {    int data1;    int data2; }Output1, 2 100, 200

A static method belongs to class not to object instance thus it cannot be overridden or implemented in a child class. So there is no use of making a static method as abstract.

Call by Value means calling a method with a parameter as value. Through this, the argument value is passed to the parameter.While Call by Reference means calling a method with a parameter as reference. Through this, the argument reference is passed to the parameter.In call by value, the modification done to the parameter passed does not reflect in the caller's scope while in call by reference, the the modification done to the parameter passed are persistent and changes are reflected in the caller's scope.But Java uses only call by value. It creates a copy of references and pass them as ... Read More