Interview questions

Method 1:

import java.util.HashMap;
import java.util.Map;
 
public class Test {
    private static final Map<Integer, String> tempMap = new HashMap<>

Java 8 and lower Versions:

Map<String, String> myMap = createNewMap();
 
private static Map<String, String> createNewMap

1. Naive solution

public class TestJava {
  public static void main(String[] args) {
	String str = "w3spoint";
 
        // using simple 

There are 2 main reasons of Char array preference over string for passwords.

Strings are immutable:

As you know, Strings are immutable in Java which means we … Read More

Best Solution

import java.security.SecureRandom;
import java.util.Locale;
import java.util.Objects;
import java.util.Random;
 
public class TestJava {
 
	public static void main(String[

Java 1.7 or Higher Versions

import java.util.concurrent.ThreadLocalRandom;
 
public class TestJava {
 
	public static void main(String[] args) {
	    int min 

Increase heap size in java

Set or Increase the maximum heap size:

java -Xmx256m TestData.java

Where:
TestData.java: represents java application file.

Java command memory options

$ java 

We can synchronized the overridden method in subclass. See the below example.

class ShowTest {
 
    void display(int num) {
        System.out.

What is a web service in java?

Web services refers to the standardized way of application-to-application interaction using the XML, SOAP, WSDL and UDDI open standards over … Read More

What are the build tools in java?

A build tool is utility program to automate the process of repetitive tasks like compiling source code and creating files … Read More