How-to articles, tricks, and solutions about JAVA
You can use the Gson library to convert a JSON string to a Map in Java.
To convert a JsonObject to a String in Java, you can use the JsonObject.toString method.
To convert a List to an array in Java, you can use the toArray() method of the List interface. This method returns an array containing all of the elements in the list in the proper order.
To convert a Long object to an Integer object in Java, you can use the intValue() method of the Long class, which returns the value of the Long as an int.
To convert a Set to a List in Java without creating a new List object, you can use the List constructor that takes a Collection as an argument.
To convert a String array to an ArrayList in Java, you can use the following steps:
You can use the toArray() method of the ArrayList class to convert an ArrayList of strings to a string array. Here's an example:
To convert a string to an integer in Android, you can use the Integer.parseInt method.
To convert a string to a hexadecimal string in Java, you can use the encodeHexString method of the org.apache.commons.codec.binary.Hex class.
There are a few ways to convert a character to an integer in Java.
To convert a double to an int in Java, you can use the intValue() method of the Double class.
In Java, you can convert a double to a string using the Double.toString() method or the String.valueOf() method.
To convert an Integer object to a Long object in Java, you can use the longValue() method of the Integer class, which returns the value of the Integer object as a long.
To convert an ISO 8601-compliant string to a java.util.Date object, you can use the java.text.SimpleDateFormat class and specify the "yyyy-MM-dd'T'HH:mm:ss.SSSXXX" format, which is the ISO 8601 format for dates with a time and time zone.
To convert JSON data to a Java object, you can use the fromJson method of the Gson class.
To convert a string to a character array in Java, you can use the toCharArray method of the String class. This method returns a new character array that represents the same sequence of characters as the string.
To copy a file from one directory to another in Java, you can use the Files.copy method from the java.nio.file package.
To add external JAR files to an IntelliJ IDEA project, you can follow these steps:
If you are trying to execute a query using Hibernate and are getting an error saying "could not extract ResultSet," it could be due to a few different issues:
To create a directory in Java if it does not exist, you can use the java.nio.file.Files class and its createDirectory method.
There could be several reasons why you are getting the error "Could not resolve archetype" when trying to create a Maven project in Eclipse.
To create an instance of a generic type in Java, you can use the newInstance() method of the Class class, along with the Type and TypeVariable classes.
To create an instance of a class using its class name and calling its constructor, you can use the Class.forName method and the newInstance method.
In Java, a data access object (DAO) is a design pattern that provides an abstract interface for accessing data from a database.