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How-to articles, tricks, and solutions about JAVA

Basic Java Float and Integer multiplication casting

To perform a multiplication between a float and an integer in Java, you can simply use the * operator as you would with any other numeric data types. The result of the multiplication will be a float, even if one of the operands is an integer.

java math

Best way to convert an ArrayList to a string

To convert an ArrayList to a string in Java, you can use the join method of the String class, which allows you to join the elements of the ArrayList into a single string. Here's an example of how you might do this:

java string arraylist

Best way to create enum of strings?

The best way to create an enum of strings in Java is to define the enum type with a String field, and then specify the possible values for the enum as string literals.

java enums

Break or return from Java 8 stream forEach?

To break or return from a Java 8 Stream.forEach() operation, you can use the break or return statements as you would normally do in a loop.

java foreach java-8 lambda

byte[] to file in Java

To write a byte[] to a file in Java, you can use the following code:

java file arrays io inputstream

C# Java HashMap equivalent

In Java, the HashMap class is the equivalent of the Dictionary class in C#. It is a map data structure that stores (key, value) pairs and provides fast lookup and insertion of elements.

java hashmap c#

C++ performance vs. Java/C#

C++ is generally considered to be a faster and more performant language than Java or C#.

java performance c++ c# bytecode

Calculate date/time difference in java

To calculate the difference between two dates in Java, you can use the java.time package (part of Java 8 and later) or the java.util.Calendar class (part of the older java.util package).

java time

Calculating days between two dates with Java

To calculate the number of days between two dates in Java, you can use the Period class from the java.time package introduced in Java 8.

java date-arithmetic

Calendar date to yyyy-MM-dd format in java

To format a Calendar date in the yyyy-MM-dd format in Java, you can use the SimpleDateFormat class.

converter java date calendar