How-to articles, tricks, and solutions about JAVA

You can use the map and collect methods of the Stream class to achieve this.

To use two values in a switch case statement in Java, you can use the case label for each value, or you can use the case label with a range of values.

To convert a byte array to a string in UTF-8 encoding, you can use the following method in Java:

If you are getting the "variable might not have been initialized" error in Java, it means that you are trying to use a local variable that has not been assigned a value.

To view the contents of a .jar file, you can use the jar command-line utility that is included with the Java Development Kit (JDK).

In Selenium, you can use the WebDriverWait class to wait for a page to load.

If you are getting a warning about an SSL connection when connecting to a MySQL database, it may be because you are using an older version of the MySQL client library that does not support SSL connections by default.

To get the number of digits in an int in Java, you can use the log10() method of the Math class and then add 1 to the result.

There are several ways to iterate over a List in Java. Here are some of the most common approaches:

In Java, you can create an object in the following ways:

In Java, an escape character is a character that is preceded by a backslash (\) and is used to represent special characters or character sequences.

To allow the Java Virtual Machine (JVM) to be remotely debugged, you can use the following command line options:

The -Xms and -Xmx options are used to set the initial and maximum heap sizes, respectively, for the Java Virtual Machine (JVM).

There are several differences between a HashMap and a Hashtable in Java:Synchronization: Hashtable is synchronized, while HashMap is not.

The hbm2ddl.auto configuration property in Hibernate determines the mode in which Hibernate should operate when it comes to generating the database schema. The possible values for this property are:

java.lang.ArrayIndexOutOfBoundsException is an exception that is thrown when you try to access an element of an array with an index that is out of bounds. This can happen if you try to access an index that is either negative or greater than or equal to

The javac compiler may issue the "uses unchecked or unsafe operations" warning if your code uses operations that may result in an Unchecked warning at runtime.

The java.lang.reflect.InvocationTargetException is a checked exception that is thrown when an exception is thrown by an invoked method or constructor.

In Java, the three dots (...) next to a parameter type indicate that the parameter is a varargs parameter.

In Java, the synchronized keyword is used to provide mutually exclusive access to a shared resource. When a thread tries to execute a synchronized block of code, it will first acquire a lock on the object that the code is synchronized on. If another threa

"Could not find or load main class" is an error message shown when a Java program is run, but the main class cannot be found or loaded.

The strings "%5B" and "%5D" are URL-encoded versions of the square brackets "[" and "]", respectively.

A "Cannot find symbol" or "Cannot resolve symbol" error in Java means that the compiler cannot find a symbol (such as a class, method, or variable) that it needs to complete the compilation. This can happen for a variety of reasons, including:

In a class, the static keyword is used to declare a static member, which belongs to the class itself rather than an instance of the class. This means that you can access a static member without creating an instance of the class.

The assert keyword in Java is used to define an assertion, which is a statement that you expect to be true at a specific point in your program. If the assertion is not true, then the program will throw an AssertionError.