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Category upJava

Core Java

Learn how to use the basic concepts of the Java language by reading the guides below.

  • Definition (64)
  • Java Keyword (21)
  • Java Constructor (20)
  • Reflection (20)
  • >= Java 8 (19)
  • Java Interfaces (18)
  • Java Operators (16)
  • >= Java 11 (16)
  • Exception (15)
  • Java Loops (13)

>> Introduction to Objenesis

>> What Is an API in Java?

>> Java Naming Conventions

>> Labeled Breaks in Java: Useful Tool or Code Smell?

>> What Is the Difference Between JDK_JAVA_OPTIONS and JAVA_TOOL_OPTIONS?

>> Resolving ClassCastException: Ljava.lang.Object; cannot be cast to Ljava.lang.Integer

>> Using Greater-Than-Or-Equal-to in a Switch Statement in Java

>> Execute a JAR File From a Java Program

>> How to Run a Class Within a WAR File Using the Command Line

>> Why super.super.method() is Not Allowed in Java

>> Fix The Compile Error: class X is public should be declared in a file named X.java

>> Guide to Objects.requireNonNull() in Java

>> How to Diagnose a Null Exception Message in Java

>> How to Check if Two Boolean Values Are Equal

>> Conversion from POJO to Avro Record

>> Get Classpath From ClassLoader in Java

>> Reduce Memory Footprint in Java

>> What’s the Difference Between interface and @interface in Java?

>> Implicitly Declared Classes and Instance Main Methods in Java

>> Calling getClass() From a Static Context

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