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Found 119 results for "Core Java"

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Data Types in Java Primitive Wrapper

Data types define what kind of value a variable can store and what operations Java allows on that value.

https://www.tutorialslogic.com/core-java/data-types

Encapsulation in Java Access Modifiers

Protect Java object invariants with private state, validated construction, focused methods, and the narrowest access level that callers genuinely need.

https://www.tutorialslogic.com/core-java/encapsulation

Generics in Java Generic Classes Methods

Write type-safe Java APIs with generic classes and methods, bounds, wildcards, variance rules, and deliberate avoidance of raw types.

https://www.tutorialslogic.com/core-java/generics

IllegalArgumentException in Java: Causes and Fixes

Learn when Java throws IllegalArgumentException, how to trace the invalid value, choose the correct exception type, and enforce method contracts with clear validation.

https://www.tutorialslogic.com/core-java/errors/illegal-argument-exception

Inheritance in Java extends, super, Override

Use Java inheritance for genuine is-a relationships, then apply super, overriding, protected access, substitutability, and composition tradeoffs.

https://www.tutorialslogic.com/core-java/inheritance

Java 8 Features Lambda, Streams, Optional

Java 8 features should connect lambda expressions, functional interfaces, streams, Optional, default methods, and method references with practical collection processing.

https://www.tutorialslogic.com/core-java/java-8-features

Java NoSuchMethodError: Causes, Dependency Conflict and Fix

Fix java.lang.NoSuchMethodError by finding the runtime JAR conflict, comparing method signatures, aligning Maven or Gradle versions, and rebuilding cleanly.

https://www.tutorialslogic.com/core-java/errors/no-such-method-error

Loops in Java for, while, do while

Trace Java for, while, do-while, and enhanced for loops through initialization, continuation, update, termination, and collection boundaries.

https://www.tutorialslogic.com/core-java/loops

Methods in Java Declaration, Overloading, Recursion

Define Java methods with typed parameters and return values, distinguish static from instance behavior, overload deliberately, and keep recursive calls bounded.

https://www.tutorialslogic.com/core-java/methods

NumberFormatException in Java: Causes and Safe Parsing Fixes

Fix Java NumberFormatException from empty strings, spaces, decimals, invalid input, and overflow using trim, try-catch, Optional, BigDecimal, and validation.

https://www.tutorialslogic.com/core-java/errors/number-format-exception

OOP Basics in Java Classes, Objects, Constructors

Connect Java classes, objects, fields, constructors, methods, encapsulation, and object state through a small domain model.

https://www.tutorialslogic.com/core-java/oop-basics

Operators in Java Arithmetic, Logical, Bitwise

Use Java arithmetic, comparison, logical, assignment, unary, bitwise, and ternary operators with deliberate precedence and short-circuit behavior.

https://www.tutorialslogic.com/core-java/operators

Packages in Java Import Built in Packages

Organize Java classes with package declarations, imports, qualified names, access rules, and build-friendly directory structure.

https://www.tutorialslogic.com/core-java/packages

Polymorphism in Java Overloading Overriding

Distinguish compile-time overloading from runtime overriding, and trace how declared and runtime types select Java behavior.

https://www.tutorialslogic.com/core-java/polymorphism

Strings in Java Methods, StringBuilder, Format

Work with immutable Java String values, compare content correctly, build repeated text with StringBuilder, format output, and handle null boundaries.

https://www.tutorialslogic.com/core-java/strings

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