Java Static Members — Free Java Tutorial

TL;DR: Learn Java Static Members in Java with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.

Java Static Members in Java

Static members (fields and methods) belong to the class itself, not to any instance. They are shared across all instances and accessed via the class name: ClassName.field or ClassName.method().

Static fields are useful for constants (static final), counters, and shared state. Static methods are utility methods that do not need instance state.

A utility class is typically a class with only static methods and a private constructor (to prevent instantiation): Math, Arrays, Collections, Objects are all utility classes.

Static initializer blocks run once when the class is loaded, before any constructor: static { ... }. Useful for initialising complex static fields.

class Counter {
    private static int count = 0;  // shared across all instances
    private int id;

    Counter() { this.id = ++count; }

    static int getCount() { return count; }  // static method
    int getId() { return id; }               // instance method
}

// Utility class pattern
final class MathUtils {
    private MathUtils() {}  // prevent instantiation

    static int clamp(int val, int min, int max) {
        return Math.max(min, Math.min(max, val));
    }
}

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