Static Members & Utility Classes — Free Java Tutorial

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

Static Members & Utility Classes 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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