Try It Yourself - SyntaxStudy Editor

HTML / CSS / JS

import java.util.HashMap;
import java.util.Map;
import java.util.Objects;

public class ObjectMethods {

static class Point {
        private final int x;
        private final int y;

Point(int x, int y) { this.x = x; this.y = y; }

public int getX() { return x; }
        public int getY() { return y; }

@Override
        public boolean equals(Object o) {
            if (this == o) return true;             // same reference
            if (!(o instanceof Point)) return false; // null or wrong type
            Point other = (Point) o;
            return x == other.x && y == other.y;
        }

@Override
        public int hashCode() {
            return Objects.hash(x, y);  // consistent with equals
        }

@Override
        public String toString() {
            return "Point(" + x + ", " + y + ")";
        }
    }

public static void main(String[] args) {
        Point p1 = new Point(3, 4);
        Point p2 = new Point(3, 4);
        Point p3 = new Point(1, 2);

// Reference equality vs value equality
        System.out.println("p1 == p2      : " + (p1 == p2));       // false
        System.out.println("p1.equals(p2) : " + p1.equals(p2));    // true
        System.out.println("p1.equals(p3) : " + p1.equals(p3));    // false
        System.out.println("p1.equals(null): " + p1.equals(null)); // false

// hashCode consistency
        System.out.println("p1.hashCode() == p2.hashCode(): "
            + (p1.hashCode() == p2.hashCode()));  // true

// HashMap relies on correct equals/hashCode
        Map<Point, String> map = new HashMap<>();
        map.put(p1, "origin-ish");
        System.out.println("map.get(p2): " + map.get(p2)); // "origin-ish"

// toString
        System.out.println(p1);       // Point(3, 4)

// Java 16+ record for comparison
        // record PointRecord(int x, int y) {}
        // auto-generates equals, hashCode, toString, accessors
    }
}