Builder pattern sample code

builder-pattern-sample.java

public final class Coordinate {
    final int x;
    final int y;

    public static Builder builder() {
        return new Builder();
    }

    private Coordinate(Builder builder) {
        this.x = builder.x;
        this.y = builder.y;
    }

    public int getX() {
        return x;
    }

    public int getY() {
        return y;
    }
    
    public static final class Builder {
        int x;
        int y;

        private Builder() {

        }

        public Builder setX(int x) {
            this.x = x;
            return this;
        }

        public Builder setY(int y) {
            this.y = y;
            return this;
        }

        public Coordinate build() {
            return new Coordinate(this);
        }
    }
}