import type { JavaIterable } from '../../java/lang/JavaIterable';
import type { JavaIterator } from './JavaIterator';
export interface Collection<E> extends JavaIterable<E> {
    size(): number;
    isEmpty(): boolean;
    contains(o: any): boolean;
    [Symbol.iterator](): Iterator<E>;
    iterator(): JavaIterator<E>;
    toArray(): Array<unknown>;
    toArray<U>(a: Array<U>): Array<U>;
    add(e: E | null): boolean;
    remove(o: any): boolean;
    containsAll(c: Collection<any> | null): boolean;
    addAll(c: Collection<E> | null): boolean;
    removeAll(c: Collection<any> | null): boolean;
    retainAll(c: Collection<any> | null): boolean;
    clear(): void;
    equals(obj: any): boolean;
    hashCode(): number;
}
export declare function cast_java_util_Collection<E>(obj: unknown): Collection<E>;
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