implements scheme's cons in java

Cons.java

/**
 * Cons
 *
 * @author yanganyu
 * @date 2019/11/12 23:57
 */
public class Cons<L, R> {
    private L left;
    private R right;

    public Cons() {
    }

    public Cons(L left, R right) {
        this.left = left;
        this.right = right;
    }

    /**
     * get the left element
     *
     * @return the left element
     */
    public L car() {
        return this.left;
    }

    /**
     * get the right element
     *
     * @return the right element
     */
    public R cdr() {
        return this.right;
    }

    public void setLeft(L left) {
        this.left = left;
    }

    public void setRight(R right) {
        this.right = right;
    }
}