Export database schema and contents

How can I export my database in sql statements, so that I can create/load
the same schema and contents on a different database, the result should be
something like

CREATE TABLE Animal (
 ID NUMBER(6) PRIMARY KEY,
 name VARCHAR2(20) UNIQUE,
 legs NUMBER(3),
 insertionDate DATE);

CREATE SEQUENCE AnimalIDs;

INSERT INTO Animal VALUES(AnimalIDS.NEXTVAL, 'cow', 4, SYSDATE);
INSERT INTO Animal VALUES(AnimalIDS.NEXTVAL, 'tiger', 4, SYSDATE);
INSERT INTO Animal VALUES(AnimalIDS.NEXTVAL, 'spider', 8, SYSDATE);