src/java.base/share/classes/java/lang/RuntimeException.java

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 * accompanied this code).
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package java.lang;

/**
 * {@code RuntimeException} is the superclass of those
 * exceptions that can be thrown during the normal operation of the
 * Java Virtual Machine.
 *
 * <p>{@code RuntimeException} and its subclasses are <em>unchecked
 * exceptions</em>.  Unchecked exceptions do <em>not</em> need to be
 * declared in a method or constructor's {@code throws} clause if they
 * can be thrown by the execution of the method or constructor and
 * propagate outside the method or constructor boundary.
 *
 * @author  Frank Yellin
 * @jls 11.2 Compile-Time Checking of Exceptions
 * @since   1.0
 */
public class RuntimeException extends Exception {
    @java.io.Serial
    static final long serialVersionUID = -7034897190745766939L;

    /** Constructs a new runtime exception with {@code null} as its
     * detail message.  The cause is not initialized, and may subsequently be
     * initialized by a call to {@link #initCause}.
     */
    public RuntimeException() {
        super();
    }

    /** Constructs a new runtime exception with the specified detail message.
     * The cause is not initialized, and may subsequently be initialized by a
     * call to {@link #initCause}.
     *
     * @param   message   the detail message. The detail message is saved for
     *          later retrieval by the {@link #getMessage()} method.
     */
    public RuntimeException(String message) {
        super(message);
    }

    /**
     * Constructs a new runtime exception with the specified detail message and
     * cause.  <p>Note that the detail message associated with
     * {@code cause} is <i>not</i> automatically incorporated in
     * this runtime exception's detail message.
     *
     * @param  message the detail message (which is saved for later retrieval
     *         by the {@link #getMessage()} method).
     * @param  cause the cause (which is saved for later retrieval by the
     *         {@link #getCause()} method).  (A {@code null} value is
     *         permitted, and indicates that the cause is nonexistent or
     *         unknown.)
     * @since  1.4
     */
    public RuntimeException(String message, Throwable cause) {
        super(message, cause);
    }

    /** Constructs a new runtime exception with the specified cause and a
     * detail message of {@code (cause==null ? null : cause.toString())}
     * (which typically contains the class and detail message of
     * {@code cause}).  This constructor is useful for runtime exceptions
     * that are little more than wrappers for other throwables.
     *
     * @param  cause the cause (which is saved for later retrieval by the
     *         {@link #getCause()} method).  (A {@code null} value is
     *         permitted, and indicates that the cause is nonexistent or
     *         unknown.)
     * @since  1.4
     */
    public RuntimeException(Throwable cause) {
        super(cause);
    }

    /**
     * Constructs a new runtime exception with the specified detail
     * message, cause, suppression enabled or disabled, and writable
     * stack trace enabled or disabled.
     *
     * @param  message the detail message.
     * @param cause the cause.  (A {@code null} value is permitted,
     * and indicates that the cause is nonexistent or unknown.)
     * @param enableSuppression whether or not suppression is enabled
     *                          or disabled
     * @param writableStackTrace whether or not the stack trace should
     *                           be writable
     *
     * @since 1.7
     */
    protected RuntimeException(String message, Throwable cause,
                               boolean enableSuppression,
                               boolean writableStackTrace) {
        super(message, cause, enableSuppression, writableStackTrace);
    }
}