Method checkState

guava/src/com/google/common/base/Preconditions.java:516–520

Ensures the truth of an expression involving the state of the calling instance, but not involving any parameters to the calling method. @param expression a boolean expression @throws IllegalStateException if {@code expression} is false @see Verify#verify Verify.verify()

(boolean expression)

   * @see Verify#verify Verify.verify()
   */
  public static void checkState(boolean expression) {
    if (!expression) {
      throw new IllegalStateException();
    }
  }

  /**
   * Ensures the truth of an expression involving the state of the calling instance, but not