Consult the API documentation to find methods for

• Concatenating two strings, that is, making a string consisting of the first string, followed by the second string.

• Removing leading and trailing white space of a string.

• Converting a rectangle to a string.

• Computing the smallest rectangle that contains two given rectangles.

• Returning a random floating-point number.

For each method, list the class in which it is defined, the return type, the method name, and the types of the arguments.