1. Why should you use StringBuilder objects instead of String objects in a program that makes lots of changes to strings? 2. A program reads a string as input from the user for the purpose of...

1. Why should you use StringBuilder objects instead of String objects in a program that makes lots of changes to strings?

2. A program reads a string as input from the user for the purpose of tokenizing it. Why is it a good idea to trim the string before tokenizing it?

3. Each of the numeric wrapper classes has a static toString method. What do these methods do?

4. How can you determine the minimum and maximum values that may be stored in a variable of a given data type?