Using the API Worksheet



Object Methods vs Class (Static) Methods (API)

Created by: Barb Ericson

Georgia Institute of Technology

1. Use the API for the String class (java.lang.String) to answer the following:

a. How would you find the first position in a string of another string?

b. How would you find the last position in a string of another string?

c. How would you remove leading and trailing spaces from a string?

d. How do you get the number of characters in a string?

e. How do you convert a string to lowercase letters?

f. How can you tell if two strings have the same characters?

g. How can you convert a number to a string?

2. Use the API for the Math class (java.lang.Math) to answer the following:

a. How can you use the Math class to calculate 2 to the 10th power?

b. How can you use the Math class to find the square root of a number?

c. How can you use the Math class to round a decimal number?

d. Are there any methods in the Math class that aren’t class methods?

3. Use the API for the Integer class (java.lang.Integer) to answer the following:

a. What method can you use to convert a string to an integer value?

b. What happens if you try to convert a string that doesn’t contain a number?

c. Are there any methods in the Integer class that aren’t class methods?

4. Use the API for the Double class (java.lang.Double) to answer the following:

a. What method can you use to convert a string to a double value?

b. What happens if you to convert a string that doesn’t contain a valid decimal?

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