The helper classes for the java.lang package are:

• Math -- Contains methods for performing basic mathematical operations. Note that all the methods manipulating floating point values are omitted, leaving only the abs(), min(), and max() methods on integers and longs.
  
  
• String -- Represents String objects in Java, as in J2SE.
  
  
• StringBuffer -- Represents a string that can be modified, as in J2SE.