hi, A keyword is a specially assigned word which can be used in programming like if,while,etc. whereas a reserved word is a keyword which is kept reserved so that it cannot be used during normal programming like goto,strictfp,widefp,etc. Dont worry the exam only asks u to find which are java keywords i.e. java keywords and java reserved words. hope this helps, sushant.
Java unitll know has 48 words which are reserved for the usage in the language syntax which are referred to has keywords and hence u cant use them as user defined variables. Java has some keywords which are untill now not used as keywords that is they r reserved for future use. They r referred to as reserved words. hence reserved words r java keywords for future reference. -mohan