Using Java.util.scanner with command prompt -

i'm trying program run solely out of command line (command prompt in case) when create .jar keep getting error:

expception in thread "main" java.lang.unsupportedclassversionerror: exponentiation: unsupported major.minor version 51.0     @ java.lang.classloader.defineclass1(native method)     @ java.lang.classloader.defineclasscond(unknown source)     @ java.lang.classloader.defineclass(unknown source)     @ java.security.secureclassloader.defineclass(unknown source)     @ java.net.urlclassloader.defineclass(unknown source)     @ java.net.urlclassloader.access$000(unknown source)     @ java.net.urlclassloader$1.run(unknown source)     @ java.security.accesscontroller.doprivileged(native method)     @ java.net.urlclassloader.findclass(unknown source)     @ java.lang.classloader.loadclass(unknown source)     @ sun.misc.launcher$appclassloader.loadclass(unknown source)     @ java.lang.classloader.loadclass(unknown source) not find main class: exponentiation. program exit. 

the program is:

//import scanner user input import java.util.scanner;  public class exponentiation {  static long values[]; //array of values computed static long output[]; //array of computed values static int numberexp; //number times experiment run static int currentexp = 1; //current time experiment running  //main method public static void main(string [] args) {     //run initial setup , random generating     setup();      //run interative , recursive components until user specified number of experiments     (currentexp = 1; currentexp <= numberexp; currentexp++)     {         iterative();         recursive();     }  } //close main method  //runs trail iteratively public static void iterative() {     //create variables time     long initialtime;     long endtime;     long difftime;      //record initial time     initialtime = system.nanotime();      //for every value exponetiate     (int counter = 1; counter <= values[0]; counter++)     {         //raise every value opposing value in array         output[counter] = values[counter]^values[(int)values[0] + 1 - counter];     }      //recourd end time     endtime = system.nanotime();      //calculate difference     difftime = endtime - initialtime;      //output time values     system.out.println();     system.out.println("experiment " + currentexp + " iterative:");     system.out.println(initialtime);     system.out.println(endtime);     system.out.println(difftime); } //close iterative method  //runs trial recursively public static void recursive() {     //create variables time     long initialtime;     long endtime;     long difftime;      //record initial time     initialtime = system.nanotime();      //for every value exponetiate     (int counter = 1; counter <= values[0]; counter++)     {         //raise every value opposing value in array using recursive method         output[counter] = recursiveexpo(values[counter],values[(int)values[0] + 1 - counter]);     }      //recourd end time     endtime = system.nanotime();      //calculate difference     difftime = endtime - initialtime;      //output time values     system.out.println();     system.out.println("experiment " + currentexp + " recursive:");     system.out.println(initialtime);     system.out.println(endtime);     system.out.println(difftime); }  //close recursive method  public static long recursiveexpo(long base, long expo) {     if (expo == 0) {         return 1;     } else {         return base * recursiveexpo(base, expo - 1);     } } //close recursiveexpo  //setup method - runs setup isolated main program public static void setup() {      int lowrange; //lowest possible random value     int highrange; //highest possible random value     int numoftrials; //number of trials/random numbers generated      //create scanner user input     scanner input = new scanner( system.in );      //runs random number generator until assortment found     (boolean goodrandom = false; goodrandom == false;)     {          //clear values[], in case         values = null;          system.out.println("this program iterative exponetiation");         system.out.println("enter prefered range of numbers");          system.out.println("lowest possible number");         lowrange = input.nextint(); //store min random number          system.out.println("highest possible number");         highrange = input.nextint(); //store max random number          system.out.println("number of trials");         numoftrials = input.nextint(); //store number of trials          system.out.println("how many times should experiment run?");         numberexp = input.nextint(); //store number of experiments          //create array of correct size , store size in 0th element         values = new long[numoftrials+1];         values[0] = numoftrials;          //make output array same lenght         output = new long[numoftrials+1];          //generate random values each element until numoftrials reached         (int counter = 1; counter <= numoftrials; counter++)         {             values[counter] = (int)(math.random()*(highrange)) + lowrange;         }          //create output , concatinate numbers         (int counter = 0; counter <= values[0]; counter++)         {             //add line break every tenth number             //and output values[]             if ((int)(counter/10) == (((double)counter)/10))             {                 system.out.println(values[counter] + " ");             } else {                 system.out.print(values[counter] + " ");             }          }          system.out.println("enter 1 use these values or 0 new ones");          //regenerate or not?         if (input.nextint() == 1)         {             goodrandom = true; //continue on actual test         }      } //close number-generator loop  } //close setup method  } //close expo class 

i think i'm doing wrong scanner, i'm not sure what.

while youre compiling code jdk 7+ youre running using java <=6. if here you'll see 51.0 java 7, , th fact unsupported means java on classpath older.

try running java -version on command line verify, , fix path