java - Differentiating String/Int User Input -

i having issues trying type code make program distinguish whether user inputs string value or int value. if int value typed in, stored array (named data) printed , tested typing string values (as seen in code below in method go(). using .hasnextint incorrectly? here code:

import java.util.scanner; import java.util.random; import java.text.decimalformat;  public class integerstatistics {    java.util.scanner scan;    // declare storage integers   int[] data;   random random;    // create constructor   public integerstatistics() {     scan = new scanner(system.in);     data = new int[10];     random = new random();    }    private void showmenu() {     system.out.println("menu:");     system.out.println("   p - print list of values");     system.out.println("   s - print statistics values");     system.out.println("   f - fill list random values");     system.out.println("   c - clear list of values");     system.out.println("   h - print out menu");     system.out.println("   x - exit program");   }    private void clearvalues() {     system.out.print("the values: [0");     // empty (zero out) array     int = 1;         while(i < data.length) {       system.out.print(", 0");       i++;     } system.out.println("]");   }    private void filllist() {     data[0] = (random.nextint(26) - 10);     system.out.print("the values: [" + data[0]);     for(int = 1; < data.length; i++) {       data[i] = (random.nextint(26) - 10);       system.out.print(", " + data[i]);     } system.out.println("]");   }    private void printvalues() {     data[0] = 1;     system.out.print("the values: [" + data[0]);     // print values     for(int = 1; < data.length; i++) {       data[i] = + 1;       system.out.print(", " + data[i]);     } system.out.println("]");   }    private void printstats() {     int sum = 0;     int max = data[0];     int min = data[0];     // calculate stat values of array     for(int = 0; < data.length; i++) {       // calculate sum of values       sum += data[i];       // find maximum value in array       if(data[i] > max) {         max = data[i];       // find minumum value in array       } else if(data[i] < min) {         min = data[i];       }      }      // caculate average of values     decimalformat df = new decimalformat("#.000");     double avgvalue = (sum / ((double)data.length));     // print stat values of array     system.out.println("sum of values: " + sum);     system.out.println("maximum value: " + max);     system.out.println("minimum value: " + min);     system.out.printf("average value: " + df.format(avgvalue) + "\n");   }    public void go() {     system.out.println("welcome simple statistics program\n");     string input;     int inputnum = integer.parseint(s);     showmenu();     int index = 0;     {       system.out.print("enter command or integer: ");       input = scan.next();       inputnum = scan.nextint();       if(inputnum.hasnextint()) {         data[index] = input.hasnexint();       } else if(input.equals("p")) {         printvalues();       } else if(input.equals("s")) {         printstats();       } else if(input.equals("f")) {         filllist();       } else if(input.equals("c")) {         clearvalues();       } else if(input.equals("h")) {         showmenu();       } else if(input.equals("x")) {      // nothing       } else {         system.out.println("unrecognized command. try again.");         showmenu();       }     } while( ! input.equals("x"));     system.out.println("\nthank using simple statistics program");   }    public static void main(string[] args) {     new integerstatistics().go();   }  } 

the array created through input of int can partially filled,but must not exceed length of ten integers. let me know clarification needed.

you can define string , try convert integer, if throws numberformatexception because isn't number.