问如何打印包含int的字符串

EN

import java.util.Scanner;

public class SolveX{

    public static void main(String[] a){

        Scanner in = new Scanner(System.in);
        System.out.println("Write an equation and I will solve for x.");
        String input = "";

        while( in.hasNext() ){
            input = in.next();
            try{  
                double d = Double.parseDouble(input);
                System.out.println("Double found at: " + input);
                //  Do what you need to with the numeric value
            }  
            catch(NumberFormatException nfe){
                System.out.println("No double found at: " + input);
              //    Do what you need to with the non numeric value 
            }
        }
    }//end main
}//end SolveX class