Who can tell me which mistake i made?

Question

This is the codes
import java.util.Scanner;

public class Program
{
public static void main(String[ ] args) {
String input1 = new Scanner(System.in).nextLine();
String input2 = new Scanner(System.in).nextLine();
if (input1 == piaoyi){
System.out.println("smart");}
else if (input2 == xujun){
System.out.println("stupid");}
}
}

Answer 1

/*you only need to create one object of Class Scanner*/

Scanner sc = new Scanner(System.in);

String str1 = sc.nextLine();
String str2 = sc.nextLine();

if(str1.equals(str2)){/*doSomthing*/}
else{/*doSomthingElseIfNotEqual*/};

System.out.print(str1+"\n"+str2);

Answer 2

piaoyi and xujun look like variable names, but they haven't been defined. Did you mean to write them as strings for comparison? wrap them in " " and the code will compile.

Also in Java you should compare strings with .equals() rather than == e.g.
"myString".equals("anotherString")

Answer 3

Like Dan Walker said you should use the method equals() to test for the actual value with objects, because when you use == you're only testing if both objects have the same reference.

Answer 4

Plz,come one to help me

Answer 5

Maybe try this:
if (input1 == "piaoyi"){...}
and
else if (input2 == "xujun"){...}

If it doesn't work, try this:
if (input1.equals("piaoyi")){...}
and
if (input2.equals("xujun")){...}

Answer 6

Thanks,guys.