Vector

[ŖàΫ ỏƒ Ңόρę]

Hi

I wrote the following program as an example of vector

When I run the program and enter 'stop', it doesn't stop

import java.util.Vector;
import java.util.Scanner;

public class TryVector {
	public static void main(String[] args){
		
		Scanner scan = new Scanner(System.in);
		Vector<String> v = new Vector<String>() ;
		
		String name="";
		
		while(name != "stop"){
		v.add(name);
		System.out.println("Add name");
		name = scan.next();
		}
		
		//print
		
		for(int i=0; i<v.size(); i++){
			v.get(i);
		}
	}
}

I've tried many times to figure out the problem but I couldn't

[m00nchile]

Object comparison should always be done with the equals() method, the == operator is used for primitive types, and memory locations of object instances.
Swap out while(name != "stop) with while(!name.equals("stop")) and you'll be fine.
And one more thing:

for(int i = 0; i < v.size(); i++)
  v.get(i);

This doesn't acomplish anything, you just get the value from the vector, but you don't store it anywhere, or do anything with it. Maybe you wanted a System.out.println() there?

[JosAH]

Object comparison should always be done with the equals() method, the == operator is used for primitive types, and memory locations of object instances.

The OP asked a similar question here. Strange he forgot how to do it right ...

kind regards,

Jos