how to delete the map elements when iterating the map

[jing hu]

I want to delete some elements when iterating the map.

Like this.

package pkg;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

public class DeleteMapElements {
    public static void main(String[] args) {
        Map<String, String> map = new HashMap<String, String>();
        map.put("1", "test");
        map.put("2", "test1");
        map.put("3", "test2");
        map.put("4", "test3");

        Iterator<String> iter = map.keySet().iterator();
        while (iter.hasNext()) {
            String str = iter.next();
            if (str.equals("2")) {
                map.remove(str);
            }
        }
    }

}

but it will fail and throw java.util.ConcurrentModificationException. So How can I modify the map when iterating it.
I want to know a convenient method which do not need many codes.
Thanks

[Aurelian Tutuianu]

replace line 19 with:

iter.remove();

[jing hu]

Thanks, I get it.