Moving between Windows in selenium

Upon clicking let us assume that a new window page is displayed

public void stringhandles(){

1. Set<String>handles = driver.getWindowHandles();
2. System.out.println("popopopo"+handles.size());
3. System.out.println("popopopo"+handles);
5. for(String handle:handles){
6. for(i=0;i<handles.size();i++){
7. System.out.println( i);
8. if(i==0){
9. continue;
10. }
12. }
13. driver.switchTo().window(handle);
14. }

}