deleted 5 characters in body; edited tags; edited title

edited Jun 29, 2009 at 14:24

what does What does this statement mean??

I am a beginner in Java and do not understand what if(!s.add(a)) means in this code excerpt:

Set<String> s = new HashSet<String>(); for(String a:args) { if(!s.add(a)) System.out.println("Duplicate detected:"+a); }

what does this statement mean??

I am beginner in Java and do not understand what if(!s.add(a)) means in this code excerpt:

Set<String> s = new HashSet<String>(); for(String a:args) { if(!s.add(a)) System.out.println("Duplicate detected:"+a); }

I am a beginner in Java and do not understand what if(!s.add(a)) means in this code excerpt:

Set<String> s = new HashSet<String>(); for(String a:args) { if(!s.add(a)) System.out.println("Duplicate detected:"+a); }

added 8 characters in body; edited tags; added 28 characters in body

edited Jun 29, 2009 at 14:17

I am beginner in Java.I can and do not getunderstand what the **if(!s.add(a))**mean??if(!s.add(a)) means in this code excerpt:

Set<String> s = new HashSet<String>(); for(String a:args) {  if(!s.add(a))   System.out.println("Duplicate detected:"+a); }

I am beginner in Java.I can not get what the **if(!s.add(a))**mean??

Set<String> s = new HashSet<String>(); for(String a:args) if(!s.add(a))  System.out.println("Duplicate detected:"+a);

I am beginner in Java and do not understand what if(!s.add(a)) means in this code excerpt:

Set<String> s = new HashSet<String>(); for(String a:args) {  if(!s.add(a)) System.out.println("Duplicate detected:"+a); }

asked Jun 29, 2009 at 14:16

I am beginner in Java.I can not get what the **if(!s.add(a))**mean??

Set<String> s = new HashSet<String>(); for(String a:args) if(!s.add(a)) System.out.println("Duplicate detected:"+a);