for(Object name : collection type)

[Balaji Sampath]

Hi there
I came across this snippet and taught if you can give me some details for the below "for" loop:

for(Object name : v){
System.out.println(name);
}
say v is a vector. This type is used mainly in fileI/o Streams.
how exactly the loop is executed.

Thanks in advance
Balaji.S

[marc weber]

The "enhanced for" loop is new with Java 5.0. Basically, for(Object name : v) means for each Object in v (where "name" is a variable referencing the object of that iteration).

This saves you the trouble of writing index code, like for(int x = 0; x < v.size(); x++), and then pulling out the element with something like v.get(x).

import java.util.Vector;
 
class EnhancedFor {
  public static void main(String[] args) {
    Vector<String> v = new Vector<String>();
    v.add("abc");
    v.add("def");
    v.add("ghi");
 
    System.out.println("Regular for loop...");
    for(int x = 0; x < v.size(); x++) {
      System.out.println((String)v.get(x));
    }
 
    System.out.println("Enhanced for loop...");
    for(String str : v){
      System.out.println(str);
    }
  }
}

[Balaji Sampath]

Kudos !! for the explanation..
Thanks
Balaji.S