Java™ Application Development on Linux - Dator

3.2 Fundamental Language Elements73This is the new syntax that tells the compiler that we are putting Strings intothe List. The compiler will enforce that and give a compile time error if wetry to add any other type to the List.Now we come to the for loop. Read it as “for str in loa” or “for Stringvalues of str iterating over loa.” We will get an iterator working out of sightthat will iterate over the values of loa, our List. The values (the result of thenext() method) will be put in the String variable str. So we can use strinside the body of the loop, with it taking on successive values from thecollection.Let’s describe the syntax, then, asfor ( SomeType variable : SomeCollectionVariable ) {}which will define variable to be of type SomeType and then iterate over theSomeCollectionVariable. Each iteration will execute the body of the loop,with the variable set to the next() value from the iterator. If the collection isempty, the body of the loop will not be executed.This variation of the for loop works for arrays as well as for these newtyped collections. The syntax for arrays is the same. Example 3.16 will echo thearguments on the command line, but without loading up a List like we didin our previous example.Example 3.16 A for loop iterator for arraysimport java.util.*;public classForn{public static voidmain(String [] args){for(String str : args) {System.out.println("arg="+str);}} // main} // Forn