Schlagwort: for

How to use Iterator, for and foreach-loop in Java

Here is a very good example on how to use the Iterator, for and foreach-loop in Java:

import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
 
public class JavaApplication {
 
  public static void main(String[] args) throws IOException {
    List<String> names = new ArrayList<>();
    names.add("Benny");
    names.add("Sarah");
    names.add("Daniel");
    names.add("Maria");
 
    // Iterator
    Iterator<String> iterator = names.iterator();
    while (iterator.hasNext()) {
      System.out.println(iterator.next());
    }
 
    // for
    for (int i = 0; i < names.size(); i++) {
      System.out.println(names.get(i));
    }
 
    // foreach
    for (String name : names) {
      System.out.println(name);
    }
  }
}

For and foreach loop example in Java

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public static void main(String[] args)
{
  String[] firstNames =
  {
    "Marge", "Homer", "Lisa", "Bart", "Maggie"
  };
 
  System.out.println("- With for loop:");
 
  for (int i = 0; i < firstNames.length; i++)
  {
    System.out.println(firstNames[i]);
  }
 
  System.out.println("- With foreach loop");
 
  for (String name : firstNames)
  {
    System.out.println(name);
  }
}