{"id":19145,"date":"2015-01-30T11:00:42","date_gmt":"2015-01-30T09:00:42","guid":{"rendered":"http:\/\/examples.javacodegeeks.com\/?p=19145"},"modified":"2020-08-10T10:31:13","modified_gmt":"2020-08-10T07:31:13","slug":"java-lang-iterable-interface-example","status":"publish","type":"post","link":"https:\/\/examples.javacodegeeks.com\/iterable-java-example-java-lang-iterable-interface\/","title":{"rendered":"Iterable Java Example – java.lang.Iterable Interface"},"content":{"rendered":"

This article shows an Iterable Java example – java.lang.Iterable interface. This is defined in java.lang<\/a><\/code> package and was introduced with Java 5. The Iterable<\/code> is defined as a generic type; Iterable<T><\/code>, where T type parameter represents the type of elements returned by the iterator.<\/p>\n

An object that implements this interface allows it to be the target of the “foreach” statement. The for-each loop is used for iterating over arrays, collections etc. Collection classes and classes where iterations are useful implement this interface.<\/p>\n

Before the iterable’s for-each loop was introduced, a way to iterate is to use the for(;;) loop or to use an Iterator<\/a><\/code>; typically the Iterator<\/code> could be acquired by invoking a collection object’s iterator()<\/code> method. The iterator has been in Java since Java 1.2.<\/p>\n

The Iterable<\/code> interface provides a clean approach to coding the iteration functionality. An example shows iterating over a List<\/a><\/code> collection with String<\/a><\/code> object elements:<\/p>\n

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1<\/div>\n
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4<\/div>\n<\/td>\n
\n
\n
List<String> stringList = <\/code>new<\/code> ArrayList<>();<\/code><\/div>\n
stringList.add(<\/code>\"a\"<\/code>);<\/code><\/div>\n
stringList.add(<\/code>\"b\"<\/code>);<\/code><\/div>\n
stringList.add(<\/code>\"c\"<\/code>);<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
\n
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1<\/div>\n
2<\/div>\n
3<\/div>\n
4<\/div>\n<\/td>\n
\n
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for<\/code> (String s : stringList) {<\/code><\/div>\n
 <\/div>\n
    <\/code>System.out.println(s);<\/code><\/div>\n
}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

The above for-each code is much cleaner and elegant than the following two code snippets which have the same functionality. The following code use the for(;;) loop and the Iterator<\/code> respectively.<\/p>\n

\n
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1<\/div>\n
2<\/div>\n
3<\/div>\n
4<\/div>\n<\/td>\n
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for<\/code> (<\/code>int<\/code> i = <\/code>0<\/code>; i < stringList.size(); i++) {<\/code><\/div>\n
 <\/div>\n
    <\/code>System.out.println(stringList [i]);<\/code><\/div>\n
}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
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1<\/div>\n
2<\/div>\n
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6<\/div>\n<\/td>\n
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Iterator<String> iter = stringList.iterator();<\/code><\/div>\n
 <\/div>\n
while<\/code> (iter.hasNext()) {<\/code><\/div>\n
 <\/div>\n
    <\/code>System.out.println(iter.next());<\/code><\/div>\n
}<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Note that there is also a possibility of introducing a bug in the above two code snippets, because of the details.

<\/div> <\/div><\/p>\n

1. Iterable Java Example<\/h2>\n

The following example class implements the Iterable<\/code> interface. The class takes an input array of any type and iterates it in a for-each loop and in reverse order.<\/p>\n

The Iterable<\/code> interface has one method to override: Iterator<T> iterator()<\/code>.<\/p>\n

The example has the iterable implementation MyIterable.java<\/code> and a tester class MyIterableTester.java<\/code>. The example code requires Java SE 5 or greater.<\/p>\n

MyIterable<\/code> Class example is shown in the code below:<\/p>\n

MyIterable <\/em><\/span><\/p>\n

import java.util.List;\nimport java.util.Arrays;\nimport java.util.Iterator;\nimport java.util.Collections;\n \npublic class MyIterable implements Iterable {\n \n    private List list;\n \n    public MyIterable(T [] t) {\n \n        list = Arrays.asList(t);\n        Collections.reverse(list);\n    }\n \n    @Override\n    public Iterator iterator() {\n \n        return list.iterator();\n    }\n}\n<\/pre>\n
MyIterableTester<\/code> Class example is shown in the code below:<\/p>\n
\n
import java.util.List;\nimport java.util.Arrays;\nimport java.util.Iterator;\nimport java.util.Collections;\n \nclass MyIterable<T> implements Iterable<T> {\n \n    private List<T> list;\n \n    public MyIterable(T [] t) {\n \n        list = Arrays.asList(t);\n        Collections.reverse(list);\n    }\n \n    @Override\n    public Iterator<T> iterator() {\n \n        return list.iterator();\n    }\n}\npublic class MyIterableTester {\n \n    public static void main(String [] args) {\n \n        Integer [] ints = {1, 2, 3};\n \n        MyIterable<Integer> myList = new MyIterable<>(ints);\n \n        for (Integer i : myList) {\n \n            System.out.println(i);\n        }\n    }\n}\n<\/pre>\n<\/div>\n
The code above when executed will output as:<\/p>\n
MyIterableTester<\/em><\/span><\/p>\n
3\n2\n1\n<\/pre>\n
2. Custom Iterable Data Structure<\/h2>\n
Let us look at building a custom iterable data structure.  First, we will look at Employee<\/code> Class. The Employee<\/code> class has attributes firstName<\/code>,lastName<\/code>, and employeeId<\/code>. The Employee<\/code> class code is implemented as below:<\/p>\n
Employee Class<\/em><\/span><\/p>\n
import static java.lang.String.format;\nimport java.util.*;\n\npublic class Employee {\n   private String firstName, lastName;\n   private int employeeId;\n   public Employee(){ }\n   public Employee(String firstName, String lastName, int employeeId) {\n      this.firstName = firstName;\n      this.lastName = lastName;\n      this.employeeId = employeeId;\n   }\n   public String getFirstName() {\n      return firstName;\n   }\n   public String getLastName() {\n      return lastName;\n   }\n   public int getEmployeeId() {\n      return employeeId;\n   }\n   public void setFirstName(String firstName) {\n      this.firstName = firstName;\n   }\n   public void setLastName(String lastName) {\n      this.lastName = lastName;\n   }\n   public void setEmployeeId(int employeeId) {\n      this.employeeId = employeeId;\n   }\n   @Override\n   public String toString() {\n      return format(\"First Name: %s Last Name: %s EmployeeId: %d\", firstName, lastName, employeeId);\n   }\n}\n<\/pre>\n
Now let us look at EmployeeArrayList<\/code>  implementation which implements the Iterator<\/code> interface. The iterator method is overridden to return the employees<\/code> arrayList iterator.<\/p>\n
\n
import static java.lang.String.format;\nimport java.util.*;\n\nclass Employee {\n   private String firstName, lastName;\n   private int employeeId;\n   public Employee(){ }\n   public Employee(String firstName, String lastName, int employeeId) {\n      this.firstName = firstName;\n      this.lastName = lastName;\n      this.employeeId = employeeId;\n   }\n   public String getFirstName() {\n      return firstName;\n   }\n   public String getLastName() {\n      return lastName;\n   }\n   public int getEmployeeId() {\n      return employeeId;\n   }\n   public void setFirstName(String firstName) {\n      this.firstName = firstName;\n   }\n   public void setLastName(String lastName) {\n      this.lastName = lastName;\n   }\n   public void setEmployeeId(int employeeId) {\n      this.employeeId = employeeId;\n   }\n   @Override\n   public String toString() {\n      return format("First Name: %s Last Name: %s EmployeeId: %d", firstName, lastName, employeeId);\n   }\n}\n\nclass EmployeeArrayList implements Iterable<Employee> {\n   private List<Employee> employees;\n  \n   public EmployeeArrayList() {\n      employees = new ArrayList<Employee>();\n   }\n   public EmployeeArrayList(int employeeId) {\n      employees = new ArrayList<Employee>(employeeId);\n   }\n   public void addEmployee(Employee employee) {\n      employees.add(employee);\n   }\n   public void removeEmployee(Employee employee) {\n      employees.remove(employee);\n   }\n   public int employeesListSize() {\n      return employees.size();\n   }\n   @Override\n   public Iterator<Employee> iterator() {\n      return employees.iterator();\n   }\n\n}\n \npublic class EmployeeArrayListTester {\n   public static void main(String[] args) {\n      Employee emp1 = new Employee("John", "Smith", 21);\n      Employee emp2 = new Employee("George","Smith", 41);\n      EmployeeArrayList empList = new EmployeeArrayList();\n      empList.addEmployee(emp1);\n      empList.addEmployee(emp2);\n      for (Employee emp : empList) {\n         System.out.println(emp);\n      }\n   }\n}<\/pre>\n<\/div>\n
The code above when executed will output as:<\/p>\n
EmployeeArrayList Test Output<\/em><\/span><\/p>\n
First Name: John Last Name: Smith EmployeeId: 21\nFirst Name: George Last Name: Smith EmployeeId: 41\n<\/pre>\n
3. Download the Source Code<\/h2>\n
This was an example of the Iterable Java Interface – java.lang.Iterable<\/code> .<\/p>\n
Download<\/strong>
You can download the full source code of this example here: Iterable Java Example – java.lang.Iterable Interface<\/a><\/strong><\/div>\n
Last updated on May 18th, 2020<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"
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