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This is defined in java.lang package and was introduced with Java 5. 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{"@context":"http:\/\/schema.org","@type":"Article","dateCreated":"2015-01-30T11:00:42+02:00","datePublished":"2015-01-30T11:00:42+02:00","dateModified":"2020-08-10T10:31:13+03:00","headline":"Iterable Java Example – java.lang.Iterable Interface","name":"Iterable Java Example – java.lang.Iterable Interface","keywords":"Iterable","url":"https:\/\/examples.javacodegeeks.com\/iterable-java-example-java-lang-iterable-interface\/","description":"This article shows an Iterable Java example - java.lang.Iterable interface. This is defined in java.lang package and was introduced with Java 5. The Iterable is defined as a generic type; Iterable<","copyrightYear":"2015","articleSection":"Iterator","articleBody":"\nThis article shows an Iterable Java example - java.lang.Iterable interface. This is defined in java.lang package and was introduced with Java 5. The Iterable is defined as a generic type; Iterable<T>, where T type parameter represents the type of elements returned by the iterator.\n\n\n\nAn 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.\n\n\n\nBefore the iterable's for-each loop was introduced, a way to iterate is to use the for(;;) loop or to use an Iterator; typically the Iterator could be acquired by invoking a collection object's iterator() method. The iterator has been in Java since Java 1.2.\n\n\n\nThe Iterable interface provides a clean approach to coding the iteration functionality. An example shows iterating over a List collection with String object elements:\n\n\n\n\n\n\n\n\n\n1\n2\n3\n4\n\n\n\nList<String> stringList = new ArrayList<>();\nstringList.add(\"a\");\nstringList.add(\"b\");\nstringList.add(\"c\");\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n1\n2\n3\n4\n\n\n\nfor (String s : stringList) {\n \n    System.out.println(s);\n}\n\n\n\n\n\n\n\n\n\n\nThe 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 respectively.\n\n\n\n\n\n\n\n\n\n1\n2\n3\n4\n\n\n\nfor (int i = 0; i < stringList.size(); i++) {\n \n    System.out.println(stringList [i]);\n}\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n1\n2\n3\n4\n5\n6\n\n\n\nIterator<String> iter = stringList.iterator();\n \nwhile (iter.hasNext()) {\n \n    System.out.println(iter.next());\n}\n\n\n\n\n\n\n\n\n\n\nNote that there is also a possibility of introducing a bug in the above two code snippets, because of the details.\n\n\n\n1. Iterable Java Example\n\n\n\nThe following example class implements the Iterable interface. The class takes an input array of any type and iterates it in a for-each loop and in reverse order.\n\n\n\nThe Iterable interface has one method to override: Iterator<T> iterator().\n\n\n\nThe example has the iterable implementation MyIterable.java and a tester class MyIterableTester.java. The example code requires Java SE 5 or greater.\n\n\n\nMyIterable Class example is shown in the code below:\n\n\n\nMyIterable \nimport 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\n\n\n\nMyIterableTester Class example is shown in the code below:\n\n\n\nimport 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\n\n\n\nThe code above when executed will output as:\n\n\n\nMyIterableTester\n3\n2\n1\n\n\n\n\n2. Custom Iterable Data Structure\n\n\n\nLet us look at building a custom iterable data structure.  First, we will look at Employee Class. The Employee class has attributes firstName,lastName, and employeeId. The Employee class code is implemented as below:\n\n\n\nEmployee Class\nimport 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\n\n\n\nNow let us look at EmployeeArrayList  implementation which implements the Iterator interface. The iterator method is overridden to return the employees arrayList iterator.\n\n\n\nimport 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}\n\n\n\nThe code above when executed will output as:\n\n\n\nEmployeeArrayList Test Output\nFirst Name: John Last Name: Smith EmployeeId: 21\nFirst Name: George Last Name: Smith EmployeeId: 41\n\n\n\n\n3. Download the Source Code\n\n\n\nThis was an example of the Iterable Java Interface - java.lang.Iterable .\n\n\n\nDownloadYou can download the full source code of this example here: Iterable Java Example - java.lang.Iterable Interface\n\n\n\nLast updated on May 18th, 2020\n","publisher":{"@id":"#Publisher","@type":"Organization","name":"Examples Java Code Geeks","logo":{"@type":"ImageObject","url":"\/wp-content\/uploads\/2013\/05\/JavaCodeGeeks-logo.png"},"sameAs":["https:\/\/feeds.feedburner.com\/examplesjavacodegeeks","https:\/\/www.facebook.com\/javacodegeeks","https:\/\/twitter.com\/javacodegeeks","https:\/\/www.linkedin.com\/groups\/3810709\/","https:\/\/www.youtube.com\/channel\/UCxoUc7Rar2q90Gu0nT2ffuQ","https:\/\/github.com\/javacodegeeks\/"]},"sourceOrganization":{"@id":"#Publisher"},"copyrightHolder":{"@id":"#Publisher"},"mainEntityOfPage":{"@type":"WebPage","@id":"https:\/\/examples.javacodegeeks.com\/iterable-java-example-java-lang-iterable-interface\/","breadcrumb":{"@id":"#Breadcrumb"}},"author":{"@type":"Person","name":"Prasad Saya","url":"https:\/\/examples.javacodegeeks.com\/author\/prasad-saya\/"},"image":{"@type":"ImageObject","url":"https:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2012\/12\/java-logo.jpg","width":1200,"height":150}}