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An Iterator can be used to loop through a HashMap. The method hasNext( ) returns true if there are more elements in HashMap and false otherwise. The method next( ) returns the next key element in the HashMap and throws the exception NoSuchElementException if there is no next element.A program that demonstrates this is given as follows.Example Live Demoimport java.util.HashMap; import java.util.Iterator; import java.util.Map; public class Demo { public static void main(String[] args) { Map student = new HashMap(); student.put("101", "Harry"); student.put("102", "Amy"); student.put("103", "John"); ... Read More
An element can be removed from a Collection using the Iterator method remove(). This method removes the current element in the Collection. If the remove() method is not preceded by the next() method, then the exception IllegalStateException is thrown.A program that demonstrates this is given as follows.Example Live Demoimport java.util.ArrayList; import java.util.Iterator; public class Demo { public static void main(String[] args) { ArrayList aList = new ArrayList(); aList.add("Apple"); aList.add("Mango"); aList.add("Guava"); aList.add("Orange"); aList.add("Peach"); System.out.println("The ArrayList elements are: "); ... Read More
An Iterator can be used to loop through an LinkedList. The method hasNext( ) returns true if there are more elements in LinkedList and false otherwise. The method next( ) returns the next element in the LinkedList and throws the exception NoSuchElementException if there is no next element.A program that demonstrates this is given as follows.Example Live Demoimport java.util.LinkedList; import java.util.Iterator; public class Demo { public static void main(String[] args) { LinkedList l = new LinkedList(); l.add("John"); l.add("Sara"); l.add("Susan"); l.add("Betty"); l.add("Nathan"); ... Read More
Line break in a UILabel is used to change how the text appears on a label. Suppose a label has text more than two lines but by default the Line break in a UILabel is used to change how the text appears on a label. Suppose a label has text more than two lines but by default the label shows 1 line and wraps/ trims the text that’s more than the label size.This can be done in multiple ways. Three of them are mentioned below.On the storyboard add a label.Give top constraint, trailing and leading constraint.Method One − Editing with ... Read More
Before getting into an example, we should know what string builder is. StringBuilder class is used to create a mutable string and it is not thread safe so multiple thread can access string builder class at a time. This example demonstrate about How to use string Builder class in android.Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml. In the ... Read More
A specific element in the LinkedList can be removed using the java.util.LinkedList.remove() method. This method removes the specified element the first time it occurs in the LinkedList and if the element is not in the LinkedList then no change occurs. The parameter required for the LinkedList.remove() method is the element to be removed.A program that demonstrates this is given as follows.Example Live Demoimport java.util.LinkedList; public class Demo { public static void main(String[] args) { LinkedList l = new LinkedList(); l.add("Apple"); l.add("Mango"); l.add("Pear"); l.add("Orange"); ... Read More
Before getting into example, we should know what string buffer is. StringBuffer class is used to create mutable string and it is thread safe. This example demonstrate about How to use string buffer in android.Step 1 − Create a new project in Android Studio, go to File ⇒ New Project and fill all required details to create a new project.Step 2 − Add the following code to res/layout/activity_main.xml. In the above code, we have taken edittext, button and textviews. When user click on button, it ... Read More
A ListIterator can be used to traverse the elements in the forward direction as well as the reverse direction in a LinkedList. The method hasPrevious( ) in ListIterator returns true if there are more elements in the LinkedList while traversing in the reverse direction and false otherwise. The method previous( ) returns the previous element in the LinkedList and reduces the cursor position backward.A program that demonstrates this is given as follows.Example Live Demoimport java.util.LinkedList; import java.util.List; import java.util.ListIterator; public class Demo { public static void main(String[] args) { List l = new LinkedList(); ... Read More
The previous index and next index in an ArrayList can be obtained using the methods previousIndex() and nextIndex() respectively in the ListIterator Interface.The previousIndex() method returns the index of the element that is returned by the previous() method while the nextIndex() method returns the index of the element that is returned by the next() method. Neither of these methods require any parameters.A program that demonstrates this is given as followsExample Live Demoimport java.util.ArrayList; import java.util.ListIterator; public class Demo { public static void main(String[] args) { ArrayList aList = new ArrayList(); aList.add("Amy"); ... Read More
In this tutorial, we are going to see different methods to increment a character in Python.TypecastingLet's first see what happens if we add an int to char without typecasting.Example Live Demo## str initialization char = "t" ## try to add 1 to char char += 1 ## gets an errorIf you execute above program, it produces the following result −TypeError Traceback (most recent call last) in () 3 4 ## try to add 1 to char ----> 5 char += 1 ## gets an error TypeError: must be str, not intTo ... Read More