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Object Oriented Programming Articles
Page 208 of 589
Program to Iterate over a Stream with Indices in Java 8
To iterate over a Stream with Indices in Java 8, the code is as follows −Exampleimport java.util.stream.IntStream; import java.util.*; import java.util.concurrent.atomic.AtomicInteger; public class Demo{ public static void main(String[] args){ String[] my_array = { "T", "h", "i", "s", "s", "a", "m", "p", "l", "e" }; AtomicInteger my_index = new AtomicInteger(); System.out.println("The elements in the string array are :"); Arrays.stream(my_array).map(str -> my_index.getAndIncrement() + " -> " + str).forEach(System.out::println); } }OutputThe elements in the string array are : 0 -> T 1 -> h 2 -> i 3 -> ...
Read MoreJava program to find Maximum and minimum element's position in a list
To find the maximum and minimum element’s position in a list, the Java program is as follows −Exampleimport java.util.*; import java.util.Arrays; import java.util.Collections; public class Demo{ public static int index_val(int my_arr[], int t){ if (my_arr == null){ return -1; } int len = my_arr.length; int i = 0; while (i < len){ if (my_arr[i] == t){ return i; } else { ...
Read MoreJava Program for Bitonic Sort
In Bitonic Sort, the comparision is in predefined sequence (Bitonic sequence), not dependent on the data to be sorted. Let us see an example for Bitonic Sort Java program −Examplepublic class Demo{ void compare_swap(int my_arr[], int i, int j, int direction){ if ((my_arr[i] > my_arr[j] && direction == 1) || (my_arr[i] < my_arr[j] && direction == 0)){ int temp = my_arr[i]; my_arr[i] = my_arr[j]; my_arr[j] = temp; } } void merge_vals(int my_arr[], int low, int cnt, int direction){ ...
Read MoreJava program to split the Even and Odd elements into two different lists
To split the Even and Odd elements into two different lists, the Java code is as follows −Exampleimport java.util.Scanner; public class Demo{ public static void main(String[] args){ int n, j = 0, k = 0; Scanner s = new Scanner(System.in); System.out.println("Enter the number of elements required :"); n = s.nextInt(); int my_arr[] = new int[n]; int odd_vals[] = new int[n]; int even_vals[] = new int[n]; System.out.println("Enter the elements of the array(even and add numbers) :"); ...
Read MoreInitialization of local variable in a conditional block in Java
Java compiler doesn’t allow abandoning an uninitialized local variable. When a local variable is initialized inside a conditional block, there are 3 possibilities that could potentially occur −Code compiles successfully if values are provided in the conditional block and the given condition is true.Code gives a compilation error if variables are provided (instead of values) in the conditional block and the condition is true.Code gives compilation error if the condition that needs to be checked is false.If the local variable is initialized to a default value outside of the conditional block in the code, it won’t give any error and ...
Read MoreInteresting facts about Array assignment in Java
There are many facts with respect to array assignment, and we will discuss a few of them with working examples here −While creating array object type, the element that would be present inside the array can be declared as type objects or as child class’s object.Examplepublic class Demo{ public static void main(String[] args){ Number[] my_val = new Number[3]; my_val[0] = new Integer(91); my_val[1] = new Double(65.963); my_val[2] = new Double(45.7965); System.out.println(my_val[0]); System.out.println(my_val[1]); System.out.println(my_val[2]); } }Output91 65.963 45.7965A ...
Read MoreInteresting facts about Increment and Decrement operators in Java
There are many interesting facts with respect to increment and decrement operators in Java. We will discuss a few of them with examples −The increment and decrement operators can’t be used with the ‘final’ variables. This is due to the fact that variables associated with ‘final’ keyword can’t be changed −Examplepublic class Demo{ public static void main(String[] args){ final int my_val = 34; int my_val_2 = ++my_val; System.out.println("The value is :"); System.out.println(my_val_2); } }Output/Demo.java:6: error: cannot assign a value to final variable my_val int my_val_2 = ...
Read MoreInteresting facts about null in Java
There are many facts associated with null in Java. We will discuss a few of them here with examples −The default value of any reference variable in Java is always null.Examplepublic class Demo{ private static Object my_obj; public static void main(String args[]){ System.out.println("The default value of object my_obj is : " + my_obj); } }OutputThe default value of object my_obj is : nullA class named Demo defines a static object and the main function that shows the default value of this pre-defined object.The not equal to (!=) and comparison (==) operators can be used ...
Read MoreIs an array a primitive type or an object in Java?
Array is considered to be an object in Java. The reason behind this is that an array can be created using the ‘new’ keyword. The ‘new’ keyword/operator is always used to create an object. This is how an array is perceived as an object.The direct parent class or super class of any array is the ‘Object’ class. Every array type in Java belongs to a certain class. This indicates that there are explicit classes for integer array types, float array types, double array types, and so on.Arrays can be dynamically created, and be assigned variables as well.Let us see an ...
Read MoreIsland of Isolation in Java
After an object has been used, it is deallocated from the memory using the Garbage Collector class. The objects are destroyed based on the fact that no reference to that object is present. The Garbage Collector class calls the ‘finalize’ function on the object that needs to be destroyed.What is island of isolation?When two objects ‘a’, and ‘b’ reference each other, and they are not referenced by any other object, it is known as island of isolation.It is a group of objects which reference each other but they are not referenced but other objects of other applications at all.Note − ...
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