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Articles by Maruthi Krishna
Page 49 of 50
How to access the object of a class without using the class name from a static context in java?
The only possible solution is to get the stack trace of the current thread. Get the class name using an element in the stack trace. Pass it to the forName() method of the class named Class.This returns a Class object and you can get an instance of this class using the newInstance() method.Examplepublic class MyClass { String name = "Krishna"; private int age = 25; public MyClass() { System.out.println("Object of the class MyClass"); System.out.println("name: "+this.name); System.out.println("age: "+this.age); } public static void demoMethod() throws Exception { ...
Read MoreAre values returned by static method are static in java?
Whenever you return values from a static method they are either static nor instance by default, they are just values.The user invoking the method can use them as he wants. i.e. you can retrieve the values and declare them static.But, since you cannot declare variables of a method static if you need to declare the vales returned by a method static you need to invoke it in the class outside the methods.ExampleAssume we have a class with name Demo as −class Demo{ int data = 20; public Demo(int data){ this.data = data; } ...
Read MoreHow to resolve javac is not recognized as an internal or external command in java?
When you compile a program if you see this error it indicates that either you have not installed Java in your system properly or, you haven’t set the Path variable.The Path variable − The path environment variable is used to specify the set of directories which contains executional programs.When you try to execute a program from command line, the operating system searches for the specified program in the current directly, if available, executes it.In case the programs are not available in the current directory, operating system verifies in the set of directories specified in the ‘PATH’ environment variable.Setting Up the ...
Read MoreArrayIndexOutOfBounds Vs ArrayStoreException in Java?
An array is a data structure/container/object that stores a fixed-size sequential collection of elements of the same type. The size/length of the array is determined at the time of creation.The position of the elements in the array is called as index or subscript. The first element of the array is stored at the index 0 and, the second element is at the index 1 and so on.Creating an arrayIn Java, arrays are treated as referenced types you can create an array using the new keyword similar to objects and populate it using the indices as −int myArray[] = new int[7]; ...
Read MoreWhat are the drawbacks of the arrays in Java?
Array is a container which can hold a fix number of items and these items should be of the same type. Most of the data structures make use of arrays to implement their algorithms. Following are the important terms to understand the concept of Array.Element − Each item stored in an array is called an element.Index: Each location of an element in an array has a numerical index, which is used to identify the element.The size of the array will be determined at the time of creation.Disadvantages of arraysDeleting or inserting − You cannot insert a new element at the ...
Read MoreHow do you find continuous sub array whose sum is equal to a given number in Java?
To find continuous sub array whose sum is equal to a given number −Iterate through the array.At each element add the next n elements one by one, when the sum equals to the required value print the sub array.Exampleimport java.util.Arrays; import java.util.Scanner; public class sub_arrays { public static void main(String args[]){ //Reading the array from the user Scanner sc = new Scanner(System.in); System.out.println("Enter the size of the array that is to be created: "); int size = sc.nextInt(); int[] myArray = new int[size]; ...
Read MoreHow do you separate zeros from non-zeros in an integer array using Java?
To separate zeros from non-zeros in an integer array, and push them to the end, you need to rearrange it array by assigning all the nonzero elements to its positions, sequentially, starting from zero. Then, from last position of the array to its end populate it with zeros.ExampleFollowing Java program pushes all the zeros in an array to its end.import java.util.Arrays; import java.util.Scanner; public class ZerosFromNonZeros { public static void main(String args[]){ //Reading the array from the user Scanner sc = new Scanner(System.in); System.out.println("Enter the size of the array that ...
Read MoreHow to find the missing number in a given Array from number 1 to n in Java?
If a single number is missing in an integer array that contains a sequence of numbers values, you can find it basing of the sum of numbers or, basing on the xor of the numbers.Based on the sum of the numbers −The sum of n sequential numbers will be [n*(n+1)]/2. Using this get the sum of the numbers the n numbers.Add all the elements in the array.Subtract the sum of the numbers in the array from the sum of the n numbers.Exampleimport java.util.Scanner; public class MissingNumber { public static void main(String[] args) { Scanner sc = ...
Read MoreWrite a program to find the first non-repeating number in an integer array using Java?
To find the first non-repeating number in an array −Construct count array to store count of each element in the given array with same length and with initial value 0 for all elements.Compare each element in the array with all other elements, except itself.If match occurs increment its value in the count array.Get the index of the first 0 in the count array and print the element in the input array at this index.Exampleimport java.util.Arrays; public class NonRpeatingArray { public static void main(String args[]) { int array[] = {114, 225, 669, 996, 336, 6547, 669, 225, ...
Read MoreHow to get file URI reference in Java?
The class named File of the java.io package represents a file or directory (path names) in the system. This class provides various methods to perform various operations on files/directories.In general, an URI (Uniform Resource Identifier) represents a resource. The URI class of Java represents this format You can get the URI format of a file by invoking the toURI() method.ExampleFollowing Java example, prints the URI format of the file named samplefile.txtimport java.io.File; import java.io.IOException; import java.net.URI; public class GetURI { public static void main(String args[]) throws IOException { //Instantiating the File class String ...
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