JAVA INTERVIEW

 

This page is created for answering some of the most important and common questions asked during Java interview. These answers are more than enough for a beginner level engineer to satisfy interviewer. Will put more content gradually.




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Priority Scheduling Algorithm Java Program.

import java.util.Scanner; public class priority{ public static void main(String args[]) { Scanner s = new Scanner(System.in); int x,n,p[],pp[],bt[],w[],t[],awt,atat,i; p = new int[10]; pp = new int[10]; bt = new int[10]; w = new int[10]; t = new int[10]; //n is number of process //p is process //pp is process priority //bt is process burst time //w is wait time // t is turnaround time //awt is average waiting time //atat is average turnaround time System.out.print("Enter the number of process : "); n = s.nextInt(); System.out.print("\n\t Enter burst time : time priorities \n"); for(i=0;i<n;i++) { System.out.print("\nProcess["+(i+1)+"]:"); bt[i] = s.nextInt(); pp[i] = s.nextInt(); p[i]=i+1; } //sorting on the basis of priority for(i=0;i<n-1;i++) { for...
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Implement a class CppArray which is identical to a one-dimensional C++ array (i.e., the index set is a set of consecutive integers starting at 0) except for the following : 1. It performs range checking. 2.It allows one to be assigned to another array through the use of assignment operator. 3.It supports a function that returns the size of the array.

#include<iostream> #include<math.h> using namespace std; class array {      int a[10],b[10],i,j,temp,n;           public:             void accept();             void display();             void range();             void sort();             void exchange();             int size(); }; void array::accept() {     cout<<"How many Elements you want to insert into the array=\n";     cin>>n;     cout<<"Enter the array Elements=\n";     for(i=0;i<n;i++)        {             cout<<...
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Implement UNIX system calls like ps, fork, join, exec family, and wait for process management (use shell script/ Java/ C programming).

//A small example to show how to use execvp() function in C. We will have two .C files , EXEC.c and execDemo.c and we will replace the execDemo.c with EXEC.c by calling execvp() function in execDemo.c . //EXEC.c  #include<stdio.h>  #include<unistd.h>  int main()   {        int i;       printf("This  is EXEC.c, called by execvp() ");        printf("\n");       return 0;   }  Now,create an executable file of EXEC.c using command  gcc EXEC.c -o EXEC //execDemo.c #include<stdio.h> #include<stdlib.h>  #include<unistd.h>  int main()  {     //A null terminated array of character      //pointers       char *args[]={"./EXEC",NULL};       execvp(args[0],args);     /*All statements are ignored after execvp() call as this whole process(execDemo.c) is replaced by ...
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