public class MyClass { public static void main(String args[]) id(1) id(2) "s26j9876" }; id(0) String [] id = { "s26j1234", "s26j13456" System.out.print(id[0].length( )+id[2].indexOf ('7')); System.out.print(id.length); %3D a. 144 b. 142 C. 143 d. 150

public class MyClass { public static void main(String args[]) id(1) id(2) "s26j9876" }; id(0) String [] id = { "s26j1234", "s26j13456" System.out.print(id[0].length( )+id[2].indexOf ('7')); System.out.print(id.length); %3D a. 144 b. 142 C. 143 d. 150

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

See similar textbooks

Similar questions

Java Implement 5 methods given below in MyStringArrayList class // Add a new element, e, at the beginning of this list public void addFront(String e){ } //search for element e, returns true if found, otherwise returns false. public boolean contains(String e){ } //return the element at position i, otherwise returns null public String getElement(int i){ } // remove the element at specified index, returns the element that is being removed. Returns null if specified index is invalid. public String removeElementAt(int i){ } //returns a String representation of this list. public String toString(){ }
Multiple integers, representing the number of babies, are read from input and inserted into a linked list of TurtleNodes. Find the sum of all the integers in the linked list of TurtleNodes. Ex: If the input is 3 38 18 23, then the output is: 82 import java.util.Scanner; public class TurtleLinkedList { public static void main(String[] args) { Scanner scnr = new Scanner(System.in); TurtleNode headTurtle = null; TurtleNode currTurtle = null; TurtleNode lastTurtle = null; int count; int inputValue; int i; int sum; count = scnr.nextInt(); headTurtle = new TurtleNode(count); lastTurtle = headTurtle; for (i = 0; i < count; ++i) { inputValue = scnr.nextInt(); currTurtle = new TurtleNode(inputValue); lastTurtle.insertAfter(currTurtle); lastTurtle = currTurtle; } /* Your code goes here */ System.out.println(sum); }} class TurtleNode { private int…
import java.util.Scanner; public class ContactList { public static void main(String[] args) { Scanner scnr = new Scanner(System.in); ContactNode head = null; ContactNode current = null; // Read the name and phone number for three contacts and build a linked list. for (int i = 1; i <= 3; i++) { System.out.print(" " + i + ": "); String name = scnr.next(); System.out.print(" " + i + ": "); String phoneNumber = scnr.next(); ContactNode newContact = new ContactNode(name, phoneNumber); if (head == null) { head = newContact; current = head; } else { current.insertAfter(newContact); current = newContact; } } // Output each contact. current = head; for (int i = 1; current != null; i++) { System.out.print("Person " + i + ": "); current.printContactNode();…
I need help with my Optimizing the intermediate code to improve the efficiency of the generated machine code. I need to improve the effixiency of the generated machine code import java.util.*; public class SimpleCalculator { private final String input; private int position; private boolean hasDivByZero = false; private Map<String, String> symbolTable; private List<String> instructions; public SimpleCalculator(String input) { this.input = input; this.position = 0; this.symbolTable = new HashMap<>(); this.instructions = new ArrayList<>(); } public static void main(String[] args) { SimpleCalculator calculator = new SimpleCalculator("3 + 5 * (2 - 1)"); calculator.parseExpression(); if (calculator.hasDivByZero) { System.out.println("Error: division by zero"); } else { System.out.println("Result: " + calculator.instructions); } } public void parseExpression() { String t1 = parseTerm(); while (true) { String op = null; if (consume('+')) { op = "+"; } else if…
Computer Science JAVA!!!!!!!! Use the class MyArrayList to implement the interface MyList listed below using parallel streams and write a test program to test the methods. The class should be thread safe. interface MyList{ public void add(E x); public void add(List lst); public boolean forAll(Predicate pr); public boolean exists(Predicate pr); public long count(Predicate pr); public List map(Function fn); public List filter(Predicate pr); public List mapFilter(Function fn, Predicate pr); } class MyArrayList implements MyList{ private ArrayList data = new ArrayList<>(); … }
In java pls! here is some starter code for this problem: public class ThreadingDivisors { public static void main(String[] args) { long start = System.currentTimeMillis(); int maxDivisors = 0; int answer = 0; for (int n=1; n<100000; n++) { int divisors = getNumDivisors(n); if (divisors > maxDivisors) { maxDivisors = divisors; answer = n; } } System.out.println(answer + " has the most divisors (" + maxDivisors + ")"); long end = System.currentTimeMillis(); System.out.println(end - start + " milliseconds"); } public static int getNumDivisors(int n) { int numDivisors = 0; for (int i=1; i<=n; i++) { if (n % i == 0) { numDivisors++; } } return numDivisors; } }
a Java method that takes an array of integers as its only parameter and returns the "centered" average of that list as a double. If the smallest or largest value occurs more than once, only keep one copy.
In java, Implement a method that removes all duplicates. Keep the first instance of the element but remove all subsequent duplicate elements.public void removeDuplicates() see the picture for the right output. Given files: Demo6.java public class Demo6 { public static void main(String[] args) { MyLinkedList<String> list = new MyLinkedList<>(); TestBench.addToList(list); TestBench.addToList(list); TestBench.addToList(list); TestBench.addToList(list); for (int x = 0; x < list.size(); x += 1 + x/3) { System.out.println("Removing element at index: " + x); list.remove(x); } System.out.println("Result"); System.out.println(list); System.out.println("Shuffling"); list.shuffle(7777); System.out.println(list); System.out.println("Removing duplicates (keeping first instance)"); list.removeDuplicates(); System.out.println(list); }} TestBench.java import java.util.AbstractList; public class TestBench { public static…
FOR JAVA, with StdDraw, and StdRandom Write a static method histogram() that takes an array a[ ] of int values and an integer M as arguments and returns an array of length M whose ith entry is the number of times the integer i appeared in the argument array. If the values in a[ ] are all between 0 and M–1, the sum of the values in the returned array should be equal to a.length.
We were given the following code to solve a Pentomino puzzle, several methods might need to be added or editted to solve the problem. The program should take in an input of 3 4 5 6 for 3x20 4x15 5x12 6x10 grids. Then output the number of correct solutions for them (respectively its 2, 368, 1010, and 2339) import java.util.ArrayList;import java.util.LinkedList;import java.util.List; public class DLX { class DataNode { DataNode L, R, U, D; ColumnNode C; public DataNode() { L = R = U = D = this; } public DataNode(ColumnNode c) { this(); C = c; } DataNode linkDown(DataNode node) { node.D = this.D; node.D.U = node; node.U = this; this.D = node; return node; } DataNode linkRight(DataNode node) { node.R = this.R; node.R.L = node; node.L = this; this.R = node; return node;…
Consider class IntArrayStack that has two instance variables: int[] data and int top. Implement an instance method inside the IntArrayStack, called popBottom(),that extracts and returns as output the element at the bottom of the stack. All other elements in the stack must remain unchanged and in the same order.
For this problem I have a java code: import java.util.Arrays; import java.util.Scanner; public class MergeSortWeightedSumInversion { public static long merge(int arr[], int l, int mid, int r) { long weight = 0; int n1 = mid-l+1; int n2 = r-mid; int[] a = new int[n1]; int[] b = new int[n2]; for(int i = 0; i < n1; i++) { a[i] = arr[l+i]; } for(int i = 0; i < n2; i++) { b[i] = arr[mid+i+1]; } int i = 0, j = 0, k = l; while(i<n1 && j<n2) { if(a[i] <= b[j]) { arr[k] = a[i]; k++; i++; } else { weight += (a[i] + b[j]); arr[k] = b[j]; k++; j++; } } while(i<n1) { arr[k] = a[i]; k++; i++; } while(j<n2) { arr[k] = b[j]; k++; j++; } return weight; } public static long mergeSort(int arr[], int l, int r) { long weight = 0; if(l < r) { int mid = (l+r)/2; weight += mergeSort(arr, l, mid); weight += mergeSort(arr,mid+1,r); weight += merge(arr,l,mid,r); } return weight; } public static void main(String[] args) { Scanner scan = new Scanner(System.in); int n; n =…