1. What is wrong in the following code? How it can be fixed? Is there another way to fix it? class Test { public static void main (String[] args) { A a = new A(); a.print (); class A { String s; A (String s) { this.s = s; } public void print () { System.out.print (s);

1. What is wrong in the following code? How it can be fixed? Is there another way to fix it? class Test { public static void main (String[] args) { A a = new A(); a.print (); class A { String s; A (String s) { this.s = s; } public void print () { System.out.print (s);

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

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public class Main { static int findPosSum(int A[], int N) { if (N <= 0) return 0; { if(A[N-1]>0) return (findPosSum(A, N - 1) + A[N - 1]); else return findPosSum(A, N - 1); } } public static void main(String[] args) { int demo[] = { 11, -22, 33, -4, 25,12 }; System.out.println(findPosSum(demo, demo.length)); } } Consider the recursive function you wrote in the previous problem. Suppose the initial call to the function has an array of N elements, how many recursive calls will be made? How many statements are executed in each call? What is the total number of statements executed for all recursive calls? What is the big O for this function?
identify the errors in the following class and how it can be fixed? public class Test { public static void main(String[] args) { int x String y; System.out.printin("x is "+ x); System.out.printin("y is "+ y);
What does the following code print out? public class MysteryNumbers static void Main(string[] args) { String one = "two"; String two String three = "1"; int number = 20; = "three"; Sentence (one, two, 3); Sentence (two, three, 14); Sentence (three, "three", number + 1); Sentence (three, two, 1); Sentence ("eight", three, number / 2); } public static void Sentence (String three, String one, int number) System.out.println (three + times + one + = " + (number * 2)); }
StringFun.java import java.util.Scanner; // Needed for the Scanner class 2 3 /** Add a class comment and @tags 4 5 */ 6 7 public class StringFun { /** * @param args not used 8 9 10 11 12 public static void main(String[] args) { Scanner in = new Scanner(System.in); System.out.print("Please enter your first name: "); 13 14 15 16 17 18 System.out.print("Please enter your last name: "); 19 20 21 //Output the welcome message with name 22 23 24 //Output the length of the name 25 26 27 //Output the username 28 29 30 //Output the initials 31 32 33 //Find and output the first name with switched characters 34 //All Done! } } 35 36 37
preLabC.java 1 import java.util.Random; 2 import java.util.StringJoiner; 3 4- public class preLabC { 5 6- 7 8 9 10 11 12 13 14 15 16 17 18 19 20 } public static String myMethod(MathVector inputVector) { String vectorStringValue = new String(); // empty String object System.out.println("here is the contents object, inputVector: + inputVector); // get a String out of that MathVector object. Do it here. On the next line. // return the double value here. return vectorStringValue; "1 ▸ Compilation Description A MathVector object will be passed to your method. Return its contents as a String. If you look in the file MathVector.java you'll see there is a way to output the contents of a MathVector object as a String. This makes it useful for displaying to the user. /** * Returns a String representation of this vector. The String should be in the format "[1, 2, 3]" * * @return a String representation of this vector * @apiNote **DO NOT** use the built-in (@code Arrays.toString()} method. */…
Consider the following piece of code. (The numbers on the left margin denote line numbers.) line#01 public class funcRef {02 private int n;03 public funcRef (int m) {n = m;}04 public static void func (funcRef t) {t.n++;}05 public static void main (String [] args) {06 funcRef t1, t2;07 t1 = new funcRef(20);08 t2 = t1;09 System.out.print(t2.n);10 func(t1);11 System.out.print(t2.n);12 func(t1);13 System.out.print(t1.n);14 func(t2);15 System.out.print(t1.n);16 func(t2);17 System.out.print(t1.n);18 System.out.print(t1.n);19 return;20 }21 } Out of the following, tick the true statements and leave the false statements unticked.(More than one of the statements could be true. You get full marks only for marking all the statements correctly. There are no partial marks.) A. The output of the program will be 202022222222. B. When func(t1) is called in line…
8) Now use the Rectangle class to complete the following tasks: - Create another object of the Rectangle class named box2 with a width of 100 and height of 50. Note that we are not specifying the x and y position for this Rectangle object. Hint: look at the different constructors) Display the properties of box2 (same as step 7 above). - Call the proper method to move box1 to a new location with x of 20, and y of 20. Call the proper method to change box2's dimension to have a width of 50 and a height of 30. Display the properties of box1 and box2. - Call the proper method to find the smallest intersection of box1 and box2 and store it in reference variable box3. - Calculate and display the area of box3. Hint: call proper methods to get the values of width and height of box3 before calculating the area. Display the properties of box3. 9) Sample output of the program is as follow: Output - 1213 Module2 (run) x run: box1: java.awt. Rectangle [x=10, y=10,width=40,height=30] box2: java.awt.…
public class F { private boolean x; public class Test { public static void main (String[] args) { Ff = new F(); System.out.println(f.x); System.out .println(f. convert (f.x)); } public static void main(String[] args) { Ff = new F (); System.out.println (f.x); System.out.println(f.convert ()); private int convert(boolean b) { return x ? 1: -1; Is the above code in the classes above correct? Circle your answer choice: YES or NO If NO, write below the corrected code.
Write a method that prints: 5 4 3 2 1 4 3 2 1 3 2 1 2 1 1 class Main {public static void main(String[] args) {}}
JAVA The method takes a string as a parameter. The method prints treat if the string is candy or chocolate (of any case, such as CaNdY) Otherwise print trick import java.util.Scanner; public class Class1 { public static void trickOrTreat(String str) { //Enter code here }
import java.awt.*; public class TestRectangle {public static void main(String[] args) {Rectangle r1 = new Rectangle(5, 4, 10, 17);Rectangle r2 = new Rectangle(10, 10, 20, 3);Rectangle r3 = new Rectangle(0, 1, 12, 15);Rectangle r4 = new Rectangle(10, 10, 20, 3);System.out.println("r1 = " + r1);System.out.println("r2 = " + r2);System.out.println("r3 = " + r3);System.out.println("r2 equals r1? " + r2.equals(r1));System.out.println("r2 equals r2? " + r2.equals(r2));System.out.println("r2 equals r3? " + r2.equals(r3));System.out.println("r2 equals r4? " + r2.equals(r4)); System.out.println("r1 contains (6, 8)? = " + r1.contains(6, 8));System.out.println("r2 contains (6, 8)? = " + r2.contains(6, 8));System.out.println("r3 contains (6, 8)? = " + r3.contains(6, 8));System.out.println("r2 contains (30, 13)? = " + r2.contains(30, 13)); r1.intersect(r3);r2.intersect(r4);System.out.println("r1 intersect r3 = " + r1);System.out.println("r2 intersect r4 = " + r2);…
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