Error Constructor Cannot Be Applied To Given Types
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Java Constructor Cannot Be Applied To Given Types
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Sign up Constructor in class cannot be applied to given types up vote 3 down vote favorite I ve got the following code using arrays to find some prim numbers. However, when trying to compile my user class PalindromeArrayUser it says - "Constructor in class cannot be applied to given types" required: int. found: no arguments. reason: actual and formal arguments lists
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differ in length. However, I have passed to the constructer an int value (the same way it was designed in my blueprint). I don't quite get where the problem comes from. Thanks. Here are my two classes public class PalindromeArray { int arrLength; public PalindromeArray(int InputValue) { arrLength = InputValue; } int arr[] = new int[arrLength]; boolean check[] = new boolean [arrLength]; public void InitializeArray() { for (int k = 2; k < arr.length; k++) { arr[k] = k; check[k] = true; } } public void primeCheck() { for (int i = 2; i < Math.sqrt(arr.length - 1); i++ ) { if (check[i] == true) { for (int j = 2; j < arr.length; j++) { if (j % i == 0) { check[j] = false; check[i] = true; } } } } } public void PrintArray() { for (int k = 2; k < arr.length; k++) { if ((!check[k]) == false) System.out.println(arr[k]); } } } And this is my User class where the problem comes from. The class above compiles fine. import java.io.*; public class PalindromeArrayUser extends PalindromeArray { public static void
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about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack constructor person in class person cannot be applied to given types Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping http://stackoverflow.com/questions/19788963/constructor-in-class-cannot-be-applied-to-given-types each other. Join them; it only takes a minute: Sign up “Constructor cannot be applied to given types” when constructors have inheritance up vote 2 down vote favorite 1 This is my base class: abstract public class CPU extends GameObject { protected float shiftX; protected float shiftY; public CPU(float x, float y) { super(x, y); } and http://stackoverflow.com/questions/14384563/constructor-cannot-be-applied-to-given-types-when-constructors-have-inheritanc here is one of its subclasses: public class Beam extends CPU { public Beam(float x, float y, float shiftX, float shiftY, int beamMode) { try { image = ImageIO.read(new File("/home/tab/Pictures/Beam"+beamMode+".gif")); } catch (Exception e) { e.printStackTrace(); } this.x = x; this.y = y; this.shiftX = shiftX; this.shiftY = shiftY; } The New constructor is highlighted and it says: Constructor CPU in class CPU cannot be applied to given types: required: float, float found: no arguments How to solve it? java constructor share|improve this question edited Jan 14 '15 at 18:30 Dmitry Minkovsky 7,69484269 asked Jan 17 '13 at 17:19 MichaĆ Tabor 1,33731024 add a comment| 3 Answers 3 active oldest votes up vote 12 down vote As the error is trying to tell you, you need to pass parameters to your base class' constructor. Add super(x, y); share|improve this answer answered Jan 17 '13 at 17:21 SLaks 540k9313461515 add a comment| up vote 4 down vote The final object needs to in initialize the super class using one of its con
This Site Careers Other all forums Forum: Java in General Need help with error "constructor in class cannot be applied to given types" poonam p patil Greenhorn Posts: https://coderanch.com/t/622062/java/java/error-constructor-class-applied-types 3 posted 2 years ago hello all, Please explain me the error https://teamtreehouse.com/community/constructor-gokart-in-class-gokart-cannot-be-applied-to-given-types in d following progrm.. class person { String name="no name"; public person(String nm){name=nm;} } class emp extends person { String empid="0000"; } public class emptest { public static void main(String args[]) { person p=new person("hello"); System.out.println(p.name); } } [Added code tags and formatting - please see UseCodeTags for cannot be details] javac emptest.java emptest.java:8: error: constructor person in class person cannot be applied to given types; class emp extends person required: String found no arguments reason: actual and formal argument lists differ in length Matthew Brown Bartender Posts: 4568 9 posted 2 years ago If you don't add a constructor to a class the compiler adds a no-arg constructor cannot be applied for you. So one is added to the emp class. All constructors call (one way or another) a superclass constructor. If you don't add an explicit call to one then the compiler adds one for you. So the code is equivalent to: class emp extends person { String empid="0000"; emp() { super(); } } But that means it's trying to call a superclass constructor with no arguments. But there isn't one - the person class constructor requires a String. What you've effectively done is say that all person objects must have a name provided. But then your emp objects - which are also person objects - don't provide a name. The compiler considers that an error. (By the way, to follow standard Java conventions class names really should be capitalised: Person, Emp and EmpTest). poonam p patil Greenhorn Posts: 3 posted 2 years ago Thanks for the help Matthew.. it resolved my error.. but still i have 1 doubt. class emp which extends person will invoke super() internally. Agreed ! But however constructor of class emp w
in class GoKart cannot be applied to given types Example.java public class Example { public static void main(String[] args) { System.out.println("We are going to create a GoKart"); GoKart kart = new GoKart(); System.out.printf("The GoKart color is %s\n", kart.getColor()); } } gives the following error: error.java ./Example.java:5: error: constructor GoKart in class GoKart cannot be applied to given types; GoKart kart = new GoKart(); ^ required: String found: no arguments reason: actual and formal argument lists differ in length 1 error Any idea what's wrong? Ken Alger Treehouse Staff Ken Alger Ken Alger Treehouse Staff 10mo ago Edited for code markdown 1 Answer STAFF Ken Alger Treehouse Staff Ken Alger Ken Alger Treehouse Staff 10 months ago Sebastiaan; Welcome to Treehouse! You are missing something in your kart creation line. If you recall from the course, and from the Task 1 instructions, when we create a new kart with new GoKart(), we need to input a parameter of type String. Conceptually this would be the color of the GoKart we are creating. So we could do something like: GoKart blueKart = new GoKart("blue"); Since you left out a color parameter in your item creation, it will give the above error. Post back if you are still stuck. Happy coding, Ken Sebastiaan van Vugt 440 Points Sebastiaan van Vugt Sebastiaan van Vugt 440 Points 10mo ago Thanks a lot. That's perfect. Posting to the forum is only allowed for members with active accounts. Please sign in or sign up to post. Our mission is to bring affordable, technology education to people everywhere, in order to help them achieve their dreams and change the world. Our Company About Us Contact Us Community Treehouse Stories Student Perks Treehouse Blog Affiliate Program Careers Topics HTML CSS Design JavaScript Ruby PHP WordPress iOS Android Development Tools Business Tracks