Undefined type compile error when trying to define multiple constructors

Question

main class->>>

public class scoreMain { public static void main(String[] args) { // Football Score board Score scoreObject = new Score(); Score scoreObject1 = new Score(1); Score scoreObject2 = new Score(1,2); Score scoreObject3 = new Score(1,2,3); } }

and constructor class -->>>

public class Score { public void Score() { Score(0,0,0); } public void Score(int x) { Score(x,0,0); } public void Score(int x,int y) { Score(x,y,0); } public String Score(int x,int y,int z) { Score(x,y,z); return String.format("%d/%d%d",x,y,z); } }

but it shows error when creating objects ... the constructor score(int) is undefined the constructor score(int int ) is undefined the constructor score(int int int ) is undefined

Community · Accepted Answer · 2017-05-23 12:15:08Z

Constructors do not return anything. Not String nor void or anything else. You should just change the constructors as follows:

public class Score { public Score() { this(0,0,0); } public Score(int x) { this(x,0,0); } public Score(int x,int y){ this(x,y,0); } public Score(int x,int y,int z) { Score(x,y,z); // Not sure what's this - you can't do a recursive constructor call. Doesn't make any sense return String.format("%d/%d%d",x,y,z); // Remove the return statment. } }

Also notice to not only not do a return on any value, but also you have a recursive call for the constructor in the last overloaded constructor. It doesn't make any sense and won't work.

BTW - the correct way of overloading constructors is by calling this() inside the overloads and have only one implementation. Look at this question for further details.

Fortega · Accepted Answer · 2016-02-04 13:25:56Z

In your code, there are only methods, no constructors. Constructors have no return type.

Example:

public class Score { public Score() { this(0,0,0); } public Score(int x) { this(x,0,0); } public Score(int x,int y) { this(x,y,0); } public Score(int x,int y,int z) { //?? //constructors cannot return anything! //return String.format("%d/%d%d",x,y,z); } }

Meegoo · Accepted Answer · 2016-02-04 12:24:42Z

Also, to invoke other constructor of the same class, you should use keyword this, not class name.

So, first constructor would look like this

public void Score() { this(0,0,0); }

Also, what you have here is a method, not a constructor. Constructors don't have return types

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