Two constructors

Question

As I remember I can use first constuctor in second constuctor  but there is mistake on bold line  could you help me to correct it     public FaceExtAdditionCanvas         profileImage setSize IMAGE WIDTH  IMAGE HEIGHT       add profileImage  getWidth     2 0 - IMAGE WIDTH   2 0  IMAGE MARGIN          public FaceExtAdditionCanvas GImage image       profileImage image        this FaceExtAdditionCanvas

User · Answer

To call one constructor from another you need to use this   and you need to put it first   In your case the default constructor needs to call the one which takes an argument  not the other ways around

User · Answer

Let s  just as example   public class Test       public Test             System out println  NO ARGS               public Test String s            this            System out println  1 ARG               public static void main String args                  Test t   new Test  s              It will print   gt  gt  gt  NO ARGS  gt  gt  gt  1 ARG   The correct way to call the constructor is by   this

User · Answer

The first line of a constructor is always an invocation to another constructor  You can choose between calling a constructor from the same class with  this       or a constructor from the parent clas with  super        If you don t include either  the compiler includes this line for you  super

[java] Two constructors

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