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Thread: private constuctor

  1. #1
    Junior Member
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    Default private constuctor

    What is exact use of private constuctor?

  2. #2
    Crazy Cat Lady KevinWorkman's Avatar
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    Default Re: private constuctor

    What do you think it is? What does a private constructor mean?
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  3. #3
    Join Date
    Feb 2013
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    Default Re: private constuctor

    There are several uses for private constructors but the best way for you to understand them is to start by thinking about what public constructors can do. For example, public class A has a private field variable b (along with its getter) and a public constructor. Public class B imports A and tries to get the value of b through the getter. Suppose the constructor was changed to private. What happens when public class B tries to use the getter to get the value of b? If it helps to see the situation in code:

    public class A {
         private int b;
         public A () {
             this.b = b;
         public A(int d) {
             this.b = d;
         public int getB() {
             return b;
    import blah.blah.A;
    public class B {
         public static void main (String[] args) {
             A _a = new A();
             int c = _a.getB();

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