Diamond problem

Question

how to solve diamond problem in java? can anyone explain with an example??

Answer 1

tschodt wrote:
dpxqb wrote:
... I "think" the real diamond problem happens when if you buy two libraries from different vendors. and then due to bad luck, you get a diamond name clashThese two vendor libraries will provide classes in two different package hierarchies.
There is no name clash.I do not see how different package hierarchies would help?
If that were true, there would really not be a problem. Rather, you can just type a little more (the fully qualified canonical names)? The diamond problem is special because canonical names cannot be used to show which interface's Foo class to use?
package CompanyA;
public interface InterA {
  public static class Foo {
    public Foo() { println("InterA::[constructor] Foo"); }
package CompanyB;
public interface InterB {
  public static class Foo {
    public Foo() { println("InterB::[constructor] Foo"); }
public class Main {
  public static void main(String[] args) {
    AAA.Foo f = new AAA.Foo();  // error! <-- how can i use canonical names here?
    // reflective work-around
    Class[] cA = AAA.class.getInterfaces()[0].getClasses();
    cA[0].newInstance();
    Class[] cB = AAA.class.getInterfaces()[1].getClasses();
    cB[0].newInstance();
    public static class AAA implements CompanyA.InterA, CompanyB.InterB {
      public void x() { }
}Other than the reflective work-around, I don't see how to tell Java which Foo class to use. Again, I really don't know if what I say is true, so please set me straight if I am making a mistake. thanks.