'constructor in UML sequence diagram

what is the meaning of the following sequence diagram and exactly the constructor(that is represented as a create object)?

enter image description here

constructorumlsequence-diagram


Solution 1:[1]

The message's name "Class B()" is wrong : it should be "create".
Is that what confusing you ?

Solution 2:[2]

Chriss, hopefully you've figured it out by now.

Here is an example in Java:

Main.java

package com.example.umlquestion;

// (e.g. your application that makes and uses an instance of ClassA)
public class Main {
    public Main() {
        // this calls ClassA's constructor, which will then call ClassB's constructor
        private ClassA instanceA = new ClassA(); 
        // ...
    }
}

ClassA.java

package com.example.umlquestion;

public class ClassA  {
    private ClassB instanceB;
    public ClassA() {
        instanceB = new ClassB();
        // ...
    }
    // ...
}

ClassB.java

package com.example.umlquestion;

public class ClassB  {
    public ClassB() {
        // ...
    }
    // ...
}

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Sylvain H.
Solution 2 General Grievance

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