Answer Posted / jag bhushan

yes,
we can have constructor in abstract class.
But we can not make instance of the abstract class.
instead we can make a reference to that abstract class.
and when we make a new object of the class which extends
the abstract class, the constructor of abstract class get
called.

see the code for example:

public abstract class TestAbstract {

TestAbstract(){

System.out.println("...in abstract class'
constructor");
}

public abstract void showAbstract();
public void show(){
System.out.println("...in show");
}
}


public class Test extends TestAbstract{
public static void main(String[] args) {

TestAbstract ta = new Test(); //
constructor call
ta.showAbstract();
ta.show();

}

public void showAbstract() {
System.out.println("...in showAbstract");

}

}

What is super in java?

769

---

What is linked hashmap and its features?

775

---

What are constructors in java?

762

---

What is a return in java?

786

---

Which method you will use to create a new file to store some log data. Each time a new log entry is necessary, write string to the file in java ?

912

---

What is threaded programming and when is it used? : Java thread

755

---

Can we serialize arraylist in java?

768

---

What is anti pattern in programming?

724

---

What is difference between path and classpath variables?

803

---

What is the difference between final, finally and finalize() in java?

783

---

What are the main features of java?

736

---

What is object of class in java?

826

---

Explain covariant method overriding in java.

780

---

How do you bind variables?

769

---

Why we use set in java?

762

---