3 Years Experience Top Core Java Interview Questions Part 2

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3 or 5 or 7 Years Experience Core Java Interview Questions

Top Java Interview Questions and Answers :

There are two classes Class A,Class B,Class B extends Class A ? Which method "create()" method will be called ?
Class A {
public void create(){
System.out.println("Class A create method called");
}
}
Class B extends Class A {
public void create(){
System.out.println("Class B create method called");
}
}
Public static void main(String[] args){
ClassA b = new ClassB();
b.create();  which create method will be called A or B ?
}

2.Write Java code which explains "wait()" ,"notify()","notifyall()" ?

Top Java Interview Questions and Answers :

3.Write a Java program to "reverse a string" ?
4.How can you implement OOPS concept using Java code ?
5.What is the difference between "FileReader" and "FileStream" ?
6.Explain "sleep()" & "yield()" method ?
7.What is the difference between "vector" and "arrays" ?
8.Write your own Java code for vector  add() method ?
9.When the "Static block" will be called ? "A" or "B" will be called first / class loading ?
Class staticExample {
Public static int val = 0;  B
Static {
Val = 100;
}
Public static void main(String[] args){  A
staticExample se = new staticExample ();
}
10.At what level ,the lock is obtained for a "synchronized static method" and "synchronized instance method" ?

11.Write a simple Java program for "producer -- consumer" problem ?
12.Can we catch Error ,RuntimeException ?
13.Is Java "pass by value" or "pass by reference" ? What is the output 10 or 20 ?
Int x = 10 ;
calc(x);
system.out.println(x);

calc(int x) {
x = 20;
}
14.How many stack frames will be created in the following program ?

Display(){
Display1();
Display2();
}

3 or 5 or 7 Years Experience Core Java Interview Questions

Top Java Interview Questions and Answers :

15.Where the static variables,instance variables,local variables stored ? Heap or Stack ?
16.Explain garbage collection ?
17.What is unreachable object ?
18.What are the access modifiers for class and methods ?
19.What is the difference between Abstract class and Interface ? When to use what ?
20.What happens if a super class does not implements serializable whereas subclass implements serializable ?


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