Wednesday, 14 August 2013
To deserialize an object from file, first get the serialized data from the file using FileInputStream. In case if you want to know how to serialize an object to file please check this article serialize an object to a file. Pass the FileInputStream object through ObjectInputStream. Now, get the object from ObjectInputStream using the API readObject().
Example:
Suppose we have a file named sampleClass.ser which contains the data of a serialized object of class SampleClass. Please check this post to create this file. Where SampleClass is a normal pojo class with 4 variables, among which 1 is declared as transient, that means, protected from serialization.
Wednesday, 14 August 2013 3 Read more »
Sunday, 11 August 2013
abstract: |
When a class contains any abstract method, it must be declared as abstract.
An abstract class cannot be
final.An abstract method cannot be
final, static nor native.
Code:
package com.interview.question.java;
abstract class SampleAbstractClass {
/**
*
* Sample abstract class.
*
* @author http://interviewquestionjava.blogspot.com
*
*/
// Sample abstract method.
public abstract void sampleabstractmethod() ;
public void sampleNormalMethod(){
System.out.println("SampleAbstractClass.sampleNormalMethod()");
}
}
public class TestAbstractClass{
/**
*
* Sample class to call SampleAbstractClass.
*
* @author http://interviewquestionjava.blogspot.com
*
*/
public static void main(String[] args) {
SampleAbstractClass objSampleAbstractClass = newSampleAbstractClass() {
@Override
public void sampleabstractmethod() {
System.out
.println("TestAbstractClass.main(...).new SampleAbstractClass() {...}.sampleabstractmethod()");
}
};
objSampleAbstractClass.sampleabstractmethod();
}
}
Output:
TestAbstractClass.main(...).new SampleAbstractClass() {...}.sampleabstractmethod()
Sunday, 11 August 2013 6 Read more »
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