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Object Oriented Programming Articles
Page 584 of 589
Can you use both this() and super() in a constructor in Java?
No, you cannot have both this() and super() in a single constructor.
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Why can't we override static methods in Java?
Overloading is the mechanism of binding the method call with the method body dynamically based on the parameters passed to the method call.Static methods are bonded at compile time using static binding. Therefore, we cannot override static methods in Java.
Read MoreWhat are tokens in Java?
Java tokens are smallest elements of a program which are identified by the compiler. Tokens in java include identifiers, keywords, literals, operators and, separators.
Read MoreCan a Java array be declared as a static field, local variable or a method parameter?
We can declare an array as a local variable or method parameter but, an array cannot be static. Example public class Test{ public void sample(){ static int[] myArray = {20, 30}; System.out.println(); } public static void main(String args[]){ Test t = new Test(); t.sample(); } } Error C:\Sample>javac Test.java Test.java:3: error: illegal start of expression static int[] myArray = {20, 30}; ^ 1 error
Read MoreCan access modifiers be used for local variables in Java?
Yes, a local variable can be public, private, protected or default.
Read MoreWhat is the difference between a String object and a String literal in Java?
When the String literal used to create String, JVM initially checks weather String with the same value in the String constant pool, if available it creates another reference to it else it creates a new object and stores it in the String constant pool.In case of an object, each time you instantiate the class a new object is created given value irrespective of the contents of the String constant pool.
Read MoreWhat is the difference between a String object and a StringBuffer object in java?
String class is immutable once you create an object of string you can modify its data.The StringBuffer class is immutable, once you create a StringBuffer object you can change/modify the contents of it.This class provides various methods to manipulate its data such as append(), delete(), insert() etc.
Read MoreWhat are the different build tools in Java?
"On a mean, a developer spends a considerable quantity of your time doing mundane tasks compiling the code, packaging the binaries, deploying the binaries to the checkserver, testing the changes," copying the code from one location to another. To automate and simplify these tasks we can use build tools like Ant, Maven, Gradle etc.
Read MoreIs it necessary that a try block should be followed by a catch block in Java?
Not necessarily catch, a try must be followed by either catch or finally block. Example import java.io.File; public class Test{ public static void main(String args[]){ System.out.println("Hello"); try{ File file = new File("data"); } } } Output C:\Sample>Javac Test.java Test.java:5: error: 'try' without 'catch', 'finally' or resource declarations try{ ^ 1 error
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