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R4R --->Java-->Core Java -->Core Java Interview Objective Questions And Answers
Core Java Interview Questions And Answers
Page 1
Question :What is difference between jdk1.4 and jdk1.5?
Give Your Answer
Answer:Following is added into jdk1.5 .which was not into jdk1.5:
Java Language Features
Generics
Enhanced for Loop
Autoboxing/Unboxing
Typesafe Enums
Varargs
Static Import
Metadata (Annotations)
Virtual Machine
Class Data Sharing
Garbage Collector Ergonomics
Server-Class Machine Detection
Thread Priority Changes
Fatal Error Handling
High-Precision Timing Support
So many other new features has been added.
User Name:Rajesh Kumar
Date:19.01.10
Answer:jdk 1.5 have been added new features which was not into jdk1.4
Java Language Features
Generics
Enhanced for Loop
Autoboxing/Unboxing
Typesafe Enums
Varargs
Static Import
Metadata (Annotations)
Virtual Machine
Class Data Sharing
Garbage Collector Ergonomics
Server-Class Machine Detection
Thread Priority Changes
Fatal Error Handling
High-Precision Timing Support
User Name:Rajesh Kumar
Date:19.01.10
Question :Can a java source file hava more than one public classes?
Give Your Answer
Answer:yes
User Name:arti
Date:16.01.09
Answer:No! A java source file can hava only one public class and the name of that source file must be the same as of the public class name.
User Name:Jalees
Date:16.01.09
Question :What is output of following code
package r4r.co.in.core.java;
public class HelloWorld {
static int i = 0;
public static void main(String args[]) {
System.out.println(i);
display();
HelloWorld h=new HelloWorld();
h.display();
}
void display(){
int i=0;
i=90;
System.out.println(i);
}
}
Give Your Answer
Answer:The program will give an error : a non-static method display() can not be referenced from a static context.
User Name:Jalees
Date:16.01.09
Question :What is output of following code
package r4r.co.in.core.java;
public class HelloWorld {
static int i = 0;
public static void main(String args[]) {
System.out.println(i);
HelloWorld h=new HelloWorld();
h.display();
}
void display(){
int i=0;
i=90;
System.out.println(i);
}
}
Give Your Answer
Answer:Output of the program :
0
90
User Name:Jalees
Date:16.01.09
Question :What is output of following code
package r4r.co.in.core.java;
public class HelloWorld {
static int i = 0;
public static void main(String args[]) {
System.out.println(i);
display();
HelloWorld h=new HelloWorld();
h.display();
}
static void display(){
int i=0;
i=90;
System.out.println(i);
}
}
Give Your Answer
Answer:Output of the program :
0
90
90
User Name:Jalees
Date:16.01.09
Answer:0
90
90
User Name:vasanth
Date:09.02.09
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Core Java Objective Questions And Answers
Core Java Objective Questions And Answers
Core Java Subjective Questions And Answers
Core Java Subjective Questions And Answers
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R4R --->Java-->Core Java -->Core Java Interview Objective Questions And Answers
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