Sun Certified Java Programmer (SCJP) Exam Tutorials

Witscale's SCJP tutorial This tutorial is in form of study notes. Topics are well described with required explanation and code examples.
SCJP tutorial

SCJP Exam Objectives, Java Developer SCJP Resources

Submitted by Andr on Tue, 10/26/2010 - 15:48

SCJP

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Section 1: Declarations, Initialization and Scoping

Whan happens when you compile and run the following code?

Submitted by Steven on Sun, 09/05/2010 - 16:35

SCJP
SCJP

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public class Q5 {
 public static void main(String args[]){
  int i = 10;
  int j = 12;
  i+=++j;
  System.out.println(i);
 }
}

a. Program will print 13
b. Program will print 23
c. Program will print 22
d. Program will print 12

Priority of thread can not be changed, OS decides which thread to run and when.

Submitted by Steven on Sun, 09/05/2010 - 16:33

SCJP
SCJP

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Priority of thread can not be changed, OS decides which thread to run and when.

A. True
B. False
Answer:

B false. Thread priority can be set using setPriority method of Thread class. The way Java schedules thread is platform dependent, so varies from one platform to another.

What will be the output of following program?

Submitted by Steven on Sun, 09/05/2010 - 16:32

SCJP
SCJP

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public class Q3{
 
 public static void main(String args[]){
  try{
   Demo d = new Demo();
   d.method1();
   System.out.println("Main Completed");
  }catch(Exception e){}
 }
}
 
class Demo{
 
 public void method2(){
  throw new ArrayIndexOutOfBoundsException();
 }
 
 public void method1(){
  try{
   method2();
  }catch(NullPointerException ae){
   System.out.pri

What will be output of following program?

Submitted by Steven on Sun, 09/05/2010 - 16:31

SCJP
SCJP

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public class Q2 {
 static int class_var = 2;
 
 public Q2(){
  class_var = 5;
 }
 public static void main(String args[]){
  System.out.println(class_var);
 }
}