OCPJP (SCJP 1.6)

public class PassByReference { public PassByReference() { List<String> list = new ArrayList<String>(); list.ad...

[TIP] Avoiding null pointer exception while comparing strings Most of the time in our code we compare a String variable with a constant stri...

1: import java.io.File; 2: import java.io.IOException; 3:   4: /** 5: * Created by IntelliJ IDEA. 6: * User: Own...

1: public class StringInstanceOfTest { 2: public static void main(String[] args) { 3: String s = null; 4: ...

A locked object has be unlocked appropriately in order to avoid dead locks. This can be achieved by keeping the locking mechanism in the try...

Connecting a method call to method body is called as binding. If the binding happens during the compile time then it is called early bindin...

Which of these must be true if you execute the following command? java –classpath xyz hello.my.App Choose at least one answer. a. The def...

What is the result of compiling and running the given code? public class Regex1 { public static void main(String[] args){ String ...

What will happen when you attempt to compile and run the following code? public class WrapTest { public static void main(String[] arg...

Which of the following are true about the File class ? Select two choices. A. You can perform file I/O operations using its methods. B. Yo...

Consider the following code statement. Float f = new Float(3.14); Choose one answer a. f.parseFloat("2.718") b. f.valueOf("3...

What will happen when you attempt to compile and run the given code? public class StringEquals { public static void main(String[] arg...

What is the result of compiling and running the given code? (Choose 1 Answer) import java.text.NumberFormat; import java.text.ParseExcepti...

What is the result of attempting to compile and run the given code? import java.util.*; public class ScannerDelimiter2 { public static...

What is the result of compiling and running the given code? import java.util.Scanner; public class ScannerDelimiter { public static v...

What is the result of compiling and running the given code? public class NullPointerString { public static void main(String[] args){ ...

Which of the following methods are defined by the Serializable interface? Options : A. readObject() and writeObject() B. readExternal() a...

Which code fragment produces the same output as the following code? for ( int i=0; i< 10; i++) System.console().printf(" %d ...

Which of the following classes define the printf() method? Select two choices. Options : A. Console B. PrintWriter C. Formatter D. Printer...

Which of the following are true about the readPassword() method of the Console class? Select two choices. Options : A. Its return type is...

What will be the result of attempting to compile and run the following program? public class CustomThread extends Thread{ public void ...

Before which of the following can the "synchronized" keyword be placed, without causing a compilation error? Options : A. Class...

What would be the result of an attempt to compile and run the following code? class TwoThreadsDemo extends Thread { public TwoThreadsDe...

What would be the result of an attempt to compile and run the following code? Choose one answer. public class OrderedThread { public st...

What will happen when you attempt to compile and run the following code? public class TestThread extends Thread{ public static void ...

Which of the following statements are true about the sleep method of Thread class? Select two choices. Options : A . A thread releases any...

What will happen when you attempt to compile and run the following code? public class TestThread extends Thread{ public static void ...

Which of the following statements are true about synchronization?  (Select two choices) Options : A. Static methods cannot be synchronize...

Given that a static method doIt() in the Work class represents work to be done, which of the following blocks of code will succeed in start...

There are three Threads trying to invoke a method of an object. This method is a synchronized method to prevent conflict between Threads. Wh...

What will be the result of an attempt to compile and run the following program? (Choose 1 Answer) public class ThreadPrediction { publ...

What will be the result of an attempt to compile and run the following program? (Choose 1 Answer) public class ThreadPrediction { publ...

What will be the result of an attempt to compile and run the following program? (Choose 1 Answer) public class ThreadPrediction { publ...

Which of the following lines will not compile ?? Choose Two. 1: public class Question1 { 2: public Question1() { 3: } 4: ...

After installing JDK (download JDK here ) we have to set path and classpath variables. Path variable holds a the path to the executable fil...

This tutorial is a continuation to my earlier tutorial about configuration of Eclipse. In this one I show you how to compile and execute cod...

Eclipse IDE is widely used in working environments. Most professional prefer to use Eclipse as it is considered to be industry standard IDE....

Q :What is the difference between SCJP 1.5 vs SCJP 1.6? Ans :  SCJP 1.6 = SCJP 1.5 +  New API Contents (NavigableSet, NavigableMap, Garbage...

This is a raw list, I collected it from various websites including javaraunch.com. I am yet to refine it. It contains lot of material which ...

So many people had sent me mails regarding the books to be followed for SCJP 1.6. My sincere suggestion to them was to follow “ SCJP Sun Cer...

After you setup JCreator the next task is to write a small code to verify the setup. This section will help you on writing java , compiling ...

Which ever blog you go, whatever material you read every one will suggest you to write small programs while reading for SCJP. Forget about t...