Programming |
In the Bitwise operator, if the first operator evaluates to true in OR (|) and False in AND (&) then the second expression will also be evaluated. But, in Logical Operator, if the first operand evaluates to true in OR (|) and False in AND (&) then the second expression will not be evaluated.
The >> operator is also called Arithmetic Shift Right which carries a signed bit when shifting right. The >>> operator is also called a logical shift right which does not carry any signed bit.
No, shift operators can be applied only to integer or long types
They are discarded.
In case of signed left shift >> the new bits are set to zero. But in case of signed right shift << it takes the value of most significant bit before the shift that is if the most significant bit before shift is 0 it will introduce 0, else if it is 1, it will introduce 1.
Operators are special symbols used in expressions. The following are the types of operators:
Yes
No
During compilation, the values of each case of a switch statement must evaluate to a value that is an integer or compatible with an integer value.
Yes, for statement can loop indefinitely. Here’s the code: for(;;) ;
A break statement results in the termination of the statement to which it applies (switch, for, do, or while). A continue statement is used to end the current loop iteration and return control to the loop statement.
A while loop checks at the beginning of a loop to see whether the next loop iteration should occur. A do-while statement checks at the end of a loop to see whether the next iteration of a loop should occur. A do loop will always execute at least once.
Variables are locations in memory that can hold values. Before assigning any value to a variable, it must be declared.
Java has three kinds of variables namely:
Instance Variable: Local variables are used inside blocks as counters or in methods as temporary variables and are used to store information needed by a single method.
Local Variable: Instance variables are used to define attributes or the state of a particular object and are used to store information needed by multiple methods in the objects.
Class Variable: Class variables are global to a class and to all the instances of the class and are useful for communicating between different objects of all the same class or keeping track of global states.
A literal represents a value of a certain type. There are different types of literals namely number literals, character literals, boolean literals, string literals, etc.
An array is an object that stores a list of homogeneous datatype elements.
Array variable indicates the type of object that the array holds. Ex:
int intArr[];
String stringArr[];
a, b and d are the correct way of declaring an array.
Static variables are shared by all instances of a class.
Final variable’s value cannot be changed. It becomes a constant.
";"";"Here is a list of one liner Question and Answers which will be helpful in interviews.";"Administrator";"Java";"2020-03-31 00:00:00+00";"''" 31;"Interview Question and Answers Part 2";"The argument type is a String array
No, the program will not compile if we do so.
Yes, by method overloading it can be done.
We need them because:
public: The method can be accessed outside the class/package.
static: this method is static so that we don’t need to create an instance.
void: Your application need not return a value, as the JVM launcher would return the value when it exits.
main(): This is the entry point for the application. The JVM is written to name this method as main().
String args[] will help the program to receive command-line arguments. JVM will create an array of String and will store the received arguments inside String args[].
Yes, the main method can be declared final, in addition to being public static.
Print args.length. It will print 0. That means it is empty. But if it would have been null then it would have thrown a NullPointerException on attempting to print args.length.
The String array is empty. It does not have any element. This is unlike C/C++ where the first element by default is the program name.
It is empty. But not null.
Print args.length. It will print 0. That means it is empty. But if it would have been null then it would have thrown a NullPointerException on attempting to print args.length.
Yes, an application can have multiple classes having the main method, but while starting the application, mention the class name which is to be run i.e the class name which is to be executed. The JVM will only look for the main() method in that class which you have mentioned. Hence there will not be any conflict amongst the multiple classes having the main method.
It is used to create or increase the size of the JVM memory. java -Xms64m -Xmx256m HelloWorld. Requesting for min 64MB and max 256MB.
// Is this a comment?
int a=10;
Integer a1=(Integer)a;
a1=null;
a=a1;
System.out.println(a);
Because java uses the Unicode system rather than the ASCII code system. \u0000 is the lowest range of Unicode system.
In declaration, we just mention the type of the variable and its name. We do not initialize it.
But defining means declaration + initialization.
For e.g. String s; is just a declaration while String s = new String ("abcd"); Or String s = "abcd"; are both definitions.
While defining method, variables passed in the method are called parameters. While using those methods, values passed to those variables are called arguments.
At the time of JVM shut down.
/ (Division) and % (Modulus) can result in the throwing of an ArithmeticException.