Q. What is static variable?
A static variable is shared by all instances of a class. It is also known as a class variable and it is declared with keyword ‘static’. Instances (objects) of the same class share a single copy of static variables.
class School
{
int rollno;
String section;
String name;
static String schoolName ="InspireSkills Edu";
// constructor
School(int r, String s, String n){
rollno = r;
section = s;
name = n;
}
void display ()
{
System.out.println(rollno + " " + section + " " + name + " " + schoolName);
}
public static void main(String args[])
{
School ob1 = new School(1, "A", "Mukesh");
School ob2 = new School(2, "B", "Aryan");
ob1.display();
ob2.display();
}
}
Q. What is the static method?
When a method defines with static keyword before a data type is called a static method.
class Example
{
public static void print()
{
System.out.println(“This is a static method”);
}
}
Q. What is Garbage collection?
When an object is no longer required, java automatically free the memory space is known as Garbage Collection.
Q. What is java package?
A java package is a Java language element used to group related classes under a common name. Packages can be nested inside one another. The main package is java in java language
Q. What is escape sequence?
The combination of characters is preceded by a code extension. It comes with the backslash (\).For example, \n stands for new line; even though it looks two characters, Java treats them as one character with ASCII code of 10. Escape sequence, being a single character, should be put within single quotes.
Escape Sequences
| |
Escape Sequence
|
Description
|
\t
|
Insert a tab in the text at this point.
|
\b
|
Insert a backspace in the text at this point.
|
\n
|
Insert a newline in the text at this point.
|
\r
|
Insert a carriage return in the text at this point.
|
\f
|
Insert a form feed in the text at this point.
|
\'
|
Insert a single quote character in the text at this point.
|
\"
|
Insert a double quote character in the text at this point.
|
\\
|
Insert a backslash character in the text at this point.
|
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