The static keyword is mainly used for memory management only.
The static keyword can be used with.
- Variables
- Methods
- Block
- Nested Class
The property of the static is shared among all the objects.
class Student
{
int rno;
String name;
static String college ="JPS";
Student(int r, String n)
{
rno = r;
name = n;
}
void show ()
{
System.out.println(rno+" "+name+" "+college);
}
}
class StaticVariable
{
public static void main(String args[])
{
Student s1 = new Student(101,"Tanmay");
Student s2 = new Student(102,"Shivam");
s1.show();
s2.show();
}
}
Output:
101 Tanmay JPS
102 Shivam JPS
- Program of the counter with Static Variable.
class StaticCounter
{
static int count=0;
StaticCounter()
{
count++;
System.out.println(count);
}
public static void main(String args[])
{
StaticCounter c1=new StaticCounter();
StaticCounter c2=new StaticCounter();
StaticCounter c3=new StaticCounter();
}
}
Output:
1
2
3
- Static Method :
class Student
{
int rno;
String name;
static String school = "JPS";
static void change()
{
school = "DPS";
}
Student(int r, String n)
{
rno = r;
name = n;
}
void show()
{
System.out.println(rno+" "+name+" "+school);
}
}
class StaticMethod
{
public static void main(String args[])
{
Student.change();
Student s1 = new Student(101,"Tanmay");
Student s2 = new Student(102,"Sanyam");
Student s3 = new Student(103,"Sanskar");
s1.show();
s2.show();
s3.show();
}
}
Output:
101 Tanmay DPS
102 Sanyam DPS
103 Sanskar DPS
- Static Block :
class StaticBlock
{
static
{
System.out.println("static block");
}
public static void main(String args[])
{
System.out.println("Hello main");
}
}
Output:
static block
Hello main