# 31 Constructor | Static Keyword | Init & Static Block | Tutorial In Java Tutorials | Java Basic смотреть онлайн

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Static Keyword in Java: -
In Java, static keyword is mainly used for memory management.
Static keyword can be used with: -
1. Data member
2. Member function
3. Block
4. Nested class.

Static keyword can NOT be used with: -
1. Class
2. Constructor
3. Interface
4. Local variable.
#Example Without static: -
package androjava;

public class Placement {

String companyname = "HCL";
String collegename = "Kalinga University";



String s_name;
int s_id,s_age,s_sal;

Placement(int sid,String sname,int sage,int ssal)
{

s_id=sid;
s_name=sname;
s_age=sage;
s_sal=ssal;


}

void show(){

System.out.println("\nCollege Name : "+collegename);
System.out.println("Company Name : "+companyname);
System.out.println("Student ID : "+s_id);
System.out.println("Student Name : "+s_name);
System.out.println("Student Age : "+s_age);
System.out.println("Student Monthly Salary : "+s_sal);


}

public static void main(String args[])

{

System.out.println("*****Kalinga University Student Placement*****");

Placement p1=new Placement(9211,"Amit",24,40000);
Placement p2=new Placement(9233,"Sumit",25,30000);
Placement p3=new Placement(9243,"Ronit",28,45000);
System.out.println();


p1.show();
p2.show();
p3.show();


}


}

#Example With static: -

package androjava;

public class Placement {

static String companyname = "HCL";
static String collegename = "Kalinga University";



String s_name;
int s_id,s_age,s_sal;

Placement(int sid,String sname,int sage,int ssal)
{

s_id=sid;
s_name=sname;
s_age=sage;
s_sal=ssal;


}



void show(){

System.out.println("\nCollege Name : "+collegename);
System.out.println("Company Name : "+companyname);
System.out.println("Student ID : "+s_id);
System.out.println("Student Name : "+s_name);
System.out.println("Student Age : "+s_age);
System.out.println("Student Monthly Salary : "+s_sal);


}

public static void main(String args[])

{

System.out.println("*****Kalinga University Student Placement*****");

Placement p1=new Placement(9211,"Amit",24,40000);
Placement p2=new Placement(9233,"Sumit",25,30000);
Placement p3=new Placement(9243,"Ronit",28,45000);
System.out.println();


p1.show();
p2.show();
p3.show();

}
}

Static Data Member and Non static Data member:-
1. Static data member represents the property of class whereas non-static data member is representing property of object.
2. In case of static data member memory is allocated in class area at class loading time only once and this memory is shared by multiple objects. It means single copy is created in memory in case of static data member.
3. In case of non-static data member memory is allocated in each objects separately (In heap area).It means separate copy is created in each objects in case of non static data member.
4. If a data is common for all objects then make it static otherwise non static.
5. As we know that static represents the property of class that’s why the standard approach to call the static data member is with class name. and non static with object reference


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