Hello guys, welcome to lingarajtechhub.com . Today we are going to discuss the display properties of Students using class & object in the oops concept.
Code:
package com.Student_oops_class_obj.java; public class Student { String name,address; int roll; void std_Input() { name="sonalin sahoo"; address="dhenkanal"; roll=38; } void std_Display() { System.out.println("student name:"+name); System.out.println("student address:"+address); System.out.println("student roll:"+roll); } public static void main(String[] args) { Student s=new Student(); s.std_Input(); s.std_Display(); } }
Line-1:
- package com.Student_oops_class_obj.java;
It is a java package , this package is created in a java project and it contains classes inside the package.
Line-2:
- public class Student
“Student” is the class-name , class is a template used to create objects & class-name first letters must be capital. It is public means we can use this outside of the package.
Line-3:
- String name,address
Here the name , Address are the variables and String is a class. It is not a data type.
Line-4:
- int roll
Here roll is the variable and int (Integer) is a data type of the variable.
Line-6:
- void std_Input() {
name=”sonalin sahoo”;
address=”dhenkanal”;
roll=38;
}
In this line we create a method whose name takes std_input() where store properties values.
Line-11:
- void std_Display() {
System.out.println(“student name:”+name);
System.out.println(“student address:”+address);
System.out.println(“student roll:”+roll);
}
In this line we create a method whose name takes std_display().system is a predefined class .Out is a static variable of type printstream present in system class. Println shows the result.
Line-17:
- public static void main(String[] args)
It is a main method in which we can execute a program.
- public : It is an access modifier. The main() is public because we can access main() outside of the class , if main() can’t be public then JVM(Java Virtual Machine) can’t be called main() & code can’t be executed.
- Static : static is a keyword in which the main method has to be static in which JVM can load the class into memory and call the main method without creating an instance.
- Void : Void is a data type. It means no return type.
- main(): Main is a function.
- String [] args : string means collection of characters ,String[] args represents a collection of Strings that are separated by a space and can be typed into the program on the terminal directly.
Line-18:
- Student s=new Student();
Here “s” is the instance variable.It is created to assign the default values to the instance variables of the class when an object is created.
Line-19:
- s.std_Input()
“s” is the instance variable which is created. “ .” is the connector .std_Input() is a method where our input values will be stored.
Line-20:
- s.std_Display()
“s” is the instance variable which is created. “ .” is the connector .std_Display() is a method where our result will be stored.