instance variable java

1A variable declared inside the class is called instance variable. Value of 
2instance variable are instance specific.
3public class InstanceVariableDemo
4{
5   // instance variable declared inside the class and outside the method
6   int c;
7   public void subtract()
8   {
9      int x = 100;
10      int y = 50;
11      c = x - y;
12      System.out.println("Subtraction: " + c);
13   }
14   public void multiply()
15   {
16      int m = 10;
17      int n = 5;
18      c = m * n;
19      System.out.println("Multiplication: " + c);
20   }
21   public static void main(String[] args)
22   {
23      InstanceVariableDemo obj = new InstanceVariableDemo();
24      obj.subtract();
25      obj.multiply();
26   }
27}

1package Edureka;
2 
3import java.util.Scanner;
4 
5public class Student
6{
7 
8public String name;
9 
10private int marks;
11 
12public Student (String stuName) {
13name = stuName;
14}
15public void setMarks(int stuMar) {
16marks = stuMar;
17}
18 
19// This method prints the student details.
20public void printStu() {
21System.out.println("Name: " + name );
22System.out.println("Marks:" + marks);
23}
24 
25public static void main(String args[]) {
26Student StuOne = new Student("Ross");
27Student StuTwo = new Student("Rachel");
28Student StuThree = new Student("Phoebe");
29 
30StuOne.setMarks(98);
31StuTwo.setMarks(89);
32StuThree.setMarks(90);
33 
34StuOne.printStu();
35StuTwo.printStu();
36StuThree.printStu();
37 
38}
39}
40

1java decleartion 
2
3int a, b, c;         // Declares three ints, a, b, and c.
4int a = 10, b = 10;  // Example of initialization
5byte B = 22;         // initializes a byte type variable B.
6double pi = 3.14159; // declares and assigns a value of PI.
7char a = 'a';        // the char variable a iis initialized with value 'a'

1A variable declared inside the class
2  is called instance variable. Value of 
3instance variable are instance specific.
4public class InstanceVariableDemo
5{
6   // instance variable declared inside the class and outside the method
7   int c;
8   public void subtract()
9   {
10      int x = 100;
11      int y = 50;
12      c = x - y;
13      System.out.println("Subtraction: " + c);
14   }
15   public void multiply()
16   {
17      int m = 10;
18      int n = 5;
19      c = m * n;
20      System.out.println("Multiplication: " + c);
21   }
22   public static void main(String[] args)
23   {
24      InstanceVariableDemo obj = new InstanceVariableDemo();
25      obj.subtract();
26      obj.multiply();
27   }
28}