What is non static variable in java (Best Example)

Non Static variable in java: – These Variable a created outside the method but inside the class without the static keyword.

• There are also called instance variables.
• If not initialize non-static variable depend on variable automatically default value can be stored.

Note 1: – Without creating an object non-static members cannot access and hence the below program an error.

Non Static variable in java best Example

public class A  {
	int x=10;
	public static void main(String[] args) {
		System.out.println(x);   // Error
	}
}

Example 2

public class A  {
	int x=10;
	public static void main(String[] args) {
		A a1 = new A();
		System.out.println(a1.x);
	}
}

Output : 10

Note 2 : Every time we create an object copy of a non-static member will get loaded into the object.

Example 1

public class A  {
	int x=100;
	public static void main(String[] args) {
		A a1 = new A();
		A a2 = new A();
		A a3 = new A();
		System.out.println(a1.x);
		System.out.println(a2.x);
		System.out.println(a3.x);
	}
}

Output :
100
100
100

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Note 3: Changing the value of the variable object will not change the original non-static variable as shown below example.

public class A  {
	int x=10;
	public static void main(String[] args) {
		A a1 = new A();
		a1.x =20;
		A a2 = new A();
		System.out.println(a1.x);
		System.out.println(a2.x);
	}
}

Output : 
20
10

Note 4: If not initialize non-static variable depend on variable automatically default value can be stored.

public class A  {
	int x;
	public static void main(String[] args) {
		A a1 = new A();
		System.out.println(a1.x);
	}
}

Output : 0