What is static variable in java with best example

static variable: – Static variable has global access which means it can be accessed anywhere in the program as shown in the below program.

static variable important points in java

• a static variable created outside method but inside class using the static keyword.
• static variable belongs to the class that is called a class variable also.
• do not create an object to access the static variables.
• the static variable value can be changed.

Static Variable in Java Program

Example 1

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

Output: 10

Note – the static variable value can be changed, as shown below example.

public class A{  
	static int x=10;
	public static void main(String[] args) {
		System.out.println(A.x);
		A.x =20;
		System.out.println(A.x);
		A.x =5;
		System.out.println(x);
	}
	
}

Output:
10
20
5

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• What is Lambda Expression in Java 8
• What is Exception Handling in Java
• Types of Exceptions in Java
• What is inheritance in Java
• What is the Final Keyword in Java
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• What is Wrapper Class in Java
• Break Keywords in Java with Example
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• What is Polymorphism in java
• What is a non-static variable in java
• Types of access specifiers in java
• What is the local variable in java
• Types of loops in java with program
• Remove duplicate elements in an Array in java
• What is var type in java

Example 2

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

Output: 
10
10

Note 1 – It is not mandatory to initialize static variables if we do not initialize then depending on datatype automatically default value can store it.

Example 3

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

Output: 0

data types and their default values in java

Note 2 – There are three ways to access static variables.

First – ClassName.VariableName

public class A{  
	static int x=100;
	public static void main(String[] args) {
 		System.out.println(A.x);
		// ClassName.VariableName
	}
	
}

Second – VariableName

public class A{  
	static int x=100;
	public static void main(String[] args) {
 		System.out.println(x);
		//VariableName
	}
	
}

Third – ReferenceVariable.StaticVariable ( Wrong )

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