Explain with the help of an example, the purpose of default in a switch statement.

When none of the case values are equal to the expression of switch statement then default case is executed. In the example below, value of number is 4 so case 0, case 1 and case 2 are not equal to number. Hence sopln of default case will get executed printing "Value of number is greater than two" to the console.

int number = 4;
    
switch(number) {
    
    case 0:
        System.out.println("Value of number is zero");
        break;
        
    case 1:
        System.out.println("Value of number is one");
        break;
        
    case 2:
        System.out.println("Value of number is two");
        break;
        
    default:
        System.out.println("Value of number is greater than two");
        break;
        
}