Explain the significance of the default label in the 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 println statement 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;
}

Output

Value of number is greater than two