How to use Else If statements in Netbeans?

For my netbeans project i have been tasked to create a zoo data base for animals. I was wondoring how can the user select a desired option for different effect such as by inputting number "1" and press enter will show mammals information for gender, species & such and inputting number "2" and press enter will show Reptiles information as shown below. Any answers is appreciated

System.out.println("Welcome to our zoo data base. Please select a number for the corresponding type of animals");

System.out.println("1. Mammal");

System.out.println("2. Reptiles");

System.out.println("3. Birds");