if contains two words

I am brand new at coding and can not get my application to run right. Please help!

I have written the following code for a HW assignment:

import java.util.Scanner;

public class HW1Q2
{
    public static void main(String[] args)
    {
        Scanner keyboard = new Scanner(System.in);
        String sentence, str1, str2;

        System.out.println("Enter a sentence containing either the word \"blue\" or the word \"green\" both or neither");
        sentence = keyboard.nextLine();
        str1 = "blue";
        str2 = "green";

        if(sentence.contains("blue")); if(sentence.contains("green")){
            System.out.println("sunny");}
        else{
        if(sentence.contains("blue")){
            System.out.println("ocean");}
        else{
        if(sentence.contains("green")){
            System.out.println("garden");}
        else{
            System.out.println("dull");
        }}}
    }
}

The goal is to return

• garden if they type green
• ocean if they type blue
• sunny if they type both and
• dull if they type neither

The problem is if I write a sentence that only includes green, it still returns sunny not garden.