练习题

请描述下面的输出结果
public class Test {
    public static void main(String[] args) {
        String str1 = "HelloFlyapi";
        String str2 = "HelloFlyapi";
        String str3 = new String("HelloFlyapi");
        String str4 = "Hello";
        String str5 = "Flyapi";
        String str6 = "Hello" + "Flyapi";
        String str7 = str4 + str5;

        System.out.println("str1 == str2 result: " + (str1 == str2));

        System.out.println("str1 == str3 result: " + (str1 == str3));

        System.out.println("str1 == str6 result: " + (str1 == str6));

        System.out.println("str1 == str7 result: " + (str1 == str7));

        System.out.println("str1 == str7.intern() result: " + (str1 == str7.intern()));

        System.out.println("str3 == str3.intern() result: " + (str3 == str3.intern()));
    }
}