Interview 01

Interview time: 2019-05-22
Interview location: a development studio in Optics Valley Plaza, Wuhan
Interview position: Java development
written test questions:

1. What are the main versions of Java language development?
2. Lazy man mode + hungry man mode in singleton mode.
3. Inheritance issues in Java.
4. The modifier issue of the Java interface.
5. The difference between Integer and int.
6. Math.round(11.5); and Math.round(-11.5); the result.
7. Execute String s=“123”;s=s+“123”; Whether the content of the String object changes after the statement is important to understand).
8. The problem of string processing is mainly to delete special characters in a string except English letters.