반응형 자바(Java)/자바 AP26 [자바AP연습문제] 09.Inheritance [자바AP연습문제] 09.Inheritance *09.Inheritance 단원의 복습내용은 아래 "더보기" 클릭 더보기 In this chapter you learned about inheritance. In an object-oriented program you write classes that define what objects of each class know (instance variables) and can do (methods). One class can inherit object instance variables and methods from another, which makes the amount of code that you have to write smaller and makes th.. 2024. 3. 29. [자바AP연습문제]08.2D Arrays [자바AP연습문제] 08. 2D Arrays *08.2D Arryas 단원의 복습내용은 아래 "더보기" 클릭 더보기 In this chapter you learned about two dimensional arrays. A two dimensional array stores objects in a 2d table. You can think of it as storing objects in rows and columns, but it actually uses an array of arrays to store the objects as shown below. In this chapter you learned how to declare 2d arrays, create them, and access array .. 2024. 3. 29. [자바AP연습문제] 07.ArrayList [자바AP연습문제] 07.ArrayList *07.ArrayList 단원의 복습내용은 아래 "더보기" 클릭 더보기 In this chapter you learned about ArrayLists which are dynamic re-sizable arrays. You learned how to declare and create ArrayLists, add and remove objects from them, set the object at an index, and get the object at an index. List are like arrays in that you can store many objects of the same type in a list, just as you can in an ar.. 2024. 3. 29. AP Computer Science A Java Quick Reference (3) Math Class AP Computer Science A Java Quick Reference (3) Math Class 자바에서 Math 클래스는 자바를 설치하면 포함되는 클래스로서, 이 클래스 안에 있는 메소드들은 static method이기 때문에 object를 만들지 않고 "클래스이름.메소드이름()" 방식으로 바로 사용가능합니다. Static methods (also called class methods) are called using the class name and the dot operator (.) followed by the method name. You do not need to create an object of the class to use them. You can use ClassName.metho.. 2024. 3. 28. AP Computer Science A Java Quick Reference (2) Integer & Double AP Computer Science A Java Quick Reference (2) Integer & Double 1.Wrapper Class - Integer & Double HTML 삽입 미리보기할 수 없는 소스 wrapper class for int is Integer. wrapper class for double is Double. int, double의 primitive type 대신에 Integer, Double 같은 wrapper 클래스를 만들면 다양한 method를 사용할 수 있는 장점이 있습니다. Java 9 버전이후로는 그냥 = 연산을 사용하여 값을 바로 대입해 Integer, Double 오브젝트를 만들어도 됩니다. 생성자(Constructor)를 사용하여 Integer, Double.. 2024. 3. 28. APCSA(JAVA) Midterm Test(Unit.01~05) APCSA(JAVA) Midterm Test(Unit.01~05) -Test link : Click this link 5.15. Midterm Test — AP CSAwesome 5.15. Midterm Test The following 20 questions are similar to what you might see on the AP CSA exam for Units 1 - 5. You may only take this test once while logged in. There are no time limits, but it will keep track of how much time you take. Click on the f runestone.academy [문제1] Which of the foll.. 2024. 3. 27. AP Computer Science A Java Quick Reference AP Computer Science A Java Quick Reference (1) String Class APCSA 시험에서 자주 등장하는 Java method의 이론과 사용 방법에 대한 내용입니다. (1) String Class 자바에는 기본적으로 String 클래스가 존재합니다. String은 문자열을 의미하고, 문자열이란 문자(character)가 서로 연결된 형태("Hello")를 말합니다. String 클래스로 만든 object들은 String 클래스의 field와 method(위 표 참고)를 모두 사용할 수 있습니다. [예제1-1] 아래 코드의 실행 결과를 확인해 보세요. HTML 삽입 미리보기할 수 없는 소스 위 코드에서, greeting1, greeting2와 같이 "string lite.. 2024. 3. 25. [자바AP연습문제]06.Arrays [자바AP연습문제]06.Arrays *06.Arrays에 대한 복습은 아래 "더보기" 클릭 더보기 An array is consecutive storage for multiple items of the same type like the top five scores in a game. You learned how to declare arrays, create them, and access array elements. Array elements are accessed using an index. The first element in an array is at index 0. Array - An array can hold many items (elements) of the same type. You can a.. 2024. 3. 24. [자바AP연습문제]05.Writing Classes [자바AP연습문제]05.Writing Classes 문제 정답은 제일 아래 "더보기" 클릭 *05.Writing Classes 단원의 복습 내용은 아래 "더보기" 클릭 더보기 Class - A class defines a type and is used to define what all objects of that class know and can do. Compiler - Software that translates the Java source code (ends in .java) into the Java class file (ends in .class). Compile time error - An error that is found during the compilation. These are also .. 2024. 3. 24. 이전 1 2 3 다음 728x90 반응형
