Pre Test - Pemrograman Berorientasi Obyek (Java)

Exception handling adalah fitur di Java yang memungkinkan programmer untuk mengatur penanganan error yang terjadi dalam program. Dengan menggunakan exception handling, programmer dapat menangani dan mengelola error dengan cara yang terstruktur dan terkontrol, sehingga program dapat tetap berjalan dengan baik meskipun terjadi error.

Operator aritmatika yang akan menghasilkan sisa hasil bagi dari 2 operand adalah %. Operator ini disebut juga sebagai operator modulus. Ketika operand pertama dibagi dengan operand kedua, operator modulus akan mengembalikan sisa hasil bagi dari pembagian tersebut.

Perl is not a compiled programming language. It is an interpreted language, which means that the code is executed line by line without the need for compilation. In contrast, Java, C, and Pascal are all compiled programming languages, where the source code is compiled into machine code before execution.

Inheritance is a concept in object-oriented programming that allows a class to inherit or acquire properties and behaviors from another class. It enables code reusability and promotes the concept of hierarchy in programming. With inheritance, a class can inherit attributes and methods from a parent class, known as the superclass or base class. This allows the subclass or derived class to extend or modify the functionality of the superclass while inheriting its common characteristics. Inheritance facilitates code organization, improves code readability, and reduces code duplication.

J2ME is the most appropriate option for developing a Java application for mobile devices. J2ME (Java 2 Micro Edition) is a platform that provides a runtime environment for running Java applications on small devices with limited resources, such as mobile phones. It offers a set of APIs and libraries specifically designed for mobile development, allowing developers to create applications that are optimized for mobile devices. Therefore, J2ME is the best choice for developing a Java application that can be run on mobile devices.

The correct answer is "// dan /* ... */" because in Java, comments can be written using double slashes (//) for single-line comments and using /* ... */ for multi-line comments. The other options mentioned (/* ... */ saja, #, and // saja) are not valid ways to write comments in Java.

Method overloading adalah ketika terdapat beberapa method dengan nama yang sama tetapi memiliki parameter yang berbeda. Hal ini memungkinkan penggunaan yang lebih fleksibel dan memudahkan pemanggilan method dengan parameter yang sesuai dengan kebutuhan. Dengan adanya method overloading, kita dapat memiliki beberapa implementasi dari sebuah method dengan nama yang sama tetapi dengan fungsionalitas yang berbeda tergantung pada parameter yang diberikan.

A constructor is a special method that is automatically executed when an object of a class is created. It is used to initialize the object's state and perform any necessary setup tasks. In this case, the question is asking for the term that refers to the method that is automatically executed when an object of a class is created. The correct answer is "Constructor".

The statement "Method main() harus ada dalam setiap class program Java" is incorrect because the main() method is not required in every class in a Java program. The main() method is only required in the class that serves as the entry point for the program, typically named the "main" class. Other classes in the program may or may not have a main() method depending on their purpose.

In Java, data type checking is performed during program compilation. This means that the compiler checks if the data types used in the program are compatible and consistent with the operations and assignments performed. Any errors or inconsistencies in the data types will be detected and reported during the compilation process. This ensures that the program is syntactically correct and helps prevent type-related errors during runtime.

To run a Java program, the computer must have JRE (Java Runtime Environment) installed. JRE provides the necessary runtime environment for executing Java applications. It includes the Java Virtual Machine (JVM), libraries, and other components required to run Java programs. JRE does not include the Java development tools or compiler, but it is sufficient for running already compiled Java programs. Therefore, JRE is the correct answer as it is essential for executing Java programs.

The given options represent different data types in Java. "long", "int", and "float" are all valid data types in Java. However, "string" is not a valid data type in Java. The correct data type for representing textual data in Java is "String" (with a capital "S"). Therefore, the correct answer is "string" because it is not a valid data type in Java.

The most appropriate data type to store student ID data is a string. Student ID numbers typically consist of a combination of numbers and letters, and can vary in length. Using a string data type allows for flexibility in storing and manipulating these values. Numeric data types such as int or float would not be suitable as they only allow for numerical values, while a string data type can accommodate alphanumeric characters.

The given variable names "nim_mahasiswa", "$nilai", "NAMA", and "nilai-mhs" are all valid variable names in Java. However, "nilai-mhs" is not a valid variable name because it contains a hyphen, which is not allowed in variable names in Java.

JavaBeans is not an editor that can be used to write Java programs. It is a software component model for Java that allows for the creation of reusable software components. Notepad, Eclipse, and JCreator are all editors that can be used to write Java programs.

The keyword "super" is used to access the parent class in Java. It is used to call the constructor, methods, and variables of the parent class from the child class. This allows the child class to inherit and utilize the functionality of the parent class.

Java memiliki mekanisme pengelolaan memori yang disebut Garbage Collector. Garbage Collector bertugas untuk secara otomatis menghapus pengalokasian memori yang sudah tidak digunakan oleh program. Hal ini dilakukan untuk mengoptimalkan penggunaan memori dan mencegah terjadinya kebocoran memori. Dengan adanya Garbage Collector, programmer tidak perlu secara manual menghapus objek yang sudah tidak digunakan, sehingga memudahkan dalam pengembangan program.

The given options are if, break, goto, and string. All of these options are keywords in Java except for the keyword "string". In Java, "string" is not a keyword, but it is a class that represents a sequence of characters. Keywords in Java have predefined meanings and cannot be used as identifiers, while "string" can be used as an identifier for variables, methods, or classes.

The correct answer is "Object terdiri dari keyword dan method." This statement is incorrect because an object is an instance of a class and it consists of data (state) and behavior (methods), not just keywords and methods.