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Архів дописів
𝗤. 𝗪𝗵𝗮𝘁 𝗶𝘀 𝗽𝗼𝗹𝘆𝗺𝗼𝗿𝗽𝗵𝗶𝘀𝗺 ?
Polymorphism in Java refers to the feature of deciding which overridden method will be used at the run time of a program. It allows objects of different classes to be treated as objects of a common superclass, enabling flexibility and code reusability. This feature is achieved through method overriding, where a subclass provides its own implementation of a method that is already defined in its superclass. At runtime, the JVM determines which version of the method to execute based on the actual type of the object being referred to.
𝗤. 𝗪𝗵𝗮𝘁 𝗶𝘀 𝗶𝗻𝘁𝗲𝗿𝗳𝗮𝗰𝗲 𝗶𝗻 𝗷𝗮𝘃𝗮?
An interface is a collection of abstract methods and constants. It is a way to define a contract for classes that implement it, specifying the methods that must be implemented and the constants that must be defined. By using interfaces, we can achieve abstraction and provide a common set of methods and constants that can be used by multiple classes. Classes implementing an interface must provide the implementation for all the abstract methods defined in the interface.
Q Which organization is responsible for managing IP address allocation?
public static void main(String[] args) {
System.out.println(10 + 20 + "30" + 40 + 50);
}
Output ⬇️
𝗤. 𝗪𝗵𝗮𝘁 𝗶𝘀 𝗗𝗲𝗯𝘂𝗴𝗴𝗶𝗻𝗴 𝗶𝗻 𝗝𝗮𝘃𝗮?
==============================
Debugging in Java involves identifying and fixing bugs in the code.
⏺ 𝗟𝗼𝗴𝗴𝗶𝗻𝗴: Use System.out.println() or logging frameworks like Log4j.
⏺ 𝗗𝗲𝗯𝘂𝗴𝗴𝗶𝗻𝗴 𝗧𝗼𝗼𝗹𝘀 𝗶𝗻 𝗜𝗗𝗘𝘀: Utilize features in IntelliJ IDEA, Eclipse, NetBeans.
• 𝐁𝐫𝐞𝐚𝐤𝐩𝐨𝐢𝐧𝐭𝐬: Pause code execution at specific points.
• 𝐒𝐭𝐞𝐩 𝐈𝐧, 𝐒𝐭𝐞𝐩 𝐎𝐯𝐞𝐫, 𝐒𝐭𝐞𝐩 𝐎𝐮𝐭: Navigate code execution line-by-line.
• 𝐕𝐚𝐫𝐢𝐚𝐛𝐥𝐞 𝐈𝐧𝐬𝐩𝐞𝐜𝐭𝐢𝐨𝐧: Check current values of variables during execution.
⏺ 𝗨𝗻𝗶𝘁 𝗧𝗲𝘀𝘁𝗶𝗻𝗴: Use JUnit to test individual code units to ensure correctness.
⏺ 𝗘𝘅𝗰𝗲𝗽𝘁𝗶𝗼𝗻 𝗛𝗮𝗻𝗱𝗹𝗶𝗻𝗴: Use try-catch blocks to catch and manage errors.
⏺ 𝗖𝗼𝗱𝗲 𝗥𝗲𝘃𝗶𝗲𝘄𝘀: Have peers review your code to find unnoticed bugs.
⏺ 𝗩𝗲𝗿𝘀𝗶𝗼𝗻 𝗖𝗼𝗻𝘁𝗿𝗼𝗹: Use Git to track and compare code changes over time.
Practice and experience enhance debugging skills.
