82 lines
1.8 KiB
Markdown
82 lines
1.8 KiB
Markdown
# Advanced Programing - 8 Report
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## Theoretical Questions Answers
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---
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## 1. start() vs run()
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### Output:
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-Calling run()
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-Running in: main
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-Calling start()
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-Running in: Thread-2
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### Explanation
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When calling "t1.run()" directly, the run method executes in the current thread (main).
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When calling "t2.start()" , java creates a new thread and executes run() in that thread (Thread-2).
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### Difference:
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|start()|run()|
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|-------|-----|
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|Creates new thread|No new thread|
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|Executes run() in new thread|Executed like nurmal method|
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|Can only be called once|Can be called multiple times|
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---
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## Deamon Threads
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### Output(with demon):
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-Main thread ends
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-Deamon thread running...
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-(Program terminates quickly)
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### Output(without demon):
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-Main thread ends.
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-Deamon thread running...
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-(20 times)
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### Explanation
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-A daemon thread is a background thread that does NOT prevent the JVM from exiting.
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When the main thread (non-daemon) finishes,
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the JVM checks if there are any non-daemon threads still running.
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Since only the daemon thread remains,
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the JVM terminates immediately without waiting for the daemon thread to complete its 20 iterations.
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-Without setDaemon(true), the thread becomes a user thread (non-daemon) .
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User threads prevent the JVM from exiting until they complete.
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Therefore, the JVM waits for the thread to finish all 20 iterations before terminating the program.
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---
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### Real-life use cases:
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1. Garbage Collector (GC)
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2. Auto-save features
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3. Background logging
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4. Session cleanup in web servers
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---
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## 3. Lambda Expressions
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### Output:
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-Thread is running using a...!
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### What is `() -> {}`?
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This is a **Lambda Expression** introduced in Java.
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### Comparison:
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| Traditional | Lambda |
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|-------------|--------|
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| Needs separate class | No separate class |
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| More code | Concise |
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| `new Thread(new Runnable(){...})` | `new Thread(() -> {...})` |
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--- |