Java · Theory

How to Create Thread in Java?

Theory

109/270

How to Create Thread in Java?

Two common ways. 1) Extend Thread and override run(), then t.start(). 2) Implement Runnable and pass it to new Thread(r).start(). Prefer Runnable — your class can still extend something else.

Work goes in run(). start() asks the JVM to schedule a new thread. If you call run() yourself, it runs on the same thread — no parallelism.

lambda — new Thread(() -> System.out.println("hi")).start();

Let's take this on the board with one tiny Main class — no extra files. How to Create Thread in Java? — start() schedules the thread; main also prints — order may vary. Start from main, go line by line, and stop at each print. That output is the proof for How to Create Thread ?.

Exam tip

Two ways: extend Thread or implement Runnable. Always start(), never run() for a new thread.

Example

// Thread demo
public class Main {
  public static void main(String[] args) {
    Thread t = new Thread(() -> System.out.println("Hi from thread"));
    t.start();
    System.out.println("Hi from main");
  }
}

How to Create Thread in Java? — start() schedules the thread; main also prints — order may vary.

Short notes

DefCreate with extends Thread or implements Runnable, then start().
RulePrefer Runnable. Work in run(). Start with start().
TrapCalling run() instead of start().
Usenew Thread(() -> ...).start();

Java · Theory

How to Create Thread in Java?

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Theory

109/270

How to Create Thread in Java?

Two common ways. 1) Extend Thread and override run(), then t.start(). 2) Implement Runnable and pass it to new Thread(r).start(). Prefer Runnable — your class can still extend something else.

Work goes in run(). start() asks the JVM to schedule a new thread. If you call run() yourself, it runs on the same thread — no parallelism.

lambda — new Thread(() -> System.out.println("hi")).start();

Exam tip

Two ways: extend Thread or implement Runnable. Always start(), never run() for a new thread.

Example

// Thread demo
public class Main {
  public static void main(String[] args) {
    Thread t = new Thread(() -> System.out.println("Hi from thread"));
    t.start();
    System.out.println("Hi from main");
  }
}

How to Create Thread in Java? — start() schedules the thread; main also prints — order may vary.

Short notes

DefCreate with extends Thread or implements Runnable, then start().
RulePrefer Runnable. Work in run(). Start with start().
TrapCalling run() instead of start().
Usenew Thread(() -> ...).start();

How to Create Thread in Java?

Example

Short notes

Questions

How to Create Thread in Java?

Example

Short notes

Questions