Java · Theory

Finally Block in Java

Theory

93/270

Finally Block in Java

finally runs after try (and catch, if any). Use it for cleanup: close file, close connection. It runs whether an error happened or not — that is the point.

try-with-resources often replaces manual finally for Closeable things, but viva still asks finally. A return inside try still hits finally before leaving.

Don’t put the real business result only in finally. finally is cleanup, not the main logic.

Let's take this on the board with one tiny Main class — no extra files. Finally Block in Java — output: Cannot divide then finally always. catch handles /0; finally still runs. Start from main, go line by line, and stop at each print. That output is the proof for Finally Block.

Exam tip

Say: finally always runs for cleanup. Then mention try-with-resources as the modern close.

Example

public class Main {
  public static void main(String[] args) {
    try {
      System.out.println("try");
    } finally {
      System.out.println("finally always");
    }
  }
}

Finally Block in Java — output: Cannot divide then finally always. catch handles /0; finally still runs.

Short notes

Deffinally = cleanup after try. Runs whether error happened or not.
UseClose file / connection.
Rememberreturn in try still runs finally first.
TrapUsing finally for main logic instead of cleanup.

Java · Theory

Finally Block in Java

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Theory

93/270

Finally Block in Java

finally runs after try (and catch, if any). Use it for cleanup: close file, close connection. It runs whether an error happened or not — that is the point.

try-with-resources often replaces manual finally for Closeable things, but viva still asks finally. A return inside try still hits finally before leaving.

Don’t put the real business result only in finally. finally is cleanup, not the main logic.

Exam tip

Say: finally always runs for cleanup. Then mention try-with-resources as the modern close.

Example

public class Main {
  public static void main(String[] args) {
    try {
      System.out.println("try");
    } finally {
      System.out.println("finally always");
    }
  }
}

Finally Block in Java — output: Cannot divide then finally always. catch handles /0; finally still runs.

Short notes

Deffinally = cleanup after try. Runs whether error happened or not.
UseClose file / connection.
Rememberreturn in try still runs finally first.
TrapUsing finally for main logic instead of cleanup.

Finally Block in Java

Example

Short notes

Questions

Finally Block in Java

Example

Short notes

Questions