Nested Try Example in Java

Introduction

Nested Try is a classic Java console program that demonstrates the concept with complete source code and sample output. Exceptions represent runtime errors; Java uses try-catch-finally to handle them safely.

This tutorial walks through the program line by line, explains how the logic works, and highlights best practices you can apply in your own code.

Definition

The statements within the try block are executed, and if any of them throws an exception, execution of the block is discontinued and the exception is handled by the catch block.

Syntax

...
try  {  
    //Do something
    try {  
        //Do something
    }  
    catch(Exception e){  
    }  
}  
catch(Exception e){  
}  
...

Nested Try Example Program

public class NestedTryDemo {
    public static void main(String[] args) {
        try {
            checkException();
        } catch (ArithmeticException e) {
            System.out.println("ArithmeticException");
        } finally {
            System.out.println("Finally outside method");
        }
    }
    public static void checkException() {
        try {
            int res = 3 / 0;
        } finally {
            System.out.println("Finally inside method");
        }
    }
}

Sample Output

Finally inside method
ArithmeticException
Finally outside method

When to use

Use this nested try example when learning or revising core Java syntax.

How it works

1. Execution begins in the main method — the JVM calls this method when you run the class.

2. A println / print call writes text to the console — part of the sample output below.

3. A println / print call writes text to the console — part of the sample output below.

4. int res = 3 / 0; updates a variable used in the calculation or output.

5. A println / print call writes text to the console — part of the sample output below.

6. Compare your console output with the sample output for Nested Try to confirm the program behaves correctly.

Best Practices

• Use meaningful variable and class names that describe their purpose.
• Compile and run the program locally — modify values to see how output changes.
• Read compiler errors carefully; they usually point to the exact line to fix.

Common Mistakes

• Copying code without understanding each line — practice by changing one statement at a time.
• Mismatching the public class name and the .java filename.
• Forgetting semicolons at the end of statements.