Try–catch block in Java - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to catch an exception.

Java

try {
    int result = 10 / 0;
} catch ([1] e) {
    System.out.println("Error occurred");
}

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Aint

BException

CString

Dvoid

Attempts:

3 left

💡 Hint

Common Mistakes

Using a data type like int or String instead of an exception type.

Leaving the catch parentheses empty.

The catch block must specify an exception type to catch errors. Exception is the general type for exceptions.

2fill in blank

medium

Complete the code to print the exception message.

Java

try {
    int[] arr = new int[2];
    System.out.println(arr[5]);
} catch (ArrayIndexOutOfBoundsException e) {
    System.out.println(e.[1]());
}

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AtoString

BprintStackTrace

CgetMessage

Dlength

Attempts:

3 left

💡 Hint

Common Mistakes

Using printStackTrace() which prints the whole trace instead of just the message.

Using length which is not a method of exceptions.

The getMessage() method returns the error message of the exception.

3fill in blank

hard

Fix the error in the catch block declaration.

Java

try {
    int a = Integer.parseInt("abc");
} catch ([1] e) {
    System.out.println("Invalid number format");
}

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ANumberFormatException

BNullPointerException

CIOException

DArithmeticException

Attempts:

3 left

💡 Hint

Common Mistakes

Using unrelated exceptions like IOException or ArithmeticException.

Not catching the specific exception thrown.

The parseInt method throws NumberFormatException when the string is not a valid number.

4fill in blank

hard

Fill both blanks to catch an exception and print its message.

Java

try {
    String s = null;
    System.out.println(s.length());
} catch ([1] e) {
    System.out.println(e.[2]());
}

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ANullPointerException

BgetMessage

CprintStackTrace

DIOException

Attempts:

3 left

💡 Hint

Common Mistakes

Using IOException which is unrelated.

Using printStackTrace instead of getMessage.

The code throws a NullPointerException when calling length() on null. The getMessage() method prints the error message.

5fill in blank

hard

Fill all three blanks to catch an exception, print its message, and execute code after try-catch.

Java

try {
    int[] nums = {1, 2, 3};
    System.out.println(nums[[1]]);
} catch ([2] e) {
    System.out.println(e.[3]());
}
System.out.println("Program continues");

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A5

BArrayIndexOutOfBoundsException

CgetMessage

DNullPointerException

Attempts:

3 left

💡 Hint

Common Mistakes

Using a valid index like 2 which does not cause an exception.

Using NullPointerException which is unrelated here.

Using printStackTrace instead of getMessage.

Accessing index 5 in an array of size 3 causes ArrayIndexOutOfBoundsException. The getMessage() method prints the error message. The program then continues after the catch block.