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JAVA Programming
String str = null;
int length = str.length(); // This line will throw a NullPointerException
In this example, the str variable is assigned a null value, and the subsequent line tries to access the length() method on it. Since the variable is null, the program will throw a NullPointerException.
The purpose of the NullPointerException is to help developers identify and fix issues with null references in their code. By throwing this exception, the program is indicating that there is a problem that needs to be addressed.
int dividend = 5;
int divisor = 0;
try {
int result = dividend / divisor;
} catch (ArithmeticException e) {
System.out.println("Cannot divide by zero.");
}
In the above example, an ArithmeticException will be thrown because we are trying to divide dividend by zero. The catch block will then catch the exception and print the message “Cannot divide by zero.”
int[] arr = new int[3];
arr[3] = 4;
In this code, an ArrayIndexOutOfBoundsException will be thrown because the index 3 is outside the bounds of the arr array, which has a length of 3.
This exception can also be thrown by other methods that take an index as a parameter, such as String.charAt(int index) or List.get(int index), when an invalid index is provided.
In general, this exception is thrown when there is an attempt to access an array or collection with an index that is out of bounds. It is a common runtime exception that can be caught and handled like any other exception.
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