There are several things that can be done to prevent null pointer exceptions:
Always check for null values: Before performing any operation on a variable, it is necessary to check if it is null or not.
Use object-oriented programming principles: Applying object-oriented programming principles like encapsulation, inheritance, and polymorphism helps in reducing the risk of null pointer exceptions.
Initialize variables: Initialize variables with default values when declared, and if that's not possible, assign it a value as soon as possible in the code.
Use assertions: Assertions help to validate the assumptions of the code and validate that variables are not null.
Use try-catch blocks: Using try-catch blocks can help in handling null pointer exceptions.
Use Java 8 Optional: Java 8 introduced Optional, which is a container that may or may not contain a value. Using Optional ensures that the value is present before any operations are performed.
Use a framework: Popular frameworks like Spring and Guava provide libraries that help in reducing null pointer exceptions.
Asked: 2021-11-19 11:00:00 +0000
Seen: 22 times
Last updated: Apr 15 '21