How to determine if an object is null in Java?

In Java, you can use the following method to determine if an object is empty:

1. Check if the object is null using if statement.

if (object == null) {
    // 对象为空
} else {
    // 对象不为空
}

1. Use the Optional class introduced in Java 8 to check if an object is empty.

Optional<Object> optional = Optional.ofNullable(object);
if (optional.isPresent()) {
    // 对象不为空
} else {
    // 对象为空
}

1. Use methods from the Apache Commons library to determine if an object is empty.

if (ObjectUtils.isEmpty(object)) {
    // 对象为空
} else {
    // 对象不为空
}

1. Use the methods in the Guava library to check if an object is empty.

if (Strings.isNullOrEmpty(object)) {
    // 对象为空
} else {
    // 对象不为空
}

Please choose the appropriate method according to your actual needs to determine if the object is empty.