Can generic methods throw exceptions in Java?

Generic methods in Java can throw exceptions, and the syntax is the same as that of ordinary methods. As shown in the compare method, if the object is empty or does not implement the Comparable interface, it will throw exceptions to handle different types of errors.

Generic methods throw exceptions in Java

In Java, generic methods can throw exceptions, like Same as normal method. This allows you to create generic methods that can throw different exceptions when different types of errors occur.

Syntax

The syntax of a generic method throwing an exception is the same as that of a normal method:

public <T> void myMethod(T arg) throws Exception {
    // ...
}

Practical case

Consider the following method for comparing two objects:

public static <T> int compare(T a, T b) {
    if (a == null || b == null) {
        throw new IllegalArgumentException("Arguments cannot be null");
    }
    if (!(a instanceof Comparable)) {
        throw new ClassCastException("Objects must implement Comparable");
    }
    return ((Comparable<T>) a).compareTo(b);
}

This method can be used to compare two objects of any type, as long as they implement the Comparable interface and cannot be null. If any condition is not met, the method will throw an exception:

try {
    int result = compare("hello", "world");
    System.out.println(result);
} catch (IllegalArgumentException | ClassCastException e) {
    System.err.println(e.getMessage());
}

Output:

-1

Conclusion

Generic methods can throw in Java Exceptions are thrown, allowing you to create generic methods that can handle different types of errors.

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