How to create a generic method with multiple type parameters in Java?

You can use generic methods to define and operate multiple types at the same time. The syntax is: void myMethod(T arg1, U arg2). It provides code reuse, type safety, readability, and supports different types of parameters, such as: void printDetails(T obj1, U obj2) can print detailed information of different types of objects.

#How to create a generic method with multiple type parameters in Java?

Generic methods in Java allow multiple types to be manipulated simultaneously using a single method definition. This provides code reuse, type safety, and enhanced readability and maintainability.

Syntax:

public <T, U> void myMethod(T arg1, U arg2) {
    // 方法体
}

In this syntax:

• ## Specify generics Type parameter list.
• arg1 and arg2 are parameters of different types of generic types.

Practical case:

Let us create a generic method to print the details of two different types of objects:

public class Main {
    public static <T, U> void printDetails(T obj1, U obj2) {
        System.out.println("对象 1 类型：" + obj1.getClass().getName());
        System.out.println("对象 2 类型：" + obj2.getClass().getName());
    }
    
    public static void main(String[] args) {
        // 调用具有两个不同类型参数的泛型方法
        printDetails("John Doe", 25);
    }
}

Output:

对象 1 类型：java.lang.String
对象 2 类型：java.lang.Integer

Type erasure:

It should be noted that Java uses type erasure. This means that the compiler removes generic type information at runtime. Therefore, generic type parameters are not available at runtime and type safety can only be checked at compile time.

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