How to define Java generic classes

1. Description

(1) To define a generic class, you only need to add type parameters after the class name. Of course, you can also add multiple parameters, such as similar, etc. Therefore, we can use defined type parameters in categories.

(2) The most commonly used usage scenario of generic classes is the use of tuples. We know that the return value of the method can only return a single object. If we define a general type and define two or even three type parameters, then build such a tuple data in our general type and transfer multiple objects through generics, so that we can use multiple data at one time.

2. Example

class DataHolder<T>{
    T item;
    
    public void setData(T t) {
     this.item=t;
    }
    
    public T getData() {
     return this.item;
    }
}

What is Java

Java is an object-oriented programming language that can write desktop applications, Web applications, Distributed systems and embedded systems applications.

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