java中的泛型编程

public class MyGenericClass<T> {
    private T data;

    public void setData(T data) {
        this.data = data;
    }

    public T getData() {
        return data;
    }
}

MyGenericClass<String> stringClass = new MyGenericClass<>();
stringClass.setData("Hello, world!");
System.out.println(stringClass.getData());

public class MyGenericMethod {
    public <T> void printData(T data) {
        System.out.println(data);
    }
}

MyGenericMethod method = new MyGenericMethod();
method.printData("Hello, world!");