Java generics for method parameter with any class object

Question

I have a Java method which has to accept generic object.

Public void myMethod(Object<T> anyClassObject) {
    //handle code
}

The method should accept object of any class and I have to manage the content of the object. I am not an expert in Generics. So please help me to achieve this using Generics.

my need is to create a method which any class's instance. And then I have to save the object in database.

For saving into database, have to specify the persistent entity class as usual.

For example,

mongoTemplate.createCollection(One.class)

For an other entity,

mongoTemplate.createCollection(Two.class)

like the above.

I have to write a method which can be accessed in common

Do you need to use generics here? (Sometimes you don't, and Object is good enough) — Stack Exchange Broke The Law
– Stack Exchange Broke The Law, Commented Feb 9, 2015 at 5:05

Stack Exchange Broke The Law · Accepted Answer · 2015-02-09 05:13:00Z

5

To accept a reference to any object, you don't even need generics. Simply use Object as the type:

public void myMethod(Object someObject) {
    // code ...
}

Generics become necessary only when you want to have multiple things with related types. For example, here's a method that takes a reference of any type, and returns the same reference with the same type:

public <T> T doNothing(T someObject) {
    return someObject;
}

doNothing("").length() will compile - if doNothing is passed a String, then it returns a String.

answered Feb 9, 2015 at 5:13

Stack Exchange Broke The Law

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