What is the syntax for using generic classes in java

1. Syntax

  类名<具体的数据类型> 对象名=new 类名<具体的数据类型>();

2.After Java 1.7, the after new does not need to be written. Generic classes do not support basic data types

Class name Object name=new Class name<>();

Instance

public class ManTest {
    public static void main(String[] args) {
        //在创建对象时就要给泛型标识指定具体的数据类型，这里我指定了String
        Gneeric gneeric=new Gneeric<>("adawddwadwa");
         String  key1 =  gneeric.getKey();
        System.out.println("Key1="+key1);//Key1=adawddwadwa
 
        Gneeric gneeric1=new Gneeric<>(123);
            int key2=gneeric1.getKey();
        System.out.println ("key2="+key2);//key2=123
        
        //泛型类在创建对象的时候是没有指定数据类型,将按照object类型操作
        Gneeric gneeric2=new Gneeric<>("awewaea");
        Gneeric gneeric3=new Gneeric<>(12121);
         Object key4 =gneeric3.getKey();
 
    }
}

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