泛型

• JAVA 的参数化类型 称为 泛型

泛型类的设计

Learn12.java

public class Learn12<T>{
    private T flag;

    public Learn12(T flag){
        this.flag = flag;
    }

    public T getDisc(){
        return flag;
    }


    public static void main(String[]  args){
        Learn12<String>  strClass = new Learn12<String>("=String=");
        System.out.println( strClass.getDisc() );

        Learn12<Integer> intClass = new Learn12<Integer>(100);
        System.out.println(intClass.getDisc());
        
    }


}

运行

=String=
100