gendemo.java

来自「java 的好东西,,开发的基本语言语法教程」· Java 代码 · 共 36 行

public class GenDemo {
	public static void main(String[] args) {
		//Create a Gen reference for Integer
		Gen<Integer> iOb;
		iOb=new Gen<Integer>(33);
		//show the type of data used by iOb
		iOb.showType();
		int v=iOb.getOb();
		System.out.println("value:"+ v);
		System.out.println();
		
		//create a Gen object for stirngs
		Gen<String> strOb=new Gen<String>("Generices Test");
		//show the type of data used by strOb
		strOb.showType();
		String str=strOb.getOb();
		System.out.println("value:"+str);
	}
}

class Gen<T>{
	T ob;
	//an object of type T
	Gen(T o){
		ob=o;
	}
	T getOb(){
		return ob;
	}
	//show type of T
	void showType(){
		System.out.println("type of T is "+ob.getClass().getName());
	}
}