Generic泛型的小程序

Gen.java

package com.zyl;

public class Gen<T> {
	private T ob; // 定义泛型成员变量 　　

	public Gen(T ob) {
		this.ob = ob;
	}

	public T getOb() {
		return ob;
	}

	/*public void setOb(T ob) {
		this.ob = ob;
	}*/

	public void showType() {
		System.out.println("T的实际类型是: " + ob.getClass().getName());
	}
}

Gen2.java

package com.zyl;

public class Gen2 {

	private Object ob;

	public Gen2(Object ob) {
		this.ob = ob;
	}

	public Object getOb() {
		return ob;
	}

	public void setOb(Object Ob) {
		this.ob = ob;
	}

	public void showType() {
		System.out.println("T的实际类型是:" + ob.getClass().getName());

	}

}

GenDemon.java

package com.zyl;

public class GenDemo {
	public static void main(String[] args) {
		// TODO Auto-generated method stub

	
	Gen<Integer> intOb=new Gen<Integer>(88);
    intOb.showType();
    int i = intOb.getOb();
    System.out.println("Value="+i);
  
    Gen<String> strOb=new Gen<String>("HelloWorld!");
    strOb.showType();
    String s = strOb.getOb();
    System.out.println("Value="+s);
	}
}

GenDemo2.java

package com.zyl;

import org.omg.CORBA.PUBLIC_MEMBER;

public class GenDemo2 {
	public static void main(String[] args) {
		Gen2 intOb = new Gen2(new Integer(88));
		intOb.showType();
		int i = (Integer) intOb.getOb();
		System.out.println("value= " + i); 
		System.out.println("---------------------------------");
		Gen2 strOb = new Gen2("Hello Gen!");
		strOb.showType();
		String s = (String) strOb.getOb();
		System.out.println("value= " + s);

	}
}