Java编程思想-泛型-简单泛型例子

基本类型无法做为类型参数

代码如下：

/**

 * 

 */

package test.thinkinjava.Generics;



import java.util.ArrayList;

import java.util.List;



/**

 * @author Luo

 * 

 */

public class Abc<T> {



    private List<T> list = new ArrayList<T>();



    private T element;



    @Override

    public String toString() {

        return list.toString();

    }



    public void addList(T element) {

        this.list.add(element);

    }



    public T getElement() {

        return element;

    }



    public void setElement(T element) {

        this.element = element;

    }



    public static void main(String[] args) {

        Abc<String> abcString = new Abc<String>();

        abcString.addList("a");

        abcString.addList("b");

        abcString.addList("c");

        abcString.addList("d");

        abcString.addList("e");

        System.out.println(abcString.toString());

        abcString.setElement("okda");

        System.out.println(abcString.getElement() instanceof String);

        Abc<Integer> abcInteger = new Abc<Integer>();

        abcInteger.addList(1);

        abcInteger.addList(2);

        abcInteger.addList(3);

        abcInteger.addList(4);

        abcInteger.addList(5);

        System.out.println(abcInteger.toString());

        abcInteger.setElement(1234567899);

        System.out.println(abcInteger.getElement() instanceof Integer);

    }

}

上面的T也可以换成其他英文字母

 

输出结果是