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