newinstancedemo.java

来自「有关java学习技巧的课件」· Java 代码 · 共 28 行

import java.util.*;

public class NewInstanceDemo {
    public static void main(String[] args) { 
        try {
            Class c = Class.forName(args[0]);
            List list = (List) c.newInstance();
            
            for(int i = 0; i < 5; i++) {
                list.add("element " + i);
            }
            
            for(Object o: list.toArray()) {
                System.out.println(o);
            }
        }
        catch(ClassNotFoundException e) {
            System.out.println("找不到指定的类");
        } catch (InstantiationException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }
    }
}