/**
 * author Ding Chengyun
 * 2014-2-27
 */
package test;

import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;

/**
 * @author Ding Chengyun
 * 2014-2-27L
 */
public class ListTest {
	
	public void method1(List<Object> list) {
		
	}
	public void method2() {
		method1(new ArrayList<Object>());
		method1(new ArrayList<String>()); // 
		method1(new LinkedList<Object>());
	}

	public void method3(List<? extends Object> list) {
		
	}
	public void method4() {
		method3(new ArrayList<Object>());
		method3(new ArrayList<String>());
		method3(new LinkedList<Integer>());
	}
	
	public void method5(List<?> list) {// ? ? extends Object
		
	}
	public void method6() {
		method5(new ArrayList<Object>());
		method5(new ArrayList<String>());
		method5(new LinkedList<Integer>());
	}
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		List<String> list = new ArrayList<String>(20);
	}

}