java 验证增加数据

package test;

import java.util.List;
import java.util.ArrayList;
import java.util.Collection;

public class ImplementsDemo {
public static void main(String[] args) {
List<String> allList=null;
Collection<String> allCollection=null;
allList=new ArrayList<String>();
allCollection=new ArrayList<String>();
allList.add("Hello!");//在开头增加
allList.add(0,"World");
System.out.println(allList);
allCollection.add("hjw");
allCollection.add("www..ss.cc.");
allList.addAll(allCollection);
System.out.println(allList);
allList.addAll(
0,allCollection);//0，表示在末尾增加
System.out.print(allList);

}

}