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在java中如何动态的向数组中填加数据？？

摘要: 在java中如何动态的向数组中填加数据？？

List list1=db.find("from catenaalter where userno='"+user.getUserno()+"'");
for (int i =0;i {
Catenaalter pc=new Catenaalter();
//Date starttime=(Date)pc.getStartdate();
String str1=(pc.getStartdate()).toString();

StringTokenizer token=new StringTokenizer(str1,"-");
String year=token.nextToken();
String month=token.nextToken();
String day=token.nextToken();

String[] num1;
String[] num2;
String[] num3;
//下面我想在每一轮循环，分别将year, month, day 放入
String[] num1，String[] num2，String[] num3.

怎么做啊？？







}

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for(j=0;j num1[j]=year;
num2[j]=month;
num3[j]=day;
}

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List list1=db.find("from catenaalter where userno='"+user.getUserno()+"'");
for (int i =0;i{
Catenaalter pc=new Catenaalter();
//Date starttime=(Date)pc.getStartdate();
String str1=(pc.getStartdate()).toString();

StringTokenizer token=new StringTokenizer(str1,"-");
String year=token.nextToken();
String month=token.nextToken();
String day=token.nextToken();
String[] num1;
String[] num2;
String[] num3;

for(int j=0;j{
String[] num1=new String[];
String[] num2=new String[];
String[] num3=new String[];
num1[j]=year;
num2[j]=month;
num3[j]=day;


}


}


在这三行出错 String[] num1=new String[];
String[] num2=new String[];
String[] num3=new String[];
java 中怎么初始化数组啊？？

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这种初始化数组的方法报错，variable must provide either dimension expressions or an array initializer.

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数组必须先声名长度，而且长度不能改变，要实现动态添加应该声名的不是数组，而是集合对象，比如ArrayList等类的对象，具体用法参考JDK API，最好是1.5的。

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List list1=db.find("from catenaalter where userno='"+user.getUserno()+"'");

String[] num1=new String[list1.size()];
String[] num2=new String[list1.size()];
String[] num3=new String[list1.size()];

for (int i =0;i{
Catenaalter pc=new Catenaalter();
//Date starttime=(Date)pc.getStartdate();
String str1=(pc.getStartdate()).toString();

StringTokenizer token=new StringTokenizer(str1,"-");
num1[i]=token.nextToken();
num2[i]=token.nextToken();
num3[i]=token.nextToken();

}

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