java中遍历集合

2009-01-13 14:07:00

import java.util.ArrayList;

public class Demo
{
public static void main(String[] arge){
ArrayList<A> list = new ArrayList();
list.add(new A(1));
list.add(new A(2));
list.add(new A(3));
for(A a : list){
System.out.println(a.getId());
}
}
}

class A{
A(int i){
id = i;
}
private int id;

public int getId() {
return id;
}

public void setId(int id) {
this.id = id;
}
}

输出结果为：

1

2

3