set 集合

set




package text_2019;

import java.awt.geom.GeneralPath;
import java.util.ArrayList;
import java.util.Collection;

public class Ttt {

public static  void main(String[] args) {
	// TODO Auto-generated method stub
	
             Collection coll =  new  ArrayList(); 
             coll.add("1");
             coll.add("2");
             coll.add("3");
             
             for(Object at: coll){
            	 System.out.println(at);
             }

}

}