示例:
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
public class Demo01 {
public static void main(String[] args) {
List list=new ArrayList();
list.add(4);
list.add(9);
list.add(3);
list.add(8);
for(int m:list){
System.out.print(m+" ");
}
System.out.println();
System.out.println("*****排序*****");
Collections.sort(list);//通过sort方法来排序
for (int m:list){
System.out.print(m+" ");
}
}
}



