import java.util.*;
public class Mapit {
public static void main(String[] args) {
Set set = new HashSet();
Integer i1 = 45;
Integer i2 = 46;
set.add(i1);
set.add(i1);
set.add(i2);
System.out.print(set.size() + " "); //2
set.remove(i1);
System.out.print(set.size() + " "); //1
i2 = 47;
set.remove(i2);
System.out.print(set.size() + " "+set); //1 为什么打印1啊。我觉得应该打印0啊。因为已经移除了啊,里面什么都没有了啊
}
}
public class Mapit {
public static void main(String[] args) {
Set set = new HashSet();
Integer i1 = 45;
Integer i2 = 46;
set.add(i1);
set.add(i1);
set.add(i2);
System.out.print(set.size() + " "); //2
set.remove(i1);
System.out.print(set.size() + " "); //1
i2 = 47;
set.remove(i2);
System.out.print(set.size() + " "+set); //1 为什么打印1啊。我觉得应该打印0啊。因为已经移除了啊,里面什么都没有了啊
}
}