我想迭代一个HashSet的Integer对象,我想要计算一个元素出现的次数。这是我的方法到目前为止 public int freq(int element) {
int numElements = 0;
for (int atPos : mySet){
if (mySet.atPos == element){ //says atPos cannot be res
,这里是我的尝试 public class blah {
HashSet<something> blah;
public Blah() {
this.blah = new HashSet<something>(); //this is empty constructor of something
}
//我想公共嗒嗒的所有元素复制在新布拉赫 public Blah(Bl