a1.add(2,new Bread(1, "荷葉", "小", "饅頭"));a1.add(1,new Bread(2, "飄香", "中", "蛋黃派"));a1.add(0,new Bread(3, "巨無霸", "大", "漢堡包"));按0，1，2來添加就沒事，可是一調過來就異常，為什么呢？代碼：public class Bread {int num;String brand;String size;String type;public Bread(int num, String brand, String size, String type) {super();this.num = num;this.brand = brand;this.size = size;this.type = type;}public String toString() {return num+":"+brand+size+type;}}import java.util.ArrayList;import java.util.LinkedList;public class Example {public static void main(String[] args) {LinkedList<Bread> a1=new LinkedList<Bread>();a1.add(2,new Bread(1, "荷葉", "小", "饅頭"));a1.add(1,new Bread(2, "飄香", "中", "蛋黃派"));a1.add(0,new Bread(3, "巨無霸", "大", "漢堡包"));for(int j=0;j<a1.size();j++){Bread ss=a1.get(j);System.out.println(ss);}}}
請問一下在java中的arrayList,為什么這么寫就異常呢？
慕碼人2483693
2022-01-20 19:15:51
