java 标记上的类型语法错误，错位的构造
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时间：2020-10-31 01:11:17 来源:igfitidea点击:
Type Syntax error on token(s), misplaced construct(s)
提问by shutdowncore
package list;
public class LinkedList implements List {
//Datenfeld
private Element item;
//Zeigerfeld
private LinkedList next;
//Konstruktor, erzeugt leere Liste
public LinkedList() {
item = null;
next = null;
}
//Selektoren
public Object getItem() {
return item;
}
public LinkedList next() {
return next;
}
//ist die Liste leer?
public boolean isEmpty() {
return next == null;
}
public Object firstElement() {
if (isEmpty())
return null;
else
return next.item;
}
public int length() {
if (isEmpty())
return 0;
else
return 1 + next.length();
}
//fügt x am Kopf ein
public LinkedList insert(Element x) {
LinkedList l = new LinkedList();
l.item = x;
l.next = next;
next = l;
return this;
}
//h?ngt das x ans Ende der Liste und liefert Teilliste
public LinkedList append (Element x) {
if (isEmpty())
return insert(x);
else
return next.append(x);
}
//liefert Null, falls x nicht in Liste
//sonst Teilliste
private LinkedList find(Element x) {
if (isEmpty())
return null;
else
if (firstElement().equals(x))
return this;
else
return next.find(x);
}
//entfertn erstes x der Liste
public LinkedList delete(Element x) {
LinkedList l = find(x);
if (l != null)
return l.next = l.next.next;
else
return this;
}
//entfernt das erste Element der Liste
public LinkedList delete() {
if (!isEmpty())
next = next.next;
return this;
}
public boolean isInList(Element x) {
return(find(x) != null);
}
public String toString() {
return (next == null ? " |--" : " --> " + next.item + next);
}
static void println(Element x) {
System.out.println(x.toString());
}
public LinkedList add(Element x, int n) {
return null;
}
public LinkedList remove(int n) {
return null;
}
public Element get(int n) {
return null;
}
public int firstIndexOf(Element x) {
return 1;
}
public int lastIndexOf(Element x) {
return 1;
}
LinkedList l1 = new LinkedList();
l1.insert("AA");
}
In the last line (l1.insert("AA");I get the error
在最后一行(l1.insert("AA");我收到错误
Type Syntax error on token(s), misplaced construct(s).
Need help. Can't find the problem.
需要帮忙。找不到问题。
回答by Mat
You can't have random statements like that outside of methods. You need to put that statement in a method, or build a class that uses your linked lists and does that insert.
你不能在方法之外有这样的随机语句。您需要将该语句放在一个方法中，或者构建一个使用您的链表并执行插入操作的类。
