Question

我的项目要求我使用列表创建一个FIFO队列，我必须创建简单的方法来放置，删除和返回对象等。但是当我编译以下代码时：

import java.io.PrintStream;
import java.util.NoSuchElementException;

class IntQueueImpl  { 

public int size;
private Node head, tail; 
private class Node { 
    int item; 
    Node next; 
    Node(int item) { 
        this.item = item; 
        next = null; }
        } 

IntQueueImpl(int max) { 
    head = null; tail = null; 
    }


public boolean isEmpty() { 
    return (head == null); 
    }

    public void put(int item) { 
    Node t = tail; 
    tail = new Node(item); 
    if (isEmpty()) head = tail; 
    else t.next = tail;
    size++;
    } 


public int get() throws NoSuchElementException;{ 
    if ( isEmpty() ) 
    throw new NoSuchElementException();
    int v = head.item; 
    Node t = head.next; 
    head = t; 
    return v;

    } 

    public int peek() throws NoSuchElementException{
    if ( isEmpty() ){ 
    throw new NoSuchElementException();
    }
    int peekelement =head.item;
    return peekelement;
    } 


    public int size(){

    if(isEmpty()) return 0;

    else return size;

    }

}

它给了我以下错误：

 IntQueueImpl.java:35: error: missing method body, or declare abstract
    public int get() throws NoSuchElementException;{
               ^
 IntQueueImpl.java:41: error: return outside method
            return v;

我必须弄清楚它意味着什么或如何解决它....

Answer 1

在第34行，你有：

public int get() throws NoSuchElementException;{

删除该分号，看看是否修复了编译器错误：

public int get() throws NoSuchElementException {

Answer 2

如何删除＆＃39 ;;＆＃39 ;?在public＆＃34; int get（）抛出NoSuchElementException; {＆＃34;

使用列表创建队列时编译错误

2 个答案: