This question already has an answer here: Create ArrayList from array 32 answers To change code that uses an array into code that uses an ArrayList : Instead of a[i] , when it's not on the left side of an assignment, use a.get(i) Instead of a.length , use a.size() Instead of setting a[i] = expression : if i is known to be in range (0 <= i <= a.length-1 ), use a.set(i, expressi
这个问题在这里已经有了答案: 从数组32中创建ArrayList答案 要将使用数组的代码更改为使用ArrayList代码: 如果不是a[i] ,当它不在任务的左侧时,请使用a.get(i) 取而代之的a.length ,使用a.size() 而不是设置a[i] = expression :如果i知道在范围内(0 <= i <= a.length-1 ),请使用a.set(i, expression) 。 如果i == a.length ,你不能在数组中使用a[i] = expression ,但是你可以用一个ArrayList ,将大
This question already has an answer here: Create ArrayList from array 32 answers However I have the following error on the 2 lines before cc = cc + 1. "cards cannot be resolved to a variable" That means that you haven't declared cards in a way / place that allows draw() to see the declaration. You say: In the main method the Array cards contains 52 card objects each with t
这个问题在这里已经有了答案: 从数组32中创建ArrayList答案 不过,在cc = cc + 1之前的两行中,我有以下错误:“卡无法解析为变量” 这意味着你没有以允许draw()看到声明的方式/地方声明cards 。 你说: 在主要方法中,阵列卡包含52个卡片对象,每个卡片对象都有自己的数据。 这听起来像你已经宣布cards main方法内的局部变量。 局部变量只在当前方法体中的语句的范围内。 cards数组或者需要声明为封闭类的字段,
This question already has an answer here: Create ArrayList from array 32 answers 你可以做类似的事情List<Employee> companyTeam = Arrays.asList(manager, engineer1, superviso1, accountant, intern); Employee[] companyTeam = {manager, engineer1, superviso1, accountant, intern }; List<Employee> list=Arrays.asList(companyTeam);// array to List 你已经有了一个数组,所以你可以使用Arrays.a
这个问题在这里已经有了答案: 从数组32中创建ArrayList答案 你可以做类似的事情List<Employee> companyTeam = Arrays.asList(manager, engineer1, superviso1, accountant, intern); Employee[] companyTeam = {manager, engineer1, superviso1, accountant, intern }; List<Employee> list=Arrays.asList(companyTeam);// array to List 你已经有了一个数组,所以你可以使用Arrays.asList(companyTeam)将数组
Possible Duplicate: How to create ArrayList (ArrayList<T>) from array (T[]) in Java How to implement this method: List<Integer> toList(int[] integers) { ??? //return Arrays.asList(integers); doesn't work } There's probably a built-in method to do it somewhere* (as you note, Arrays.asList won't work as it expects an Integer[] rather than an int[] ). I don't
可能重复: 如何在Java中从数组(T [])创建ArrayList(ArrayList <T>) 如何实现这个方法: List<Integer> toList(int[] integers) { ??? //return Arrays.asList(integers); doesn't work } 可能有一个内置方法可以在某处执行*(如您所注意的, Arrays.asList不会像预期的Integer[]而不是int[] )那样工作。 我不太清楚Java库是否足以告诉你它在哪里。 但是写你自己很简单: public static List&
This question already has an answer here: Create ArrayList from array 32 answers 尝试这个tempList.addAll(Arrays.asList(temp)); 使用以下List<File>tempList = Arrays.asList(temp); 您可以遍历数组并将每个元素添加到列表中。 for (File each : temp) tempList.add(each);
这个问题在这里已经有了答案: 从数组32中创建ArrayList答案 尝试这个tempList.addAll(Arrays.asList(temp)); 使用以下List<File>tempList = Arrays.asList(temp); 您可以遍历数组并将每个元素添加到列表中。 for (File each : temp) tempList.add(each);
Possible Duplicate: How to create ArrayList (ArrayList<T>) from array (T[]) in Java I have: String[] time = {"22:22:22","22:22:23"}; Array asd = null; How can I put something like asd=time ? I assume that what you actually need is a java.sql.Array , since you mention jdbc and setArray in some of your comments. Three options: Try Connection.createArrayOf() . This might or might
可能重复: 如何在Java中从数组(T [])创建ArrayList(ArrayList <T>) 我有: String[] time = {"22:22:22","22:22:23"}; Array asd = null; 我怎么能把类似asd=time ? 我假设你实际需要的是一个java.sql.Array ,因为你在一些评论中提到了jdbc和setArray 。 三种选择: 尝试Connection.createArrayOf() 。 这可能也可能不可用,具体取决于您使用的JDBC驱动程序。 编写你自己的实现java.sql.Array的类。
This question already has an answer here: Create ArrayList from array 32 answers As an ArrayList that line would be import java.util.ArrayList; ... ArrayList<Card> hand = new ArrayList<Card>(); To use the ArrayList you have do hand.get(i); //gets the element at position i hand.add(obj); //adds the obj to the end of the list hand.remove(i); //removes the element at position i h
这个问题在这里已经有了答案: 从数组32中创建ArrayList答案 作为该行将是的ArrayList import java.util.ArrayList; ... ArrayList<Card> hand = new ArrayList<Card>(); 要使用ArrayList你需要做的 hand.get(i); //gets the element at position i hand.add(obj); //adds the obj to the end of the list hand.remove(i); //removes the element at position i hand.add(i, obj); //adds the obj at the spe
This question already has an answer here: Create ArrayList from array 32 answers Initialization of an ArrayList in one line 32 answers Arrays.asList可以在这里帮助: new ArrayList<Integer>(Arrays.asList(1,2,3,5,8,13,21)); Yes. new ArrayList<String>(){{ add("A"); add("B"); }} What this is actually doing is creating a class derived from ArrayList<String> (the outer s
这个问题在这里已经有了答案: 从数组32中创建ArrayList答案 在一行中初始化ArrayList 32个答案 Arrays.asList可以在这里帮助: new ArrayList<Integer>(Arrays.asList(1,2,3,5,8,13,21)); 是。 new ArrayList<String>(){{ add("A"); add("B"); }} 这实际上做的是创建一个从ArrayList<String>派生的类(外层的大括号做这个),然后声明一个静态初始化器(内置的大括号)。 这实际上是一个内部
We all know you can't do this: for (Object i : l) { if (condition(i)) { l.remove(i); } } ConcurrentModificationException etc... this apparently works sometimes, but not always. Here's some specific code: public static void main(String[] args) { Collection<Integer> l = new ArrayList<Integer>(); for (int i=0; i < 10; ++i) { l.add(new Integ
我们都知道你不能这样做: for (Object i : l) { if (condition(i)) { l.remove(i); } } ConcurrentModificationException等...这显然有效,但并不总是。 以下是一些特定的代码: public static void main(String[] args) { Collection<Integer> l = new ArrayList<Integer>(); for (int i=0; i < 10; ++i) { l.add(new Integer(4)); l.add(new Integer(5));
I recently found out that there are actually 2 different ArrayList implementations in Java (better late than never I guess...). So I was wondering why does Arrays.asList(T... a) need to return a list which can not be resized ? If they needed an unmodifiable list why add the set(int index, E element) method then ? So my general question is why not return the java.util.ArrayList from the Array
我最近发现在Java中实际上有2个不同的ArrayList实现(比我猜想的晚得多)。 所以我想知道为什么Arrays.asList(T... a)需要返回一个无法调整大小的列表? 如果他们需要一个不可修改的列表,为什么要添加set(int index, E element)方法呢? 所以我的一般问题是为什么不从Arrays.asList(T... a)方法返回java.util.ArrayList ? 你也可以从java.util.Arrays.ArrayList实现中获得什么? 你问: 你也可以从java.util.Arrays