索引越界错误 [英] Index out of bounds error

问题描述

我正在开发一个程序，我正在将保存的小部件重新创建回边界面板.当我创建它们时，我也试图将值放入 ArrayList 中，这样如果我想更新和保存打开的项目，我应该能够通过从 ArrayList 获取值来做到这一点.

I am working on a program where i am recreating the saved widgets back on to the boundary panel. When i am creating them i am also trying to put the values into the ArrayList so that if i want to update and save the opened project i should be able to do so by getting the values from the ArrayList.

代码如下:

for(int i = 0; i < result.length; i++){
                if(ename.contains(result[i].getParticipateEntityName())){
                        ername.add(ename.indexOf(result[i].getParticipateEntityName()), result[i].getParticipateRelatioshipName());
                        etotalpartial.add(ename.indexOf(result[i].getParticipateEntityName()), result[i].getTotalPartial());
                }else if(wename.contains(result[i].getParticipateEntityName())){
                        wrname.add(wename.indexOf(result[i].getParticipateEntityName()), result[i].getParticipateRelatioshipName());
                }
}

这里的ename、ername、etotalpartial、wename和wrname都是ArrayList.这段代码包含在一个异步类方法中.

Here ename, ername, etotalpartial, wename and wrname are all ArrayList. This piece of code is included in an asynchronous class method.

当我运行代码时，我在ername.add(ename......"处出现错误.

When i run the code i get error at "ername.add(ename......".

这是错误堆栈:

java.lang.IndexOutOfBoundsException: Index: 1, Size: 0
    at java.util.ArrayList.add(ArrayList.java:367)
    at com.e.r.d.client.ERD1$16.onSuccess(ERD1.java:898)
    at com.e.r.d.client.ERD1$16.onSuccess(ERD1.java:1)
    at com.google.gwt.user.client.rpc.impl.RequestCallbackAdapter.onResponseReceived(RequestCallbackAdapter.java:216)
    at com.google.gwt.http.client.Request.fireOnResponseReceived(Request.java:287)
    at com.google.gwt.http.client.RequestBuilder$1.onReadyStateChange(RequestBuilder.java:393)
    at sun.reflect.GeneratedMethodAccessor16.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
    at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
    at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:157)
    at com.google.gwt.dev.shell.BrowserChannel.reactToMessagesWhileWaitingForReturn(BrowserChannel.java:1713)
    at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:165)
    at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:120)
    at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:507)
    at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:264)
    at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:91)
    at com.google.gwt.core.client.impl.Impl.apply(Impl.java)
    at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:188)
    at sun.reflect.GeneratedMethodAccessor9.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
    at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
    at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:157)
    at com.google.gwt.dev.shell.BrowserChannel.reactToMessages(BrowserChannel.java:1668)
    at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:401)
    at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:222)
    at java.lang.Thread.run(Thread.java:619)

我不确定我做错了什么.

I am not sure what i am doing wrong.

任何输入都会有很大帮助.

Any input will be of great help.

谢谢.

推荐答案

看起来 ername 或 wrname 是一个空数组列表.ername.size() 可能会返回 0 顺便说一句...

Well it looks like ername or wrname is an empty array list. ername.size() will probably return 0 by the way...

您要么想使用 add(Object object) 方法，要么您可以通过插入以下代码来初始化容量:

You either want to use the add(Object object) method, or you can initialize a capacity by inserting the following code:

for (int i = 0; i < CAPACITY; i++){
   ername.add(null);
}

然后你的代码应该可以工作......

and then your code should work...

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