我正在获取java.lang.OutOfMemoryError:Java堆空间。我不确定自己在做什么错。这是我的代码:
StringBuffer finalString = new StringBuffer();
try {
BufferedReader br = new BufferedReader(new FileReader("collegeData 2.txt"));
StringBuffer returnFile = new StringBuffer();
returnFile.append(br.readLine() + br.readLine());
ArrayList<String> allData = new ArrayList<String>();
boolean completedFirstSection = false;
int count = 2;
String addString = "";
String nextLine;
while ((nextLine=br.readLine())!=null) {
if(count < 990) {
addString += nextLine;
count++;
} else {
String sub = nextLine.substring(16);
sub = sub.substring(0, sub.length());
addString = sub + ":{" + nextLine + "," + addString.substring(0, addString.length()-2) + br.readLine();
br.readLine();
allData.add(addString);
count = 2;
}
}
allData.add("}}]");
System.out.println("here");
System.out.println(returnFile.toString());
finalString = returnFile;
br.close();
} catch (IOException e) {
e.printStackTrace();
}
collegeData 2.txt是44.2 mb,它是一个json文件。这是我的错误信息。
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
at java.base/jdk.internal.misc.Unsafe.allocateUninitializedArray(Unsafe.java:1250)
at java.base/java.lang.invoke.StringConcatFactory$MethodHandleInlineCopyStrategy.newArray(StringConcatFactory.java:1605)
at java.base/java.lang.invoke.DirectMethodHandle$Holder.invokeStatic(DirectMethodHandle$Holder)
at java.base/java.lang.invoke.LambdaForm$BMH/754666084.reinvoke(LambdaForm$BMH)
at java.base/java.lang.invoke.LambdaForm$MH/801197928.linkToTargetMethod(LambdaForm$MH)
at RunnerCombined.main(RunnerCombined.java:31)
RunnerCombined.java:31是上面的“ addString + = nextLine”。
预先感谢您的帮助!
最佳答案
谢谢twain249!在将代码更改为此之后,我的程序可以快速运行并且非常完美!
StringBuffer finalString = new StringBuffer();
try {
BufferedReader br = new BufferedReader(new FileReader("collegeData 2.txt"));
StringBuffer returnFile = new StringBuffer();
returnFile.append(br.readLine() + "\n" + br.readLine() + "\n");
boolean completedFirstSection = false;
int count = 2;
StringBuffer addString = new StringBuffer();
String nextLine;
while ((nextLine=br.readLine())!=null) {
if(count < 990) {
addString.append(nextLine + "\n");
count++;
} else {
String sub = nextLine.substring(16);
sub = sub.substring(0, sub.length());
// addString = sub + ":{" + nextLine + "," + addString.substring(0, addString.length()-2) + br.readLine();
returnFile.append(sub + ":{" + nextLine + "," + "\n");
returnFile.append(addString.substring(0, addString.length()-2) + "\n");
returnFile.append(br.readLine() + "\n");
addString.setLength(0);
count = 2;
br.readLine();
}
}
returnFile.append("}}]");
finalString = returnFile;
br.close();
} catch (IOException e) {
e.printStackTrace();
}