线程"main"中的异常java.lang.OutOfMemoryError:eclipse中的Java堆空间

Question

嗨,我正在从工作.xls表中读取包含8500数据行的数据,我正在尝试将其存储double[][]但我收到错误

Exception in thread "main" java.lang.OutOfMemoryError: Java heap space

码

public static double[][] getData_DoubleArray(String path, int sheetNo, int rowIndex1, int rowIndex2) {
    double[][] doubleArray=null;
    try {
        HSSFSheet sheet = PS_ExcelReader.getWorkSheet(path,sheetNo);
        System.out.println("sheet" + sheet);
        List<Object> data1 =  PS_ExcelReader.getFullColumnByIndex(sheet, rowIndex1);

        List<Object> data2 =  PS_ExcelReader.getFullColumnByIndex(sheet, rowIndex2);
        doubleArray = new double[data1.size()][data2.size()];
        for(int i = 0; i < data1.size(); i++) {
            for(int j = 0; j < data2.size(); j++) {
                doubleArray[i][0] = (Double)data1.get(i);
                doubleArray[i][1] = (Double)data2.get(j);
            }               
        }
        System.out.println("array  " + Arrays.deepToString(doubleArray));
    } 
    catch(IOException ioe) {
        log.error("data mis match");    
    }
    return doubleArray;       
}

Answer 1

目前这一行:

doubleArray = new double[data1.size()][data2.size()];

正在创造8500 x 8500双打,超过500MB.你基本上分配的空间足够8500和8500列.

但是看到你在算法中只使用了其中两列:

doubleArray[i][0] = (Double)data1.get(i);
doubleArray[i][1] = (Double)data2.get(j);

我怀疑你真的想要创建那么多列.鉴于您的剩余算法,此分配应满足您的需求:

doubleArray = new double[data1.size()][2];