得到了ArrayIndexOutOfBoundsException

Question

我从ExperimenalImpl获得了数据库和相关方法的时间，价值，权重。值显示在表格中。当我们选择特定行时，相关的getXxx（）方法将调用。但有些行正在正确获取数据。只有一行给出此例外。

Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException
            at java.lang.System.arraycopy(Native Method)
            at com.integrativebioinformatics.processdb.pdbnt.IBExperimentalDataImpl.getWeights(IBExperimentalDataImpl.java:103)
            at com.insilicalabs.processdb.ui.controllers.ExperimentalDataController.showExperiment(ExperimentalDataController.java:197)
            at com.insilicalabs.processdb.ui.controllers.ExperimentalDataController.showExperimentAtIndex(ExperimentalDataController.java:184)   

代码：

    public void setWeights(double[] experimentWeigths) {
            if (experimentWeigths == null) throw new IllegalArgumentException("cannot take a null argument");
            this.experimentWeigths = new double[experimentWeigths.length];
            System.arraycopy(experimentWeigths, 0, this.experimentWeigths, 0, experimentWeigths.length);
            for(int i=0;i<this.experimentWeigths.length;i++){
                System.out.println("Weights : "+ experimentWeigths[i]);
            }
        }


public double[] getWeights() {
        double[] newWeights = new double[this.experimentTimeValuePairs[0].length];
        if(this.experimentTimeValuePairs[0].length != 0){
            System.arraycopy(this.experimentWeigths, 0, newWeights, 0, this.experimentWeigths.length);//Here, the ArrayIndexOutOfBoundsException occured.

            for (int i = this.experimentWeigths.length; i < this.experimentTimeValuePairs[0].length; ++i) {
                newWeights[i] = (0.0D / 0.0D);
            }
        }   

        return newWeights;
    }


    public double[][] getTimeValuePairs() {
            double[][] newPairs = new double[2][this.experimentTimeValuePairs[0].length];
            System.arraycopy(this.experimentTimeValuePairs[0], 0, newPairs[0], 0, this.experimentTimeValuePairs[0].length);
            System.arraycopy(this.experimentTimeValuePairs[1], 0, newPairs[1], 0, this.experimentTimeValuePairs[1].length);

            return newPairs;
        }


public double[][] getTimeValuePairs() {
        double[][] newPairs = new double[2][this.experimentTimeValuePairs[0].length];
        System.arraycopy(this.experimentTimeValuePairs[0], 0, newPairs[0], 0, this.experimentTimeValuePairs[0].length);
        System.arraycopy(this.experimentTimeValuePairs[1], 0, newPairs[1], 0, this.experimentTimeValuePairs[1].length);
        System.out.println("Called getTimeValuePairs() from IBExperimentalDataImpl : "+this.experimentTimeValuePairs);
        return newPairs;
    }

Answer 1

您使用此长度newWeights，

分配this.experimentTimeValuePairs[0].length数组

但是在arrayCopy中您正在使用this.experimentWeigths.length。

您可能应该newWeights分配this.experimentWeigths.length，因为这就是您要复制的内容。

Answer 2

查看System.ArrayCopy API，它说：

Otherwise, if any of the following is true, an IndexOutOfBoundsException is thrown and the destination is not modified:

The srcPos argument is negative.
The destPos argument is negative.
The length argument is negative.
srcPos+length is greater than src.length, the length of the source array.
destPos+length is greater than dest.length, the length of the destination array. 

我首先要调试你的程序，看看发生了哪些情况。