Question

public static List<double[]> pc = new LinkedList();

public void fillTable1() {
    int index = getWorstI();
    double[] temp = pc.get(index);
    for(int n=0;n<4;n++)
    System.out.println( temp[n]);

    for(int i=0;i<4;i++)
    {
        for(int j=0;j<4;j++)
       (pc.get(i))[j]/=temp[j]; // values change only in object pc.get(1)!  O_o


    }
    for(int i=0;i<4;i++)
        Main.fillTheRow(table1, pc.get(i), i);

}

Answer 1

It is assumed to be only pc.get(0) that the value is correctly changed.

The variable temp and pc.get(0) is reference to same object.
So the results of “(pc.get(0))[j]/=temp[j]” will be all “1”.
Therefor all the calculations after that become (pc.get(i))[j]/1 .

Change as follows not to become a reference.

double[] temp = new double[pc.get(index).length]; // new array
for(int n=0;n<4;n++) {
    temp[n] = pc.get(index)[n]; // copy content
    System.out.println(temp[n]);
}