求一道Java题的答案 请高手指教!

public class Matrix { public Matrix(int rows, int cols, doub
求一道Java题的答案 请高手指教!
public class Matrix {
public Matrix(int rows, int cols, double[][] data) {
this.rows = rows;
this.cols = cols;
this.data = data;
}
public Matrix(int rows, int cols) {
this.rows = rows;
this.cols = cols;
}
public Matrix() {
}
public int rows;
public int cols;
public double[][] data;

public double[][] getData(int row,int col){
return null;
}
public void setData (int row,int col,double value){

}
public void multiply(Matrix m){

}
@Override
public String toString() {
return super.toString();
}
}

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