integermatrix.java

此源码为机械工业出版社出版的《Java语言程序设计》第三版所配套的书中所有源代码。

// IntegerMatrix.java:
// Declare IntegerMatrix derived from GenericMatrix
public class IntegerMatrix extends GenericMatrix
{
  // Construct an IntegerMatrix
  public IntegerMatrix(Integer[][] m)
  {
    super(m);
  }

  // Implement the createGenericMatrix method
  public GenericMatrix createGenericMatrix()
  {
    Integer[][] matrix =
      new Integer[getMatrix().length][getMatrix().length];
    return new IntegerMatrix(matrix);
  }

  // Implement the add method for adding two matrix elements
  protected Object add(Object o1, Object o2)
  {
    Integer i1 = (Integer)o1;
    Integer i2 = (Integer)o2;
    return new Integer(i1.intValue() + i2.intValue());
  }

  // Implement the multiply method for multiplying two
  // matrix elements
  protected Object multiply(Object o1, Object o2)
  {
    Integer i1 = (Integer)o1;
    Integer i2 = (Integer)o2;
    return new Integer(i1.intValue() * i2.intValue());
  }

  // Implement the zero method to specify zero for Integer
  protected Object zero()
  {
    return new Integer(0);
  }
}