Исходный текст программы NoPointers.java

Назад

// =======================================
// NoPointers.java
//
// (C) Alexandr Frolov, 1998
// E-mail: frolov@glasnet.ru
// Web:    http://www.glasnet.ru/~frolov
// =======================================

public class NoPointers
{
  public static void main(String args[]) 
  {
    int intVar;
    Integer integerVar;
    int[] iDim = new int[5];
    

    intVar = 5;
    integerVar = new Integer(7);
    iDim[0] = 9;
    MyPoint mp = new MyPoint(1,1);
    

    System.out.println("Before modification:"); 
    

    System.out.println("intVar = " + intVar); 
    System.out.println("integerVar = " +
      integerVar); 
    System.out.println("iDim = " + iDim[0]); 
    mp.printPoint();
    

    ClearIntVar(intVar);
    ClearIntegerVar(integerVar);
    ClearDim(iDim);
    ClearMyPoint(mp);
    

    System.out.println("\nAfter modification:"); 
    

    System.out.println("intVar = " + intVar); 
    System.out.println("integerVar = " +
      integerVar); 
    System.out.println("iDim = " + iDim[0]); 
    mp.printPoint();
  }
  

  static void ClearIntVar(int v)
  {
    v = 0;
  }
  

  static void ClearIntegerVar(Integer v)
  {
    v = new Integer(0);
  }

  static void ClearMyPoint(MyPoint p)
  {
    p.setPoint(0,0);
  }
  

  static void ClearDim(int[] d)
  {
    d[0] = 0;
  }
}

class MyPoint
{
  private int m_x=0;
  private int m_y=0;
  

  MyPoint(int ix, int iy)
  {
    m_x = ix;
    m_y = iy;
  }
  

  public void setPoint(int ix, int iy)
  {
    m_x = ix;
    m_y = iy;
  }
  

  public void printPoint()
  {
    System.out.println("Point: (" 
     + m_x + "," + m_y + ")"); 
  }
}

Назад