[求助]这个问题如何解决 ,关于NullPointerException

patricknb 发布于 2007-10-21 07:34， 217 次点击

public class CoordinateMaker
{
public static void createCoordinate(Coordinate newCoordinate, int rows, int columns)
{
newCoordinate = new Coordinate(rows, columns);
}

public static void main(String[] args)
{
Coordinate coord = null;
createCoordinate(coord, 3, 7);
System.out.println("coord has the value (" + coord.getRow() + ", " + coord.getCol() + ")");
}
}

1 回复

sayadiva2007-10-21 08:15

以下是引用patricknb在2007-10-21 7:34:06的发言：
public class CoordinateMaker
{
public static Coordinate createCoordinate(Coordinate newCoordinate, int rows, int columns)
{
newCoordinate = new Coordinate(rows, columns);
return newCoordinate;
}

public static void main(String[] args)
{
Coordinate coord = null;
coord = createCoordinate(coord, 3, 7);
System.out.println("coord has the value (" + coord.getRow() + ", " + coord.getCol() + ")");
}
}