point.java

递归子程序法：对应每个非终结符语法单元编一个独立的处理过程（或子程序）。语法分析从读入第一个单词开始

	package point;							// 定义Java包，包名为point
	/** 
	 * Java语言实验参考程序
	 * Company 北京师范大学计算机系
 
	 * @author 孙一林
	 * @version 1.0
	 */
	class Point {						// 声明一个“点”类
	  private int x0;
	  private int y0;
	  private int x;
	  private int y;
	  public Point() {
	    this.x0 = 0;
	    this.y0 = 0;
	    this.x = 0;
	    this.y = 0;
	  }
	  public Point(int newX0,int newY0) {
	    this.x0 = newX0;
	    this.y0 = newY0;
	    this.x = newX0;
	    this.y = newX0;
	  }
	  public void setX(int newX) {
	    x = newX + x0;
	  }
	  public int getX() {
	    return x;
	  }
	  public void setY(int newY) {
	    y = newY + y0;
	  }
	  public int getY() {
	    return y;
	  }
	}