www.pudn.com > Operate2.rar > Expression.java

package Expression; 
 
public class Expression { 
	private	Expression LeftExp;//左边表达式 
	private Expression RightExp;//右过表达式 
	private Expression Parent;//上一级表达式 
	private int PRI;//运算符关键字优先级,如果是值，此为-1 
	private String Parameter;//变量常量与值。 
	private int type;//运算符关键字类型，变量常量此值为-1；而且只有在叶子点上才会为-1，运算符关键字为0，,2表示根结点只有一个 
	private int Position; 
	 
	public Expression(){ 
		this.LeftExp = null; 
		this.RightExp = null; 
		this.Parent = null; 
		this.PRI =-1; 
		this.Parameter = null; 
		this.type = -1; 
		this.Position = -1; 
	} 
	 
	public Expression(int type){ 
		this.LeftExp = null; 
		this.RightExp = null; 
		this.Parent = null; 
		this.PRI =-1; 
		this.Parameter = null; 
		this.type = type; 
		this.Position = -1; 
	}	 
	 
	public Expression(int type,int PRI,int position, String parameter){ 
		this.LeftExp = null; 
		this.RightExp = null; 
		this.Parent = null; 
		this.PRI = PRI; 
		this.type = type; 
		this.Position = position; 
		this.Parameter = parameter; 
	} 
 
	public Expression getLeftExp() { 
		return LeftExp; 
	} 
 
	public void setLeftExp(Expression leftExp) { 
		LeftExp = leftExp; 
	} 
 
	public String getParameter() { 
		return Parameter; 
	} 
 
	public void setParameter(String parameter) { 
		Parameter = parameter; 
	} 
 
	public Expression getParent() { 
		return Parent; 
	} 
 
	public void setParent(Expression parent) { 
		Parent = parent; 
	} 
 
	public int getPRI() { 
		return PRI; 
	} 
 
	public void setPRI(int pri) { 
		PRI = pri; 
	} 
 
	public Expression getRightExp() { 
		return RightExp; 
	} 
 
	public void setRightExp(Expression rightExp) { 
		RightExp = rightExp; 
	} 
 
	public int getPosition() { 
		return Position; 
	} 
 
	public void setPosition(int position) { 
		Position = position; 
	} 
 
	public int getType() { 
		return type; 
	} 
 
	public void setType(int type) { 
		this.type = type; 
	} 
		 
}