operation.java

Calculator:可以计算各种基础表达式的计算器,比如3x+5x^2(x=3)

/*
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package Calculator;

/**
 *
 * @author asus
 */
public class Operation{

	public static boolean isBiOperator(Object operator){
		if(operator.equals("+")||operator.equals("-")||
			operator.equals("*")||operator.equals("/"))
			return true;
		else return false;
	}
	public static boolean isParenthesis(Object operator){
		if(operator.equals("(")||operator.equals(")"))
			return true;
		else return false;
	}
	public static boolean isUnOperator(Object operator){
		if (operator.equals("sin")||operator.equals("tan")||
				operator.equals("cos")||operator.equals("sqr")||
				operator.equals("log"))
			return true;
		else return false;
	}
	public static int priority(Object operator){
		if(operator.equals("+")||operator.equals("-")) return 1;
		else if(operator.equals("*")||operator.equals("/")) return 2;
		else return -1;
	 }
}