datastringdeal.java

来自「做了一个还算复杂的计算器,还是有一定的 参考价值的(比较适合中初级者)」· Java 代码 · 共 1,041 行 · 第 1/3 页

/**
 * @(#)DataStringDeal.java
 *
 *
 * @author 
 * @version 1.00 2007/5/12
 */

//表达式字符串处理类
import java.util.*;
import java.awt.*;
import javax.swing.*; 
public class DataStringDeal{
    private String[] string;
    private int count;
    public DataStringDeal() {
    }
    public DataStringDeal(String[] string,int count){
    	this.string = string;
    	this.count = count;
    }
    public String doOperation(){
    	int leftNum = 0;
    	int rightNum = 0;
    	//以下代码是用来检验表达式的合法性
    	//以及检验该表达式是否具有歧义
    	
    	//对括号合法性的检测
    	for (int i=0;i<=count;i++){
    	    if (string[i]=="(")
    	    	leftNum++;
    	    if (string[i]==")")
    			rightNum++;
    		if (leftNum<rightNum)
    			return "The expression is not valid!";
    	}
    	if (leftNum!=rightNum)
    		return "The expression is not valid!";
    	for (int i=0;i<=count;i++){
        	//对指数运算的检查
        	if (string[i]=="^"){
        	    if (i==0)
        	    	return "The Expression is not valid \nor may be misconceived!\nYou must enter the start button to restart!";
        	    if (i==count)
        	    	return "The Expression is not valid \nor may be misconceived!\nYou must enter the start button to restart!";
        	    if (string[i+1]=="log"||string[i+1]=="n!"||string[i+1]==")"||string[i+1]=="^"||string[i+1]=="+"
        	    	||string[i+1]=="-"||string[i+1]=="*"||string[i+1]=="/"||string[i+1]==")")
        	    	return "The Expression is not valid \nor may be misconceived!\nYou must enter the start button to restart!";
        	    if ((string[i+2]=="log"||string[i+2]=="^")&&((i+2)<=count))
        	    	return "The Expression is not valid \nor may be misconceived!\nYou must enter the start button to restart!";
        	}
        	//对LOG的检查
        	if (string[i]=="log"){
        		if (i==0)
        	    	return "The Expression is not valid \nor may be misconceived!\nYou must enter the start button to restart!";
        	    if (i==count)
        	    	return "The Expression is not valid or may be misconceived!\rYou must enter the start button to restart!";
        	    if (string[i+1]=="log"||string[i+1]=="n!"||string[i+1]==")"||string[i+1]=="^"||string[i+1]=="+"
        	    	||string[i+1]=="-"||string[i+1]=="*"||string[i+1]=="/"||string[i+1]==")")
        	    	return "The Expression is not valid \nor may be misconceived!\nYou must enter the start button to restart!";
        	    if ((string[i+2]=="log"||string[i+2]=="^")&&((i+2)<=count))
        	    	return "The Expression is not valid \nor may be misconceived!\nYou must enter the start button to restart!"; 
        	}
        	//对N!的检查
            if (string[i]=="n!"){
            	if (i==0)
            		return "The Expression is not valid \nor may be misconceived!\nYou must enter the start button to restart!";
            	if ((Double.parseDouble(string[i-1])-(int)(Double.parseDouble(string[i-1])))!=0||Double.parseDouble(string[i-1])<0)
            		return "The Expression is not valid \nor may be misconceived!\nYou must enter the start button to restart!";
            	if ((string[i+1]!="+"&&string[i+1]!="-"&&string[i+1]!="*"&&string[i+1]!="/"&&string[i+1]!=")")&&(i<=count-1))
            		return "The Expression is not valid \nor may be misconceived!\nYou must enter the start button to restart!";
            }
            //对LN的检查
            if (string[i]=="ln"){
            	if (i==count)
            	    return "The Expression is not valid"+ '\n'+"or may be misconceived!\nYou must enter the start button to restart!";
            	if (string[i+1]=="+"||string[i+1]=="-"||string[i+1]=="*"||string[i+1]=="/")
            		return "The Expression is not valid \nor may be misconceived!\nYou must enter the start button to restart!";
            	if (string[i+1]=="log"||string[i+1]=="^"||string[i+1]==")")
            		return "The Expression is not valid \nor may be misconceived!\nYou must enter the start button to restart!";	
            }
            //对sqrt的检查
            if (string[i]=="sqrt"){
            	if (i==count)
            		return "The Expression is not valid \nor may be misconceived!\nYou must enter the start button to restart!";
            	if (string[i+1]==")"||string[i+1]=="log"||string[i+1]=="^")
            		return "The Expression is not valid \nor may be misconceived!\nYou must enter the start button to restart!";
            	if (string[i+1]=="+"||string[i+1]=="-"||string[i+1]=="*"||string[i+1]=="/")
            		return "The Expression is not valid \nor may be misconceived!\nYou must enter the start button to restart!";
            }
            //对sqr的检查
            if (string[i]=="sqr"){
            	if (i==count)
            		return "The Expression is not valid \nor may be misconceived!\nYou must enter the start button to restart!";
            	if (string[i+1]==")"||string[i+1]=="log"||string[i+1]=="^")
            		return "The Expression is not valid \nor may be misconceived!\nYou must enter the start button to restart!";
            	if (string[i+1]=="+"||string[i+1]=="-"||string[i+1]=="*"||string[i+1]=="/")
            		return "The Expression is not valid \nor may be misconceived!\nYou must enter the start button to restart!";
            }
            //对cos的检查
            if (string[i]=="cos"){
            	if (i==count)
            		return "The Expression is not valid \nor may be misconceived!\nYou must enter the start button to restart!";
            	if (string[i+1]==")"||string[i+1]=="log"||string[i+1]=="^")
            		return "The Expression is not valid \nor may be misconceived!\nYou must enter the start button to restart!";
            	if (string[i+1]=="+"||string[i+1]=="-"||string[i+1]=="*"||string[i+1]=="/")
            		return "The Expression is not valid \nor may be misconceived!\nYou must enter the start button to restart!";
            }
            //对sin的检查
            if (string[i]=="sin"){
            	if (i==count)
            		return "The Expression is not valid \nor may be misconceived!\nYou must enter the start button to restart!";
            	if (string[i+1]==")"||string[i+1]=="log"||string[i+1]=="^")
            		return "The Expression is not valid \nor may be misconceived!\nYou must enter the start button to restart!";
            	if (string[i+1]=="+"||string[i+1]=="-"||string[i+1]=="*"||string[i+1]=="/")
            		return "The Expression is not valid \nor may be misconceived!\nYou must enter the start button to restart!";
            }
            //左括号的检查
            if (string[i]=="("){
            	if (i==count)
            		return "The Expression is not valid \nor may be misconceived!\nYou must enter the start button to restart!";
            	if (string[i+1]==")"||string[i+1]=="log"||string[i+1]=="^")
            		return "The Expression is not valid \nor may be misconceived!\nYou must enter the start button to restart!";
            	if (string[i+1]=="+"||string[i+1]=="-"||string[i+1]=="*"||string[i+1]=="/")
            		return "The Expression is not valid \nor may be misconceived!\nYou must enter the start button to restart!";
            }
            //对右括号的检查
            if (string[i]==")"){
            	if (i==1)
            		return "The Expression is not valid \nor may be misconceived!\nYou must enter the start button to restart!";
            	if (i<count)
            	    if (string[i+1]!="+"&&string[i+1]!="-"&&string[i+1]!="*"&&string[i+1]!="/"&&string[i+1]!=")"
            		    &&string[i+1]!="^"&&string[i+1]!="log")
            		    return "The Expression is not valid \nor may be misconceived!\nYou must enter the start button to restart!";
            }
            
            //对加号的检查
            if (string[i]=="+") {
            	if (i==count)
            		return "The Expression is not valid \nor may be misconceived!\nYou must enter the start button to restart!";
            	if (string[i+1]==")"||string[i+1]=="log"||string[i+1]=="^")
            		return "The Expression is not valid \nor may be misconceived!\nYou must enter the start button to restart!";
            	if (string[i+1]=="+"||string[i+1]=="-"||string[i+1]=="*"||string[i+1]=="/")
            		return "The Expression is not valid \nor may be misconceived!\nYou must enter the start button to restart!"; 
            }
            //对减号的检查
            if (string[i]=="-") {
            	if (i==count)
            		return "The Expression is not valid \nor may be misconceived!\nYou must enter the start button to restart!";
            	if (string[i+1]==")"||string[i+1]=="log"||string[i+1]=="^")
            		return "The Expression is not valid \nor may be misconceived!\nYou must enter the start button to restart!";
            	if (string[i+1]=="+"||string[i+1]=="-"||string[i+1]=="*"||string[i+1]=="/")
            		return "The Expression is not valid \nor may be misconceived!\nYou must enter the start button to restart!"; 
            }
            //对乘号的检查
            if (string[i]=="*") {
            	if (i==count)
            		return "The Expression is not valid \nor may be misconceived!\nYou must enter the start button to restart!";
            	if (string[i+1]==")"||string[i+1]=="log"||string[i+1]=="^")
            		return "The Expression is not valid \nor may be misconceived!\nYou must enter the start button to restart!";
            	if (string[i+1]=="+"||string[i+1]=="-"||string[i+1]=="*"||string[i+1]=="/")
            		return "The Expression is not valid \nor may be misconceived!\nYou must enter the start button to restart!"; 
            }
            //对除号的检查
            if (string[i]=="/") {
            	if (i==count)
            		return "The Expression is not valid \nor may be misconceived!\nYou must enter the start button to restart!";
            	if (string[i+1]==")"||string[i+1]=="log"||string[i+1]=="^")
            		return "The Expression is not valid \nor may be misconceived!\nYou must enter the start button to restart!";
            	if (string[i+1]=="+"||string[i+1]=="-"||string[i+1]=="*"||string[i+1]=="/")
            		return "The Expression is not valid \nor may be misconceived!\nYou must enter the start button to restart!"; 
            }
            
    	}	
    	//以上代码是用来检查表达式是否合法
        //如果有括号,进行处理的情况
        if (leftNum > 0){
            int num = 0;
            int[] list = new int[10];//记录左括号的位置 
            for (int i=0;i<=count;i++){
            	if (string[i]=="("){
            	    if (num>=list.length){
            	    	int[] temp = new int[list.length*2];
            	    	for (int k=0;k<list.length;k++)
            	    		temp[k]=list[k];
            	    	list=temp;
            	    }
            		list[num]=i;
            		num++;
            	}
            	if(string[i]==")"){
            		num--;
            		//下面的FOR语句是计算左右括号内的值
            		for (int j=list[num]+1;j<i;j++){
            			if (string[j]=="n!"){
            				double data = Double.parseDouble(string[j-1]);
            				if ((data-(int)data)!=0)
            					return "The Expression is not valid \nor may be misconceived!\nYou must enter the start button to restart!";
            				if (data<0)
            					return "The Expression is not valid \nor may be misconceived!\nYou must enter the start button to restart!";   
            				for (double fac=data-1;fac>0;fac--){
            					data = data*fac;
            				}
            				String dataString = String.valueOf(data);
            				string[j-1]=dataString;
            				for (int p=j;p<count;p++)
            					string[p]=string[p+1];
            				count=count-1;
            				i=i-1;
            			}
            			if (string[j]=="log"){
            				int p=j+1;//p是用来记录第一个得到的数字的数组位置
            				while (string[p]=="sin"||string[p]=="cos"||string[p]=="ln"||string[p]=="sqr"||string[p]=="sqrt")
            					p++;
            				double data = Double.parseDouble(string[p]);
            				if (data<=0)
            					return "The Expression is not valid \nor may be misconceived!\nYou must enter the start button to restart!"; 
            				if (Double.parseDouble(string[j-1])<=0||Double.parseDouble(string[j-1])==1)
            					return "The Expression is not valid \nor may be misconceived!\nYou must enter the start button to restart!"; 
            				p--;
            				int save=p;
            				for (;p>j;p--){
            					if (string[p]=="sin")
            						data=Math.sin(data);
            					if (string[p]=="cos")
            						data=Math.cos(data);
            					if (string[p]=="ln")
            						data=Math.log(data);
            					if (string[p]=="sqr")
            						data=Math.pow(data,2);
            					if (string[p]=="sqrt")
            						data=Math.sqrt(data);
            				}
            				data = Math.log10(data)/Math.log10(Double.parseDouble(string[j-1]));
            				String dataString = String.valueOf(data);
            				string[j-1]=dataString;
            				for (int m=j;m<count-(save-j+1);m++)
            					string[m]=string[m+save-j+2];
            				count=count-(save-j+2);
            				i=i-(save-j+2);
            			}
            			if (string[j]=="^"){
            				int p=j+1;//p是用来记录第一个得到的数字的数组位置
            				while (string[p]=="sin"||string[p]=="cos"||string[p]=="ln"||string[p]=="sqr"||string[p]=="sqrt")
            					p++;
            				double data = Double.parseDouble(string[p]);
            				p--;
            				int save=p;
            				for (;p>j;p--){
            					if (string[p]=="sin")
            						data=Math.sin(data);
            					if (string[p]=="cos")
            						data=Math.cos(data);
            					if (string[p]=="ln")
            						data=Math.log(data);
            					if (string[p]=="sqr")
            						data=Math.pow(data,2);
            					if (string[p]=="sqrt")
            						data=Math.sqrt(data);
            				}
            				data = Math.pow(Double.parseDouble(string[j-1]),data);
            				String dataString = String.valueOf(data);
            				string[j-1]=dataString;
            				for (int m=j;m<count-(save-j+1);m++)
            					string[m]=string[m+save-j+2];
            				count=count-(save-j+2);
            				i=i-(save-j+2);
            			}
            			if (string[j]=="sin"){
            				int p=j+1;//p是用来记录第一个得到的数字的数组位置
            				while (string[p]=="sin"||string[p]=="cos"||string[p]=="ln"||string[p]=="sqr"||string[p]=="sqrt")
            					p++;
            				double data = Double.parseDouble(string[p]);
            				p--;
            				int save=p;
            				for (;p>j;p--){
            					if (string[p]=="sin")
            						data=Math.sin(data);
            					if (string[p]=="cos")
            						data=Math.cos(data);
            					if (string[p]=="ln")
            						data=Math.log(data);
            					if (string[p]=="sqr")
            						data=Math.pow(data,2);
            					if (string[p]=="sqrt")
            						data=Math.sqrt(data);
            				}
            				data = Math.sin(data);
            				String dataString = String.valueOf(data);
            				string[j]=dataString;
            				for (int m=j+1;m<count-(save-j);m++)
            					string[m]=string[m+save-j+1];
            				count=count-(save-j+1);
            				i=i-(save-j+1);
            			}
            			if (string[j]=="cos"){
            				int p=j+1;//p是用来记录第一个得到的数字的数组位置
            				while (string[p]=="sin"||string[p]=="cos"||string[p]=="ln"||string[p]=="sqr"||string[p]=="sqrt")
            					p++;
            				double data = Double.parseDouble(string[p]);
            				p--;
            				int save=p;
            				for (;p>j;p--){
            					if (string[p]=="sin")
            						data=Math.sin(data);
            					if (string[p]=="cos")
            						data=Math.cos(data);
            					if (string[p]=="ln")
            						data=Math.log(data);
            					if (string[p]=="sqr")
            						data=Math.pow(data,2);
            					if (string[p]=="sqrt")
            						data=Math.sqrt(data);
            				}
            				data = Math.cos(data);
            				String dataString = String.valueOf(data);
            				string[j]=dataString;
            				for (int m=j+1;m<count-(save-j);m++)
            					string[m]=string[m+save-j+1];
            				count=count-(save-j+1);
            				i=i-(save-j+1);
            			}
            			if (string[j]=="sqr"){
            				int p=j+1;//p是用来记录第一个得到的数字的数组位置
            				while (string[p]=="sin"||string[p]=="cos"||string[p]=="ln"||string[p]=="sqr"||string[p]=="sqrt")
            					p++;
            				double data = Double.parseDouble(string[p]);
            				p--;
            				int save=p;
            				for (;p>j;p--){
            					if (string[p]=="sin")
            						data=Math.sin(data);
            					if (string[p]=="cos")
            						data=Math.cos(data);
            					if (string[p]=="ln")
            						data=Math.log(data);
            					if (string[p]=="sqr")
            						data=Math.pow(data,2);
            					if (string[p]=="sqrt")
            						data=Math.sqrt(data);
            				}
            				data = Math.pow(data,2);
            				String dataString = String.valueOf(data);
            				string[j]=dataString;
            				for (int m=j+1;m<count-(save-j);m++)
            					string[m]=string[m+save-j+1];
            				count=count-(save-j+1);