15、骂战

第(3/3)页

blicstaticstringcomputestring(stringstring){

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        stringregexcheck=“[\\(\\)\\d\\+\\-\\*/\\.]*“;//是否是合法的表达式

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        if(!pattern.matches(regexcheck，string))

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        returnstring;

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        matchermatcher=null;

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        stringtemp=““;

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        intindex=-1;

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        stringregex=“\\([\\d\\.\\+\\-\\*/]+\\)“;//提取括号表达式

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        string=string.replaceall(“\\s“，““);//去除空格

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        try{

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        patternpattern=pattern.compile(regex);

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        //循环计算所有括号里的表达式

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        while(pattern.matcher(string).find()){

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        matcher=pattern.matcher(string);

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        while(matcher.find()){

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        temp=matcher.group();

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        index=string.indexof(temp);

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        string=string.substring(0，index)

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        +computestirngnobracket(temp)

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        +string.substring(index+temp.length());

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        }

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        }

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        //最后计算总的表达式结果

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        string=computestirngnobracket(string);

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        }catch(numberformatexceptione){

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        returne.getmessage();

        (未完待续。)
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