使用換行符將字串中的行限制為60個字符

該程式旨在從字串中洗掉雙倍、三倍...空格并將字符限制為每行 60 個。

問題是當它必須跳過它們時，它會將單詞放入第 60 個位置的行中。

輸出是：

Java was originally developed by James Gosling at Sun Microsystems
(which has since been acquired by Oracle) and released in 1995
as a core component of Sun Microsystems' Java platform.

但正確的輸出必須是：

Java was originally developed by James Gosling at Sun
Microsystems (which has since been acquired by Oracle) and
released in 1995 as a core component of Sun Microsystems'
Java platform.

到目前為止我的代碼：

      StringBuilder sb = new StringBuilder(text.replaceAll("(^ )|( $)", "").replaceAll("\\s{2,}", " "));
       int i = 0;
       while ((i = sb.indexOf(" ", i   60)) != -1) {
           sb.replace(i,i 1,"\n");
       }
       String result = sb.toString();
       return result;
   }

uj5u.com熱心網友回復：

這是我第 24 次測驗運行的結果。

Java was originally developed by James Gosling at Sun Microsystems
(which has since been acquired by Oracle) and released in 1995
as a core component of Sun Microsystems'   Java platform.

Java was originally developed by James Gosling at Sun
Microsystems (which has since been acquired by Oracle) and
released in 1995 as a core component of Sun Microsystems'
Java platform.

第一段是輸入。第二段是輸出。

看一下代碼。你看到幾個注釋掉的System.out.println陳述句嗎？這就是您發現代碼問題的方式。您撰寫幾行代碼，然后列印中間結果。沖洗并重復，直到您的代碼有效。

這是完整的可運行代碼。

public class FixedLengthLines {

    public static void main(String[] args) {
        new FixedLengthLines().processString();
    }
    
    public void processString() {
        String text = "Java was originally developed by James Gosling at Sun Microsystems\r\n"   
                "(which has since been acquired by Oracle) and released in 1995\r\n"   
                "as a core component of Sun Microsystems'   Java platform.";
        String temp = text.replaceAll("\\s{2,}", " ");
//      System.out.println(temp);
        
        int lineLength = 60;
        int lineIndex = 0;
        int endIndex = Math.min(lineIndex   lineLength, temp.length());
        StringBuilder builder = new StringBuilder();
        
        while (lineIndex < endIndex) {
//          System.out.println(lineIndex   " "   endIndex   " "   temp.length());
            
            if (endIndex >= lineIndex   lineLength) {
                endIndex = temp.lastIndexOf(" ", endIndex); 
            }
            
            builder.append(temp.substring(lineIndex, endIndex));
            builder.append(System.lineSeparator());
            
//          System.out.println(endIndex   " "   temp.substring(lineIndex, endIndex));
            
            lineIndex = endIndex   1;
            endIndex = Math.min(lineIndex   lineLength, temp.length());
        }
        
        System.out.println(text);
        System.out.println();
        System.out.println(builder.toString());
    }

}

uj5u.com熱心網友回復：

干得好。更換后。效率不高，但應該能解決問題。

    int pos = 0;
    StringBuilder stringBuilder = new StringBuilder(text);
    String finalText = recursiveBuild(stringBuilder,  pos).toString();
    System.out.println(finalText);
}

private static StringBuilder recursiveBuild(StringBuilder stringBuilder, int pos) {
    if (pos 60<stringBuilder.length()){
        if (pos == 0) pos =60;
        int tempPos = stringBuilder.substring(0, pos).lastIndexOf(" ");
        stringBuilder.delete(tempPos, tempPos 1).insert(tempPos, "\n");
        stringBuilder = recursiveBuild(stringBuilder, tempPos 60);
    } else {
        int tempPos = stringBuilder.substring(0, pos).lastIndexOf(" ");
        stringBuilder.delete(tempPos, tempPos 1).insert(tempPos, "\n");
    }
    return stringBuilder;
}

只適用于

        String text = "Java was originally developed by James Gosling at Sun Microsystems (which has since been acquired by Oracle) and released in 1995 as a core component of Sun Microsystems' Java platform.";

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