java - java中的字符串格式化函数

Question

我正在编写一个函数来格式化字符串输入。作用是使文本输出左缩进，并限制一行字符数。如果单词之间有多余的空格“”；我跳过多余的空格，只放一个空格' '。如果单词太长并且将超过每行字符限制，我会插入空格直到限制，并在换行符中使用该单词开始新行。

我无法创建代码的填充部分。这是检查单词是否超出限制并以换行符中的单词开始换行的部分。

作为作业要求的一部分，我只允许在字符串上使用 charAt() 和 length 方法

 void runApp(){
     String text = "          Knowing You Jesus        " +
                "                                         Graham Kendrick " +
                "All I once held dear,     built my life upon " +
                "All this world reveres,    and wars to own " +
                "All I once thought gain      I have counted loss " +
                "Spent and worthless now, compared         to this " +
                "Knowing you,       Jesus " +
                "Knowing you, there is          no greater thing " +
                "You're my all, you're the best " +
                "You're my joy, my righteousness " +
                "And I love you, Lord " +
                "Now my heart's desire is to know you more " +
                "To be found in you and known as yours " +
                "To possess by faith what I could not earn " +
                "All-surpassing gift of righteousness " +
                "Oh, to know the    power of your risen life " +
                "And to know You in Your sufferings " +
                "To become like you in           your death, my Lord " +
                "So with you to         live and never die " +
                "Source:  Musixmatch " +
                "Songwriters:  Tim Hughes  /  Ben Cantelon   ";

    //limit = 60
        System.out.println(" `123456789012345678901234567890123456789012345678901234567890");`
        System.out.println(leftTextFormat(text, 60));
        System.out.println();
    }


// This prints out everything left indented, but does not pad.
String leftTextFormat(String text, int limit){
    String formattedText = "";
    int charCount = 0;
    formattedText = formattedText+"[";
    for (int i=0; i<text.length(); i++){
        if (charCount%limit ==0){
            if (text.charAt(i) == ' '){
                continue;
            }else if (text.charAt(i) != ' ' ){
                formattedText = formattedText+text.charAt(i);
                charCount++;
            }
        }else if (charCount%limit != 0){
            if (text.charAt(i) == ' '){
                if (text.charAt(i-1) != ' '){
                    formattedText = formattedText+text.charAt(i);
                    charCount++;
                }else{
                    continue;
                }
            }else if (text.charAt(i) != ' '){
                formattedText = formattedText+text.charAt(i);
                charCount++;
            }
        }
        if (charCount%limit ==0 && charCount!=0){
            formattedText = formattedText+"]\n[";
        }
    }
    return formattedText;
}

预期输出是这样的: https://drive.google.com/file/d/1uYXtSBo37sFnpwJeBGtjF0MFYNngtZXv/view?usp=sharing

我设法做到的是: https://drive.google.com/file/d/102zNMe4JhaO2IUoOPCS5GSZ02Pq9aXwX/view?usp=sharing

 123456789012345678901234567890123456789012345678901234567890
[Knowing You Jesus Graham Kendrick All I once held dear, buil]
[t my life upon All this world reveres, and wars to own All I]
[once thought gain I have counted loss Spent and worthless no]
[w, compared to this Knowing you, Jesus Knowing you, there is]
[no greater thing You're my all, you're the best You're my jo]
[y, my righteousness And I love you, Lord Now my heart's desi]
[re is to know you more To be found in you and known as yours]
[To possess by faith what I could not earn All-surpassing gif]
[t of righteousness Oh, to know the power of your risen life ]
[And to know You in Your sufferings To become like you in you]
[r death, my Lord So with you to live and never die Source: M]
[usixmatch Songwriters: Tim Hughes / Ben Cantelon 

Answer 1

好的尝试，但你的问题是你只添加字符，而从未真正确定这些字符是否组成单词，以及你添加的这些单词是否会超出你的“限制”。因此，您不知道什么时候某个单词实际上会导致您超出您施加的限制，因此当您可能会超出该限制时，您不会尝试填充您的行。

本质上，您需要逐字逐行地工作。每次建立一个单词时，请检查该单词的长度加上当前行的长度是否不超过您的限制。如果它更大，请不要将其连接到当前行，而是将该行填充到限制并开始新行。

public String formattedLine(String singleLine, int limit) {
    int padding = limit - singleLine.length();
    String pad ="";
    for(int j = 0; j < padding; j ++) {
        pad += " ";
    }
    return  "[" + singleLine + pad + "]\n";
}

public String leftTextFormat(String text, int limit) {
    String word = "";
    String singleLine = "";
    String formattedText = "";
    for(int i=0; i<text.length(); i++) {
        if (text.charAt(i) != ' ') {
            word = word + text.charAt(i);
        } else {
            if(word.length() > 0) {
                if(singleLine.length() + word.length() >= limit) {
                  formattedText = formattedText + formattedLine(singleLine, limit);
                  singleLine = "";
                }
                if(singleLine.length() == 0) {
                    singleLine = word;
                } else {
                    singleLine = singleLine + " " + word;
                }
                word = "";
            }
        }
    }
    formattedText = formattedText + formattedLine(singleLine, limit);
    return formattedText;
}