Java 将字符串拆分为多行

Question

我正在制作一个带有文本框的小游戏。文本框将绘制一个字符串，该字符串将分成多行以适合文本框。 "separating into multiple lines" 部分有点问题。

String[] line = new String[4];
int boxWidth = 200;
String MESSAGE = "This is a long message to make sure that the line separation works.";
String[] splitArray = null;

try {
    splitArray = MESSAGE.split("\s+"); //split the words of the sentence into an array
} catch (PatternSyntaxException e) {
    CrashDumping.DumpCrash(e);
}

String cursentence = "";
int curleng = 0;
int curline = 0;
for (int i = 0; i < splitArray.length; i++) {
    if (curleng + m.getStringWidth(splitArray[i], r.font1) <= boxWidth) {
        curleng += m.getStringWidth(splitArray[i], r.font1);
        cursentence += splitArray[i]; cursentence += " ";
    } else {
        line[curline] = cursentence;
        cursentence = "";
        curline++;
        curleng = 0;
    }
}
for (int i = 0; i < line.length; i++) {
    System.out.println("Line " + i + " - " + line[i]);
}

int getStringWidth(String sentence, Font font) 是我写的一种方法，它 return 字符串宽度（以像素为单位）。这个方法有效；这不是问题。

public int getStringWidth(String text, Font font) {
    AffineTransform affinetransform = new AffineTransform();
    FontRenderContext frc = new FontRenderContext(affinetransform,true,true);
    return (int)(font.getStringBounds(text, frc).getWidth());
}

输出应如下所示：

Line 0 - This is a long message to make sure 
Line 1 - that the line separation works.
Line 2 - null
Line 3 - null

但只会打印出第一行，后三行为空。因此，出于某种原因，for 循环在完成第一行后中断。

这是怎么回事？

Answer 1

仅当您的当前行已满时才分配 line[curline] = cursentence;。但是在 for 循环完成后你不会进行赋值，这意味着当你运行词穷时你的剩余部分会丢失。在 for 循环下添加此代码块：

if (!"".equals(cursentence)) {
    line[curline] = cursentence;
}

正如@rodrigoap 所说，您还需要用第一行不适合的单词开始新行，该单词进入 else 块而不是 cursentence = "";

cursentence = splitArray[i];

Java 将字符串拆分为多行

Java split string into multiple lines

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