如何在java中对齐换行符？

Question

Is there any way to align the very long text?

For example of this code:

System.out.println("\tHi this is a very long string to test the automated newline but I want to have the newline to be tab indented too.");

Instead of having below

    Hi this is a very long string to test the automated newline but I want to 
have the newline to be tab indented too.

I want this

    Hi this is a very long string to test the automated newline but I want to 
    have the newline to be tab indented too.

So, I want the newline to be aligned with the first sentence. Is there any library exist out there or default String Java method?

Answer 1

在print语句中使用（“\\ t”+“嗨，这是换行符”）

Answer 2

Could you show us the code you're using? You would probably want \\t on both lines if you want them both aligned and tabbed.

Answer 3

In short, no. The width of the console can vary from execution to execution, and Java simply doesn't make that information available. However, you can probably assume that the minimum is 80 characters and just wrap it manually at 80 characters. See this question .

Answer 4

I don't believe there is a built-in method in the JDK for doing this.

The best solution I'm aware of is to use WordUtils.wrap(String str, int wrapLength, String newLineStr, boolean wrapLongWords) which is part of Apache Commons Lang .

This method allows you to specify the number of columns at which to wrap as well as your newline character. You could use \\n\\t as your newline which should wrap the line and then tab indent the next line as you've asked.

Example:

import org.apache.commons.lang3.text.WordUtils;

public class Demo
{
    public static void main(String[] args)
    {
        String longString = "\tThe quick brown fox jumps over the fence";
        System.out.println(WordUtils.wrap(longString, 10, "\n\t", false));
    }

} 

-- Edit --

The Commons Lang library might be too large to include with an Android application. However, the source code for WordUtils.wrap(...) is readily available so you could always create your own stripped-down version of WordUtils .

Answer 5

There's no direct way of achieving word-wrapping through String API. You would have to come up with a utility method of your own. Here's a simple implementation that wraps the String input at the specified lineSize .

void printWordWrapped(String string, int lineSize) {
    int len = (len = string.length()) > lineSize ? lineSize : len;
    do {
        System.out.printf("\t%s\n", string.substring(0, len).trim());
        string = string.substring(len);
        len = (len = string.length()) > lineSize ? lineSize : len;
    } while (len > 0);
}

printWordWrapped("Hi this is a short string.", 30);
System.out.println();
printWordWrapped("Hi this is a very long string to test " +
                 "the automated newline but I want to have " + 
                 "the newline to be tab indented too.", 30);

Output :

    Hi this is a short string.

    Hi this is a very long string
    to test the automated newline
    but I want to have the newline
    to be tab indented too.