System.out.println分隔字符串中的行

Question

I want to create cells for this spread sheet. The thing is for my toString() method, I created a variable ret and I'm adding onto it. The problem I'm having is how do I add a System.out.println(); to ret? I'm coding the spread sheet line by line using for loops but once I'm done with printing the first line, the second line that I want to print after the first line on a seperate line is being printed on the first line because I'm not sure how to ret += System.out.println();

How do i seperate the two lines?

This is part of my code:

String ret = "";
String alph = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
ret += ("             |");

for (int i = 0; i < rows; i ++) {
    ret += ("      " + alph.charAt(i) + "      |");
}

System.out.println();
ret += ("-------------+");

for (int i = 0; i < rows; i ++) {
    ret += ("-------------+");
}

Answer 1

String ret = "";
    String alph = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    ret += ("             |");
    for (int i = 0; i < rows; i ++) {
        ret += ("      " + alph.charAt(i) + "      |");
    }
   ret += "\n";
    ret += ("-------------+");
    for (int i = 0; i < rows; i ++) {
        ret += ("-------------+");
    }

Answer 2

Where you want the line break to be, you need to add a new line character. This may be \\n or \\r\\n depending on the operating system. You can also use System.getProperty("line.separator") to determine the correct new line character.

ret += System.getProperty("line.separator");

Answer 3

Add a newline character '\\n' to the string.

Replace this:

System.out.println();

with this:

ret += "\n";

When it gets printed, a newline character starts a new line (hence the name). They're also used in text files to separate lines.