private <T extends Object> String prettyPrintCharsPerLine(T item, int numberOfCharsPerLine) {
        // initialize a mutable string
	StringBuffer pretty = new StringBuffer(item.toString());
		
	// now insert a line break at every point necessary
	// the break comes after the numberOfCharsPerLine 
	int pos = numberOfCharsPerLine;
	while (pos < pretty.length()) {
		pretty.insert(pos+1, '\n');
		pos += numberOfCharsPerLine;
	}
		
	return pretty.toString();
}

private <T extends Object> String prettyPrintCharsPerLine(T item, int numberOfCharsPerLine) {
		// initialize a mutable string
		StringBuffer pretty = new StringBuffer(item.toString());
		
		// now insert a line break at every point necessary
		// the break comes after the numberOfCharsPerLine 
		int pos = numberOfCharsPerLine;
		while (pos < pretty.length()) {
			pretty.insert(pos+1, '\n');
			pos += numberOfCharsPerLine;
		}
		
		return pretty.toString();
}

Generic method for printing a list to the console based on the number of characters per line.

Generic pretty print based on chars per line

java, line

Java