java输出文本表格，类似于mysql命令行的结果集表格，如下所示：
+---------+------+--------+
| name | age | income |
+---------+------+--------+
| tom | 18 | 100 |
+---------+------+--------+
| cat | 26 | |
+---------+------+--------+
| 奥巴马儿 | 250 | 0 |
+---------+------+--------+
使用方法如下所示，new一个TextTable，传递header和行数据，调用toString方法输出即可：
public class TestMain {
public static void main(String[] args) {
String[] header = {"name", "age", "income"};
String[][] rows = {
{"tom", "18", "100"},
{"cat", "26", null},
{"奥巴马儿", "250", "0"}
};
System.out.println(new TextTable(header, rows));
}
}
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