How to print a table in Java?

In Java, you can use string formatting and loops to print a table. Here is a simple example:

public class TablePrinter {
    public static void main(String[] args) {
        String[][] data = {
            {"Name", "Age", "Gender"},
            {"John", "25", "Male"},
            {"Alice", "30", "Female"},
            {"Bob", "18", "Male"}
        };

        // 计算每列的最大宽度
        int[] columnWidths = new int[data[0].length];
        for (String[] row : data) {
            for (int i = 0; i < row.length; i++) {
                if (row[i].length() > columnWidths[i]) {
                    columnWidths[i] = row[i].length();
                }
            }
        }

        // 打印表头
        for (int i = 0; i < data[0].length; i++) {
            System.out.format("%-" + columnWidths[i] + "s", data[0][i]);
            System.out.print(" | ");
        }
        System.out.println();

        // 打印分隔线
        for (int i = 0; i < columnWidths.length; i++) {
            for (int j = 0; j < columnWidths[i] + 3; j++) {
                System.out.print("-");
            }
        }
        System.out.println();

        // 打印数据行
        for (int i = 1; i < data.length; i++) {
            for (int j = 0; j < data[i].length; j++) {
                System.out.format("%-" + columnWidths[j] + "s", data[i][j]);
                System.out.print(" | ");
            }
            System.out.println();
        }
    }
}

The above code first defines a two-dimensional string array named data, which contains the data of the table. Then, it calculates the maximum width of each column through a loop and stores it in the columnWidths array. Next, it uses a loop to print the table header, separating lines, and data rows.

The output is as follows:

Name  | Age | Gender
------|-----|-------
John  | 25  | Male  
Alice | 30  | Female
Bob   | 18  | Male  

By adjusting the data in the array, different tables can be printed.