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import java.util.Date;

/**
 * Using printf for output
 */
/** Key Technical Points
 * Using the printf method of java.io.PrintStream to achieve C-style output
 * The first parameter of the printf method is the output format, the second parameter is variable-length, representing the data objects to be output
 */
public class Printf {

    public static void main(String[] args) {
        /*** Output String ***/
        // %s indicates outputting a string, which replaces the %s in the pattern with the subsequent string
        System.out.printf("%s", new Integer(1212));
        // %n indicates a newline
        System.out.printf("%s%n", "end line");
        // Supports multiple parameters
        System.out.printf("%s = %s%n", "Name", "Zhangsan");
        // %S outputs the string in uppercase
        System.out.printf("%S = %s%n", "Name", "Zhangsan");
        // When supporting multiple parameters, variable numbers can be inserted between %s, 1$ indicates the first string, 3$ indicates the third string
        System.out.printf("%1$s = %3$s %2$s%n", "Name", "san", "Zhang");

        /*** Output boolean type ***/
        System.out.printf("true = %b; false = ", true);
        System.out.printf("%b%n", false);

        /*** Output integer type ***/
        Integer iObj = 342;
        // %d formats the integer as a decimal integer
        System.out.printf("%d; %d; %d%n", -500, 2343L, iObj);
        // %o formats the integer as an octal integer
        System.out.printf("%o; %o; %o%n", -500, 2343L, iObj);
        // %x formats the integer as a hexadecimal integer
        System.out.printf("%x; %x; %x%n", -500, 2343L, iObj);
        // %X formats the integer as a hexadecimal integer, with uppercase letters
        System.out.printf("%X; %X; %X%n", -500, 2343L, iObj);

        /*** Output floating-point type ***/
        Double dObj = 45.6d;
        // %e outputs the floating-point number in scientific notation
        System.out.printf("%e; %e; %e%n", -756.403f, 7464.232641d, dObj);
        // %E outputs the floating-point number in scientific notation, with uppercase E
        System.out.printf("%E; %E; %E%n", -756.403f, 7464.232641d, dObj);
        // %f outputs the floating-point number in decimal format
        System.out.printf("%f; %f; %f%n", -756.403f, 7464.232641d, dObj);
        // Can also limit the number of decimal places
        System.out.printf("%.1f; %.3f; %f%n", -756.403f, 7464.232641d, dObj);

        /*** Output date type ***/
        // %t is used to format date and time types, %T is the uppercase form of date and time, followed by specific letters for different output formats
        Date date = new Date();
        long dataL = date.getTime();
        // Format year-month-day
        // %t followed by y for the year in 2 digits, m for the month, d for the day
        System.out.printf("%1$ty-%1$tm-%1$td; %2$ty-%2$tm-%2$td%n", date, dataL);
        // %t followed by Y for the year in 4 digits,
        // %t followed by B for the full month name, b for the abbreviated month name
        System.out.printf("%1$tY-%1$tB-%1$td; %2$tY-%2$tb-%2$td%n", date, dataL);

        // Common date combinations
        // %t followed by D to format the date as "%tm/%td/%ty"
        System.out.printf("%1$tD%n", date);
        // %t followed by F to format the date as "%tY-%tm-%td"
        System.out.printf("%1$tF%n", date);

        /*** Output time type ***/
        // Output hour-minute-second
        // %t followed by H for the hour in 24-hour format, I for the hour in 12-hour format,
        // %t followed by M for minutes, S for seconds
        System.out.printf("%1$tH:%1$tM:%1$tS; %2$tI:%2$tM:%2$tS%n", date, dataL);
        // %t followed by L for milliseconds in the second
        System.out.printf("%1$tH:%1$tM:%1$tS %1$tL%n", date);
        // %t followed by p for AM/PM information
        System.out.printf("%1$tH:%1$tM:%1$tS %1$tL %1$tp%n", date);

        // Common time combinations
        // %t followed by R to format the time as "%tH:%tM"
        System.out.printf("%1$tR%n", date);
        // %t followed by T to format the time as "%tH:%tM:%tS"
        System.out.printf("%1$tT%n", date);
        // %t followed by r to format the time as "%tI:%tM:%tS %Tp"
        System.out.printf("%1$tr%n", date);

        /*** Output day of the week ***/
        // %t followed by A for the full name of the day of the week
        System.out.printf("%1$tF %1$tA%n", date);
        // %t followed by a for the abbreviated name of the day of the week
        System.out.printf("%1$tF %1$ta%n", date);

        // Output full date and time information
        System.out.printf("%1$tc%n", date);
    }
}
/**
 * In the printf method, the format "%s" indicates outputting the first parameter of the second variable-length parameter as a string;
 * The format "%n" indicates a newline; the format "%S" indicates outputting the string in uppercase; between "%s", "n$" indicates
 * outputting the nth parameter of the variable-length parameter. The format "%b" indicates outputting the first parameter of the second variable-length parameter
 * as a boolean value.
 */
/**
 * The format "%d" indicates outputting in decimal integer format; "%o" indicates outputting in octal format; "%x" indicates outputting in hexadecimal
 * format; "%X" indicates outputting in hexadecimal format, with uppercase letters (A, B, C, D, E, F). The format "%e" indicates
 * outputting floating-point numbers in scientific notation; the format "%E" indicates outputting floating-point numbers in scientific notation, with the letter e in uppercase; the format
 * "%f" indicates outputting in decimal floating-point format, adding ".n" between "%f" to retain n decimal places.
 */
/**
 * The format "%t" indicates outputting date and time types. "%t" followed by y for the year in 2 digits, m
 * for the month, d for the day; "%t" followed by Y for the year in 4 digits,
 * B for the full month name, b for the abbreviated month name. "%t" followed by D
 * to format the date as "%tm/%td/%ty", F to format the date as "%tY-%tm-%td".
 */
/**
 * "%t" followed by H for the hour in 24-hour format, I for the hour in 12-hour format, M for minutes,
 * S for seconds, L for milliseconds in the second, p for AM/PM information. "%t" followed by R to format the time as "%tH:%tM", T to format the time as "%tH:%tM:%tS",
 * r to format the time as "%tI:%tM:%tS %Tp".
 */
/**
 * "%t" followed by A for the full name of the day of the week, a for the abbreviated name of the day of the week.
 */