import java.util.*;

class Point {
    int x, y;
    Point(int x, int y) {
        this.x = x;
        this.y = y;
    }
}

public class StringFormatting {
    public static void main(String[] args) {
        // Java offers several ways to format strings. Here are some examples
        // of common string formatting tasks.

        // In Java, we use the String.format() method or System.out.printf()
        // for formatting. This prints an instance of our Point class.
        Point p = new Point(1, 2);
        System.out.printf("struct1: %s%n", p);

        // In Java, we don't have direct equivalents to Go's %+v or %#v.
        // We can achieve similar results by overriding toString() in our class.
        System.out.printf("struct2: %s%n", p);

        // To print the type of a value, we use getClass().getName()
        System.out.printf("type: %s%n", p.getClass().getName());

        // Formatting booleans is straightforward.
        System.out.printf("bool: %b%n", true);

        // There are many options for formatting integers.
        // Use %d for standard, base-10 formatting.
        System.out.printf("int: %d%n", 123);

        // This prints a binary representation.
        System.out.printf("bin: %s%n", Integer.toBinaryString(14));

        // This prints the character corresponding to the given integer.
        System.out.printf("char: %c%n", 33);

        // %x provides hex encoding.
        System.out.printf("hex: %x%n", 456);

        // There are also several formatting options for floats.
        // For basic decimal formatting use %f.
        System.out.printf("float1: %f%n", 78.9);

        // %e and %E format the float in (slightly different versions of) scientific notation.
        System.out.printf("float2: %e%n", 123400000.0);
        System.out.printf("float3: %E%n", 123400000.0);

        // For basic string printing use %s.
        System.out.printf("str1: %s%n", "\"string\"");

        // To double-quote strings, we can use %s with quotes in the format string.
        System.out.printf("str2: \"%s\"%n", "string");

        // As with integers seen earlier, we can use String.format() with %x 
        // to render the string in base-16.
        System.out.printf("str3: %s%n", String.format("%x", "hex this"));

        // To print a representation of a pointer, we can use System.identityHashCode().
        System.out.printf("pointer: %d%n", System.identityHashCode(p));

        // When formatting numbers you will often want to control the width and precision 
        // of the resulting figure. To specify the width of an integer, use a number 
        // after the % in the format specifier. By default the result will be right-justified 
        // and padded with spaces.
        System.out.printf("width1: |%6d|%6d|%n", 12, 345);

        // You can also specify the width of printed floats, though usually you'll also want 
        // to restrict the decimal precision at the same time with the width.precision syntax.
        System.out.printf("width2: |%6.2f|%6.2f|%n", 1.2, 3.45);

        // To left-justify, use the - flag.
        System.out.printf("width3: |%-6.2f|%-6.2f|%n", 1.2, 3.45);

        // You may also want to control width when formatting strings, especially to ensure 
        // that they align in table-like output. For basic right-justified width.
        System.out.printf("width4: |%6s|%6s|%n", "foo", "b");

        // To left-justify use the - flag as with numbers.
        System.out.printf("width5: |%-6s|%-6s|%n", "foo", "b");

        // So far we've seen printf, which prints the formatted string to System.out. 
        // String.format() formats and returns a string without printing it anywhere.
        String s = String.format("sprintf: a %s", "string");
        System.out.println(s);

        // You can format+print to Writers other than System.out using PrintWriter or PrintStream.
        System.err.printf("io: an %s%n", "error");
    }
}