Java

Print string without changing a new line

class Output
{
	public static void main(String args[])
	{
		System.out.print("Hello ");// not change a new line
		System.out.print("World!\n");
	}
}

Print string with changing a new line

class Output
{
	public static void main(String args[])
	{
		System.out.println("Hello ");
		System.out.println("World!");
	}
}

printf and format are equivalent

class Output
{
	public static void main(String args[])
	{
		//Decimal
		System.out.printf("%d%n", 10000);// print an integer
		System.out.printf("%10d%n", 10000);// print an integer with width 10, defalut is right-justified
		System.out.printf("%-10d%n", 10000);// left-justified
		System.out.printf("%,10d%n", 10000);// locale-specific grouping characters

		//Float
		System.out.printf("%f%n", Math.PI);// print a float number
		System.out.printf("%10.2f%n", Math.PI);// print a float number with width 10 and 2 significant figure
		System.out.printf("%-10.2f%n", Math.PI);// left-justified
		System.out.printf("%e%n", 12345678.0);// print a float number in exponential notation
		System.out.printf("%g%n", 12345678.0);// print a float number in either the floating-point format f or the exponential format e based on the magnitude of the value
		System.out.printf("%a%n", 12345678.0);// print a float number in hexadecimal format

		//Octal
		System.out.printf("%o%n", 10);

		//Hexadecimal
		System.out.format("%x%n", 10);

		//Character
		System.out.format("%c%n", 'A');

		//String
		System.out.format("%s%n", "String");
	}
}

import java.util.Calendar;

class Output
{
	public static void main(String args[])
	{
		Calendar c = Calendar.getInstance();

		// Date/Time Compositions
		System.out.format("%tc%n", c);// tc, date
		System.out.format("%tF%n", c);// tF, date
		System.out.format("%tr%n", c);// tr
		System.out.format("%tT%n", c);// tT

		//Date
		System.out.format("%1$tA, %1$tB %1$td, %1$tY%n", c);// argument index to indicate all format specifiers use the first argument

		//Time
		System.out.format("%1$tH:%1$tM:%1$tS%n", c);
	}
}

class Output
{
	public static void main(String args[])
	{
		System.out.format("%b%n", false);// boolean
		System.out.format("%h%n", "Hello");// hash code
		System.out.format("%%%n");// %
		System.out.format("%n");// new line
	}
}

class Output
{
	public static void main(String args[])
	{
		System.out.format("%4$s %3$s %2$s %1$s%n", "One", "Two", "Three", "Four");
	}
}

\', single quote
\", double quote
\\, backslash character
\b, backspace
\f, new page
\n, new line
\r, carriage return
\t, horizontal tab

import java.text.DecimalFormat;

public class Output{

   static public void customFormat(String pattern, double value ) {
      DecimalFormat myFormatter = new DecimalFormat(pattern);
      String output = myFormatter.format(value);
      System.out.println(value + "  " + pattern + "  " + output);
   }

   static public void main(String[] args) {

      customFormat("###,###.###", 123456.789);
      customFormat("###.##", 123456.789);
      customFormat("000000.000", 123.78);
      customFormat("$###,###.###", 12345.67);
   }
}