Java Console Output

Display text (and spaces/numbers/symbols):

System.out.println("Hello World 123 @$%#.,");

- To display multiple print commands on the same line, use "print" instead of "println"

Arrange text (tab, new line):

System.out.println("Hello \t World \n Testing");

- "\t" will tab "world" to the right

- "\n" will put the text following it onto a new line

Display calculated values:

System.out.println(12+34); // This will display: 46

- With calculations you don't use quotes, otherwise it will display the calculation numbers "12+34" rather than the answer

Display both text and calculated values:

System.out.println("Hello world " + (12+34)); // This will display: Hello World 46

- If the calculation isn't in parenthesis, it will display the numbers as 1234, rather than the answer 46

Display a value with 2 decimal places:

System.out.println( String.format("%.2f", 14f) ); // This will display 14.00

- The f is not needed after the value being displayed if it is already a decimal, such as 14.4567

- You can display to another number of decimals places, just change the number after %.

- To display a large number separated by commas (e.g. 23,661,523), put a comma after the '%' (e.g. "%,.2f").

- Alternatively you can use 'System.out.printf("%.2f", ___ )'

Have content take up a fixed amount of space

System.out.println( String.format("%-12.12s", "Name") ); // This will take up 12 spaces

- This is useful if you have another value on the same line and want it to be a fixed distance from the left side

- Use this if you have multiple lines containing words/numbers of varying length that you want to line up in columns

- The number to the left of the point specifies the minimum amount of space to fill (padding is added after short words)

- The number to the right of the point specifies the maximum amount of space to fill (longer words are cut short)

- If the maximum amount is not needed, remove both the point and the number on the right (e.g. leaving "%-12s")

Display content aligned to the right

System.out.println( String.format("%12s", "hi") ); // This will align to a point 12 spaces right

Challenge

Write a program that will display the following on a line (where the blank lines should show the actual answers calculated by the program, <tab> is replaced by a real position tab, and the numbers are shown to the 3rd decimal): The square root of 134 is ___, <tab> also 13^4 = ___.

Quiz

Completed