From your chapter 2 of Java How To Program question 2.14

[allenbangai]

Write an application that displays the numbers 1 to 4 on the same line, with each pair of
adjacent numbers separated by one space. Use the following techniques:
a) Use one System.out.println statement.
b) Use four System.out.print statements.
c) Use one System.out.printf statement.

Note that this issue is no less a biginner issue and is just to warm up biginners.