what is
juxtaposition?
synonymous with contrast, two objects or texts that oppose one another
but according with Mr. Radzi said, juxtaposition can be defined as placing two variable, side by side and their contrast or similarity are shown through comparison.
the analogy using metaphor or similes.

the example of metaphor is "
life is a box of chocolate, you will never know what you will get"
and the example of similes is "
life is like a maze in which you try to avoid the exit"