No there is no double jump in minecraft however you can sprint jump this can be done by first double pressing the W key and holding to sprint and then pressing space to jump and you will jump further
There are two ways that I'm aware of this being possible.
1) A Potion of Swiftness (correction if I'm wrong is welcome xD)
2) Building a pyramid and enabling the 'jump' buff.
Press the space button.
Press the spacebar
The default jump button is the space bar.
You need to press the ' Space ' key on the keyboard to jump.
Play minecraft
Yes press spacebar.
You have to jump off something and jump again while in midair which will activate flight.
walk and jump
Right click the minecart.
Double tap the jump
Double tap the jump button.
FRFR
You double-tap the jump button quickly