JAVA Variable declaration not allowed at this location [duplicate]

I want to declare a variable called false that takes a boolean as an argument, all of this within a function.All this in JAVA

function typeOfBooleanFalse() {    let false= 5>6;  }

I made a similar one that worked=

function typeOfBooleanTrue() {    let verdadero= 5<6;}

I don't know where the difference is