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